Merge pull request #289 from evrardjp/update-README-for-1.6.0

Update README

.circleci/config.yml

@@ -1,26 +0,0 @@
-version: 2
-jobs:
-  build:
-    docker:
-      - image: cimg/go:1.13
-    steps:
-      - checkout
-      - setup_remote_docker
-      - deploy:
-          name: Build and push image
-          command: |
-            echo "$DOCKER_PASS" | docker login --username "$DOCKER_USER" --password-stdin
-            if [ -z "${CIRCLE_TAG}" ]; then
-                make publish-image
-            else
-                make VERSION="${CIRCLE_TAG}" publish-image
-            fi
-
-workflows:
-  version: 2
-  build:
-    jobs:
-     - build:
-         filters:
-           tags:
-             only: /.*/

.github/ct.yaml

@@ -0,0 +1,6 @@
+# See https://github.com/helm/chart-testing#configuration
+remote: origin
+chart-dirs:
+  - charts
+chart-repos: []
+helm-extra-args: --timeout 600s

.github/dependabot.yml

@@ -0,0 +1,17 @@
+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+  # Maintain dependencies for gomod
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    ignore:
+      - dependency-name: "k8s.io/api"
+      - dependency-name: "k8s.io/apimachinery"
+      - dependency-name: "k8s.io/client-go"
+      - dependency-name: "k8s.io/kubectl"

.github/kind-cluster-1.18.yaml

@@ -0,0 +1,13 @@
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+nodes:
+- role: control-plane
+  image: kindest/node:v1.18.8
+- role: control-plane
+  image: kindest/node:v1.18.8
+- role: control-plane
+  image: kindest/node:v1.18.8
+- role: worker
+  image: kindest/node:v1.18.8
+- role: worker
+  image: kindest/node:v1.18.8

.github/kind-cluster-1.19.yaml

@@ -0,0 +1,13 @@
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+nodes:
+- role: control-plane
+  image: kindest/node:v1.19.4
+- role: control-plane
+  image: kindest/node:v1.19.4
+- role: control-plane
+  image: kindest/node:v1.19.4
+- role: worker
+  image: kindest/node:v1.19.4
+- role: worker
+  image: kindest/node:v1.19.4

.github/kind-cluster-1.20.yaml

@@ -0,0 +1,13 @@
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+nodes:
+- role: control-plane
+  image: "kindest/node:v1.20.0"
+- role: control-plane
+  image: "kindest/node:v1.20.0"
+- role: control-plane
+  image: "kindest/node:v1.20.0"
+- role: worker
+  image: "kindest/node:v1.20.0"
+- role: worker
+  image: "kindest/node:v1.20.0"

.github/workflows/check-links.yaml

@@ -1,16 +0,0 @@
-name: "Check links"
-on: [pull_request, push]
-
-jobs:
-  docs:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v1
-    - name: Link Checker
-      id: lc
-      uses: peter-evans/link-checker@v1
-      with:
-        args: -r *.md *.yaml */*/*.go -x .cluster.local
-    - name: Fail if there were link errors
-      run: exit ${{ steps.lc.outputs.exit_code }}
-

.github/workflows/on-master-push-charts.yaml

@@ -0,0 +1,19 @@
+name: Publish helm chart
+on:
+  push:
+    branches:
+      - "master"
+    paths:
+      - "charts/**"
+
+jobs:
+  publish-helm-chart:
+    name: Publish latest chart
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Publish Helm chart
+        uses: stefanprodan/helm-gh-pages@master
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          charts_dir: charts

.github/workflows/on-master-push.yaml

@@ -0,0 +1,38 @@
+# We publish every merged commit in the form of an image
+# named kured:<branch>-<short tag>
+name: Push image of latest master
+on:
+  push:
+    branches:
+      - master
+jobs:
+  tag-scan-and-push-final-image:
+    name: "Build, scan, and publish tagged image"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+
+      - name: Find go version
+        run: |
+          GO_VERSION=$(awk '/^go/ {print $2};' go.mod)
+          echo "::set-output name=version::${GO_VERSION}"
+        id: awk_gomod
+
+      - name: Ensure go version
+        uses: actions/setup-go@v2
+        with:
+          go-version: "${{ steps.awk_gomod.outputs.version }}"
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME_WEAVEWORKSKUREDCI }}
+          password: ${{ secrets.DOCKERHUB_TOKEN_WEAVEWORKSKUREDCI }}
+
+      - name: Build image
+        run: |
+          make DH_ORG="${{ github.repository_owner }}" image
+
+      - name: Publish image
+        run: |
+          make DH_ORG="${{ github.repository_owner }}" publish-image

.github/workflows/on-pr-charts.yaml

@@ -0,0 +1,41 @@
+#This is just extra testing, for lint check, and basic installation
+#If those fail, no need to test the rest of the PR (github will cancel the rest of the builds)
+name: PR - charts
+on:
+  pull_request:
+    paths:
+      - "charts/**"
+jobs:
+  # We create two jobs (with a matrix) instead of one to make those parallel.
+  # We don't need to conditionally check if something has changed, due to github actions
+  # tackling that for us.
+  # Fail-fast ensures that if one of those matrix job fail, the other one gets cancelled.
+  test-chart:
+    name: Test helm chart
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        test-action:
+          - lint
+          - install
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: "0"
+
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.7
+
+      # Helm is already present in github actions, so do not re-install it
+      - name: Setup chart testing
+        uses: helm/chart-testing-action@v2.0.1
+
+      - name: Create default kind cluster
+        uses: helm/kind-action@v1.1.0
+        if: ${{ matrix.test-action == 'install' }}
+
+      - name: Run chart tests 
+        run: ct ${{ matrix.test-action }} --config .github/ct.yaml

.github/workflows/on-pr.yaml

@@ -0,0 +1,197 @@
+name: PR
+on:
+  pull_request:
+  push:
+
+jobs:
+  pr-shellcheck:
+    name: Lint bash code with shellcheck
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Run ShellCheck
+      uses: bewuethr/shellcheck-action@v2
+
+  pr-lint-code:
+    name: Lint golang code
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Find go version
+      run: |
+        GO_VERSION=$(awk '/^go/ {print $2};' go.mod)
+        echo "::set-output name=version::${GO_VERSION}"
+      id: awk_gomod
+    - name: Ensure go version
+      uses: actions/setup-go@v2
+      with:
+        go-version: "${{ steps.awk_gomod.outputs.version }}"
+    - name: Lint cmd folder
+      uses: Jerome1337/golint-action@v1.0.2
+      with:
+        golint-path: './cmd/...'
+    - name: Lint pkg folder
+      uses: Jerome1337/golint-action@v1.0.2
+      with:
+        golint-path: './pkg/...'
+
+  pr-check-docs-links:
+    name: Check docs for incorrect links
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Link Checker
+      id: lc
+      uses: peter-evans/link-checker@v1
+      with:
+        args: -r *.md *.yaml */*/*.go -x .cluster.local
+    - name: Fail if there were link errors
+      run: exit ${{ steps.lc.outputs.exit_code }}
+
+  # This should not be made a mandatory test
+  # It is only used to make us aware of any potential security failure, that
+  # should trigger a bump of the image in build/.
+  pr-vuln-scan:
+    name: Build image and scan it against known vulnerabilities
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Find go version
+        run: |
+          GO_VERSION=$(awk '/^go/ {print $2};' go.mod)
+          echo "::set-output name=version::${GO_VERSION}"
+        id: awk_gomod
+      - name: Ensure go version
+        uses: actions/setup-go@v2
+        with:
+          go-version: "${{ steps.awk_gomod.outputs.version }}"
+      - run: make DH_ORG="${{ github.repository_owner }}" VERSION="${{ github.sha }}" image
+      - uses: Azure/container-scan@v0
+        with:
+          image-name: docker.io/${{ github.repository_owner }}/kured:${{ github.sha }}
+
+  # If the PRs don't break the behaviour in the helm chart, we can simply publish the helm chart at the time of the release.
+  e2e-helm:
+    name: "Functional test of helm chart, e2e testing"
+    runs-on: ubuntu-latest
+    # only build with oldest and newest supported, it should be good enough.
+    strategy:
+      matrix:
+        kubernetes:
+          - "1.18"
+          - "1.20"
+    steps:
+      - uses: actions/checkout@v2
+      - name: Find go version
+        run: |
+          GO_VERSION=$(awk '/^go/ {print $2};' go.mod)
+          echo "::set-output name=version::${GO_VERSION}"
+        id: awk_gomod
+      - name: Ensure go version
+        uses: actions/setup-go@v2
+        with:
+          go-version: "${{ steps.awk_gomod.outputs.version }}"
+      - name: Build artifacts
+        run: |
+          make DH_ORG="${{ github.repository_owner }}" VERSION="${{ github.sha }}" image
+          make DH_ORG="${{ github.repository_owner }}" VERSION="${{ github.sha }}" helm-chart
+
+      - name: "Workaround 'Failed to attach 1 to compat systemd cgroup /actions_job/...' on gh actions"
+        run: |
+          sudo bash << EOF
+              cp /etc/docker/daemon.json /etc/docker/daemon.json.old
+              echo '{}' > /etc/docker/daemon.json
+              systemctl restart docker || journalctl --no-pager -n 500
+              systemctl status docker
+          EOF
+
+      # Default name for helm/kind-action kind clusters is "chart-testing"
+      - name: Create 5 node kind cluster
+        uses: helm/kind-action@master
+        with:
+          config: .github/kind-cluster-${{ matrix.kubernetes }}.yaml
+
+      - name: Preload previously built images onto kind cluster
+        run: kind load docker-image docker.io/${{ github.repository_owner }}/kured:${{ github.sha }} --name chart-testing
+
+      - name: Deploy kured on default namespace with its helm chart
+        run: |
+          # Documented in official helm doc to live on the edge
+          curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash
+          # Refresh bins
+          hash -r
+          helm install kured ./charts/kured/ --set configuration.period=1m
+          kubectl config set-context kind-chart-testing
+          kubectl get ds --all-namespaces
+          kubectl describe ds kured
+
+      - name: Ensure kured is ready
+        uses: nick-invision/retry@v2.4.0
+        with:
+          timeout_minutes: 10
+          max_attempts: 10
+          retry_wait_seconds: 60
+          # DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE should all be = 5
+          command: "kubectl get ds kured | grep -E 'kured.*5.*5.*5.*5.*5' "
+
+      - name: Create reboot sentinel files
+        run: |
+          ./tests/kind/create-reboot-sentinels.sh
+
+      - name: Follow reboot until success
+        env:
+          DEBUG: true
+        run: |
+          ./tests/kind/follow-coordinated-reboot.sh
+
+  # This workflow is useful when introducing new versions, to ensure our manifests
+  # still work (even if there might be no manifest 'code' change).
+  # The version used here is what hasn't been tested with the helm chart
+  deploy-manifests:
+    name: Deploy kured with current manifests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        kubernetes:
+          - 1.18
+    steps:
+      - uses: actions/checkout@v2
+      - name: Find go version
+        run: |
+          GO_VERSION=$(awk '/^go/ {print $2};' go.mod)
+          echo "::set-output name=version::${GO_VERSION}"
+        id: awk_gomod
+      - name: Ensure go version
+        uses: actions/setup-go@v2
+        with:
+          go-version: "${{ steps.awk_gomod.outputs.version }}"
+      - name: Build artifacts
+        run: |
+          make DH_ORG="${{ github.repository_owner }}" VERSION="${{ github.sha }}" image
+          make DH_ORG="${{ github.repository_owner }}" VERSION="${{ github.sha }}" manifest
+      - name: Workaround "Failed to attach 1 to compat systemd cgroup /actions_job/..." on gh actions
+        run: |
+          sudo bash << EOF
+              cp /etc/docker/daemon.json /etc/docker/daemon.json.old
+              echo '{}' > /etc/docker/daemon.json
+              systemctl restart docker || journalctl --no-pager -n 500
+              systemctl status docker
+          EOF
+      # Default name for helm/kind-action kind clusters is "chart-testing"
+      - name: Create kind cluster
+        uses: helm/kind-action@master
+        with:
+          config: .github/kind-cluster-${{ matrix.kubernetes }}.yaml
+      - name: Preload previously built images onto kind cluster
+        run: kind load docker-image docker.io/${{ github.repository_owner }}/kured:${{ github.sha }} --name chart-testing
+      - name: Install kured with kubectl
+        run: |
+          kubectl apply -f kured-rbac.yaml && kubectl apply -f kured-ds.yaml
+      - name: Ensure kured is ready
+        uses: nick-invision/retry@v2.4.0
+        with:
+          timeout_minutes: 10
+          max_attempts: 10
+          retry_wait_seconds: 60
+          # DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE should all be = to cluster_size
+          command: "kubectl get ds -n kube-system kured | grep -E 'kured.*5.*5.*5.*5.*5'"

.github/workflows/on-tag.yaml

@@ -0,0 +1,40 @@
+# when we add a tag to the repo, we should publish the kured image to a public repository
+# if it's safe.
+# It doesn't mean it's ready for release, but at least it's getting us started.
+# The next step is to have a PR with the helm chart, to bump the version of the image used
+name: Tag repo
+on:
+  push:
+    tags:
+      - "*"
+jobs:
+  tag-scan-and-push-final-image:
+    name: "Build, scan, and publish tagged image"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: Find go version
+        run: |
+          GO_VERSION=$(awk '/^go/ {print $2};' go.mod)
+          echo "::set-output name=version::${GO_VERSION}"
+        id: awk_gomod
+      - name: Ensure go version
+        uses: actions/setup-go@v2
+        with:
+          go-version: "${{ steps.awk_gomod.outputs.version }}"
+      - run: |
+          make DH_ORG="${{ github.repository_owner }}" VERSION="${GITHUB_REF#refs/tags/}" image
+
+      - uses: Azure/container-scan@v0
+        with:
+          image-name: docker.io/${{ github.repository_owner }}/kured:${GITHUB_REF#refs/tags/}
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME_WEAVEWORKSKUREDCI }}
+          password: ${{ secrets.DOCKERHUB_TOKEN_WEAVEWORKSKUREDCI }}
+
+      - name: Publish image
+        run: |
+          make DH_ORG="${{ github.repository_owner }}" VERSION="${GITHUB_REF#refs/tags/}" publish-image

.github/workflows/periodics-daily.yaml

@@ -0,0 +1,127 @@
+name: Daily jobs
+
+on:
+  schedule:
+  - cron: "30 1 * * *"
+
+jobs:
+  periodics-mark-stale:
+    name: Mark stale issues and PRs
+    runs-on: ubuntu-latest
+    steps:
+    # Stale by default waits for 60 days before marking PR/issues as stale, and closes them after 7 days.
+    # Do not expire the first issues that would allow the community to grow.
+    - uses: actions/stale@v3.0.14
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: 'This issue was automatically considered stale due to lack of activity. Please update it and/or join our slack channels to promote it, before it automatically closes (in 7 days).'
+        stale-pr-message: 'This PR was automatically considered stale due to lack of activity. Please refresh it and/or join our slack channels to highlight it, before it automatically closes (in 7 days).'
+        stale-issue-label: 'no-issue-activity'
+        stale-pr-label: 'no-pr-activity'
+        exempt-issue-labels: 'good-first-issue'
+
+  check-docs-links:
+    name: Check docs for incorrect links
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Link Checker
+      id: lc
+      uses: peter-evans/link-checker@v1
+      with:
+        args: -r *.md *.yaml */*/*.go -x .cluster.local
+    - name: Fail if there were link errors
+      run: exit ${{ steps.lc.outputs.exit_code }}
+
+  vuln-scan:
+    name: Build image and scan it against known vulnerabilities
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Find go version
+        run: |
+          GO_VERSION=$(awk '/^go/ {print $2};' go.mod)
+          echo "::set-output name=version::${GO_VERSION}"
+        id: awk_gomod
+      - name: Ensure go version
+        uses: actions/setup-go@v2
+        with:
+          go-version: "${{ steps.awk_gomod.outputs.version }}"
+      - run: make DH_ORG="${{ github.repository_owner }}" VERSION="${{ github.sha }}" image
+      - uses: Azure/container-scan@v0
+        with:
+          image-name: docker.io/${{ github.repository_owner }}/kured:${{ github.sha }}
+
+  deploy-helm:
+    name: Ensure a kubernetes change didn't break our code
+    runs-on: ubuntu-latest
+    # only build with oldest and newest supported, it should be good enough.
+    strategy:
+      matrix:
+        kubernetes:
+          - 1.18
+          - 1.19
+          - 1.20
+    steps:
+      - uses: actions/checkout@v2
+      - name: Find go version
+        run: |
+          GO_VERSION=$(awk '/^go/ {print $2};' go.mod)
+          echo "::set-output name=version::${GO_VERSION}"
+        id: awk_gomod
+      - name: Ensure go version
+        uses: actions/setup-go@v2
+        with:
+          go-version: "${{ steps.awk_gomod.outputs.version }}"
+      - name: Build artifacts
+        run: |
+          make DH_ORG="${{ github.repository_owner }}" VERSION="master" image
+          make DH_ORG="${{ github.repository_owner }}" VERSION="master" helm-chart
+
+      - name: "Workaround 'Failed to attach 1 to compat systemd cgroup /actions_job/...' on gh actions"
+        run: |
+          sudo bash << EOF
+              cp /etc/docker/daemon.json /etc/docker/daemon.json.old
+              echo '{}' > /etc/docker/daemon.json
+              systemctl restart docker || journalctl --no-pager -n 500
+              systemctl status docker
+          EOF
+
+      # Default name for helm/kind-action kind clusters is "chart-testing"
+      - name: Create 5 node kind cluster
+        uses: helm/kind-action@master
+        with:
+          config: .github/kind-cluster-${{ matrix.kubernetes }}.yaml
+
+      - name: Preload previously built images onto kind cluster
+        run: kind load docker-image docker.io/${{ github.repository_owner }}/kured:master --name chart-testing
+
+      - name: Deploy kured on default namespace with its helm chart
+        run: |
+          # Documented in official helm doc to live on the edge
+          curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash
+          # Refresh bins
+          hash -r
+          helm install kured ./charts/kured/ --set configuration.period=1m
+          kubectl config set-context kind-chart-testing
+          kubectl get ds --all-namespaces
+          kubectl describe ds kured
+
+      - name: Ensure kured is ready
+        uses: nick-invision/retry@v2.4.0
+        with:
+          timeout_minutes: 10
+          max_attempts: 10
+          retry_wait_seconds: 60
+          # DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE should all be = 5
+          command: "kubectl get ds kured | grep -E 'kured.*5.*5.*5.*5.*5' "
+
+      - name: Create reboot sentinel files
+        run: |
+          ./tests/kind/create-reboot-sentinels.sh
+
+      - name: Follow reboot until success
+        env:
+          DEBUG: true
+        run: |
+          ./tests/kind/follow-coordinated-reboot.sh

.gitignore

@@ -1,4 +1,3 @@
 cmd/kured/kured
-cmd/prom-active-alerts/prom-active-alerts
 vendor
 build

DEVELOPMENT.md

@@ -15,9 +15,8 @@ you are planning to contribute code.
 
 ## Updating k8s support
 
-Whenever we want to update e.g. [`kubectl` in the
-image](cmd/kured/Dockerfile), we need to consider if we update `client-go`
-as well, some RBAC changes might be necessary too.
+Whenever we want to update e.g. the `kubectl` or `client-go` dependencies,
+some RBAC changes might be necessary too.
 
 This is what it took to support Kubernetes 1.14:
 <https://github.com/weaveworks/kured/pull/75>
@@ -32,8 +31,8 @@ the main [README][readme] as well.
 
 Before `kured` is released, we want to make sure it still works fine on the
 previous, current and next minor version of Kubernetes (with respect to the
-embedded `client-go` & `kubectl`). For local testing e.g. `minikube` can be
-sufficient.
+embedded `client-go` & `kubectl`). For local testing e.g. `minikube` or
+`kind` can be sufficient.
 
 Deploy kured in your test scenario, make sure you pass the right `image`,
 update the e.g. `period` and `reboot-days` options, so you get immediate
@@ -48,8 +47,12 @@ sudo touch /var/run/reboot-required
 A test-run with `minikube` could look like this:
 
 ```console
+# start minikube
 minikube start --vm-driver kvm2 --kubernetes-version <k8s-release>
 
+# build kured image and publish to registry accessible by minikube
+make image minikube-publish
+
 # edit kured-ds.yaml to
 #   - point to new image
 #   - change e.g. period and reboot-days option for immediate results
@@ -58,6 +61,10 @@ minikube kubectl -- apply -f kured-rbac.yaml
 minikube kubectl -- apply -f kured-ds.yaml
 minikube kubectl -- logs daemonset.apps/kured -n kube-system -f
 
+# Alternatively use helm to install the chart
+# edit values-local.yaml to change any chart parameters
+helm install kured ./charts/kured --namespace kube-system -f ./charts/kured/values.minikube.yaml
+
 # In separate terminal
 minikube ssh
  sudo touch /var/run/reboot-required
@@ -75,32 +82,76 @@ If all the tests ran well, kured maintainers can reach out to the Weaveworks
 team to get an upcoming `kured` release tested in the Dev environment for
 real life testing.
 
+### Testing with `kind`
+
+A test-run with `kind` could look like this:
+
+```console
+# create kind cluster
+kind create cluster --config .github/kind-cluster.yaml
+
+# create reboot required files on pre-defined kind nodes
+./tests/create-reboot-sentinels.sh
+
+# check if reboot is working fine
+./tests/kind/follow-coordinated-reboot.sh
+
+```
+
 ## Publishing a new kured release
 
+### Prepare Documentation
 Check that `README.md` has an updated compatibility matrix and that the
 url in the `kubectl` incantation (under "Installation") is updated to the
 new version you want to release.
 
+### Create a tag on the repo and publish the image
+
+Before going further, we should freeze the code for a release, by
+tagging the code, and publishing its immutable artifact: the kured
+docker image.
+
+```sh
+make DH_ORG="weaveworks" VERSION="1.3.0" image
+```
+
+Then docker push the image. In the future, that might be automatically
+done when creating a tag on the repository, with the help of github
+actions.
+
+### Create the combined manifest
+
+
 Now create the `kured-<release>-dockerhub.yaml` for e.g. `1.3.0`:
 
 ```sh
 VERSION=1.3.0
 MANIFEST="kured-$VERSION-dockerhub.yaml"
+make DH_ORG="weaveworks" VERSION="${VERSION}" manifest
 cat kured-rbac.yaml > "$MANIFEST"
 cat kured-ds.yaml >> "$MANIFEST"
-sed -i "s#docker.io/weaveworks/kured#docker.io/weaveworks/kured:$VERSION#g" "$MANIFEST"
 ```
-
-The last thing you need to do is update the `image:` to point to the release
-tag, e.g. `docker.io/weaveworks/kured:1.3.0`.
+### Publish release artifacts
 
 Now you can head to the Github UI, use the version number as tag and upload the
 `kured-<release>-dockerhub.yaml` file.
 
-### Release notes
-
 Please describe what's new and noteworthy in the release notes, list the PRs
 that landed and give a shout-out to everyone who contributed.
 
 Please also note down on which releases the upcoming `kured` release was
 tested on. (Check old release notes if you're unsure.)
+
+### Update the Helm chart
+
+You can automatically bump the helm chart's application version
+with the latest image tag by running:
+
+```sh
+make DH_ORG="weaveworks" VERSION="1.3.0" helm-chart
+```
+
+A change in the helm chart requires a bump of the `version`
+in `charts/kured/Chart.yaml` (following the versioning rules).
+Update it, and issue a PR. Upon merge, that PR will automatically
+publish the chart to the gh-pages branch.

Makefile

@@ -1,5 +1,5 @@
 .DEFAULT: all
-.PHONY: all clean image publish-image minikube-publish
+.PHONY: all clean image publish-image minikube-publish manifest helm-chart
 
 DH_ORG=weaveworks
 VERSION=$(shell git symbolic-ref --short HEAD)-$(shell git rev-parse --short HEAD)
@@ -33,3 +33,13 @@ publish-image: image
 
 minikube-publish: image
 	$(SUDO) docker save docker.io/$(DH_ORG)/kured | (eval $$(minikube docker-env) && docker load)
+
+manifest:
+	sed -i "s#image: docker.io/.*kured.*#image: docker.io/$(DH_ORG)/kured:$(VERSION)#g" kured-ds.yaml
+	echo "Please generate combined manifest if necessary"
+
+helm-chart:
+	sed -i "s#repository:.*/kured#repository: $(DH_ORG)/kured#g" charts/kured/values.yaml
+	sed -i "s#tag:.*#tag: $(VERSION)#g" charts/kured/values.yaml
+	sed -i "s#appVersion:.*#appVersion: \"$(VERSION)\"#g" charts/kured/Chart.yaml
+	echo "Please bump version in charts/kured/Chart.yaml"

README.md

@@ -1,21 +1,24 @@
 
+# kured - Kubernetes Reboot Daemon
+
 <img src="https://github.com/weaveworks/kured/raw/master/img/logo.png" align="right"/>
 
 * [Introduction](#introduction)
 * [Kubernetes & OS Compatibility](#kubernetes-&-os-compatibility)
 * [Installation](#installation)
 * [Configuration](#configuration)
-	* [Reboot Sentinel File & Period](#reboot-sentinel-file-&-period)
-	* [Setting a schedule](#setting-a-schedule)
-	* [Blocking Reboots via Alerts](#blocking-reboots-via-alerts)
-	* [Blocking Reboots via Pods](#blocking-reboots-via-pods)
-	* [Prometheus Metrics](#prometheus-metrics)
-	* [Slack Notifications](#slack-notifications)
-	* [Overriding Lock Configuration](#overriding-lock-configuration)
+  * [Reboot Sentinel File & Period](#reboot-sentinel-file-&-period)
+  * [Setting a schedule](#setting-a-schedule)
+  * [Blocking Reboots via Alerts](#blocking-reboots-via-alerts)
+  * [Blocking Reboots via Pods](#blocking-reboots-via-pods)
+  * [Prometheus Metrics](#prometheus-metrics)
+  * [Slack Notifications](#slack-notifications)
+  * [Overriding Lock Configuration](#overriding-lock-configuration)
 * [Operation](#operation)
-	* [Testing](#testing)
-	* [Disabling Reboots](#disabling-reboots)
-	* [Manual Unlock](#manual-unlock)
+  * [Testing](#testing)
+  * [Disabling Reboots](#disabling-reboots)
+  * [Manual Unlock](#manual-unlock)
+  * [Automatic Unlock](#automatic-unlock)
 * [Building](#building)
 * [Frequently Asked/Anticipated Questions](#frequently-askedanticipated-questions)
 * [Getting Help](#getting-help)
@@ -34,19 +37,22 @@ indicated by the package management system of the underlying OS.
 
 ## Kubernetes & OS Compatibility
 
-The daemon image contains versions of `k8s.io/client-go` and the
-`kubectl` binary for the purposes of maintaining the lock and draining
-worker nodes. Kubernetes aims to provide forwards & backwards
-compatibility of one minor version between client and server:
+The daemon image contains versions of `k8s.io/client-go` and
+`k8s.io/kubectl` (the binary of `kubectl` in older releases) for the purposes of
+maintaining the lock and draining worker nodes. Kubernetes aims to provide
+forwards and backwards compatibility of one minor version between client and
+server:
 
 | kured  | kubectl | k8s.io/client-go | k8s.io/apimachinery | expected kubernetes compatibility |
 |--------|---------|------------------|---------------------|-----------------------------------|
-| master | 1.18.2  | v0.18.2          | v0.18.2             | 1.17.x, 1.18.x, 1.19.x            |
-| 1.4.0  | 1.17.5  | v0.17.0          | v0.17.0             | 1.16.x, 1.17.x, 1.18.x            |
+| master | 1.19.4  | v0.19.4          | v0.19.4             | 1.18.x, 1.19.x, 1.20.x            |
+| 1.6.0  | 1.19.4  | v0.19.4          | v0.19.4             | 1.18.x, 1.19.x, 1.20.x            |
+| 1.5.1  | 1.18.8  | v0.18.8          | v0.18.8             | 1.17.x, 1.18.x, 1.19.x            |
+| 1.4.4  | 1.17.7  | v0.17.0          | v0.17.0             | 1.16.x, 1.17.x, 1.18.x            |
 | 1.3.0  | 1.15.10 | v12.0.0          | release-1.15        | 1.15.x, 1.16.x, 1.17.x            |
 | 1.2.0  | 1.13.6  | v10.0.0          | release-1.13        | 1.12.x, 1.13.x, 1.14.x            |
 | 1.1.0  | 1.12.1  | v9.0.0           | release-1.12        | 1.11.x, 1.12.x, 1.13.x            |
-| 1.0.0  | 1.7.6   | v4.0.0           | release-1.7         | 1.6.x, 1.7.x, 1.8.x               | 
+| 1.0.0  | 1.7.6   | v4.0.0           | release-1.7         | 1.6.x, 1.7.x, 1.8.x               |
 
 See the [release notes](https://github.com/weaveworks/kured/releases)
 for specific version compatibility information, including which
@@ -60,8 +66,9 @@ Versions >=1.1.0 enter the host mount namespace to invoke
 To obtain a default installation without Prometheus alerting interlock
 or Slack notifications:
 
-```
-kubectl apply -f https://github.com/weaveworks/kured/releases/download/1.3.0/kured-1.3.0-dockerhub.yaml
+```console
+latest=$(curl -s https://api.github.com/repos/weaveworks/kured/releases | jq -r .[0].tag_name)
+kubectl apply -f "https://github.com/weaveworks/kured/releases/download/$latest/kured-$latest-dockerhub.yaml"
 ```
 
 If you want to customise the installation, download the manifest and
@@ -71,8 +78,9 @@ edit it in accordance with the following section before application.
 
 The following arguments can be passed to kured via the daemonset pod template:
 
-```
+```console
 Flags:
+      --lock-ttl time                       force clean annotation after this ammount of time (default 0, disabled)
       --alert-filter-regexp regexp.Regexp   alert names to ignore when checking for active alerts
       --blocking-pod-selector stringArray   label selector identifying pods whose presence should prevent reboots
       --ds-name string                      name of daemonset on which to place lock (default "kured")
@@ -87,6 +95,8 @@ Flags:
       --slack-channel string                slack channel for reboot notfications
       --slack-hook-url string               slack hook URL for reboot notfications
       --slack-username string               slack username for reboot notfications (default "kured")
+      --message-template-drain string       message template used to notify about a node being drained (default "Draining node %s")
+      --message-template-reboot string      message template used to notify about a node being rebooted (default "Rebooting node %s")
       --start-time string                   only reboot after this time of day (default "0:00")
       --time-zone string                    use this timezone to calculate allowed reboot time (default "UTC")
 ```
@@ -108,11 +118,11 @@ reboots to predictable schedules.  Use `--reboot-days`, `--start-time`,
 `--end-time`, and `--time-zone` to set a schedule.  For example, business
 hours on the west coast USA can be specified with:
 
-```
-	--reboot-days mon,tue,wed,thu,fri
-	--start-time 9am
-	--end-time 5pm
-	--time-zone America/Los_Angeles
+```console
+  --reboot-days=mon,tue,wed,thu,fri
+  --start-time=9am
+  --end-time=5pm
+  --time-zone=America/Los_Angeles
 ```
 
 Times can be formatted in numerous ways, including `5pm`, `5:00pm` `17:00`,
@@ -128,14 +138,14 @@ You may find it desirable to block automatic node reboots when there
 are active alerts - you can do so by providing the URL of your
 Prometheus server:
 
-```
+```console
 --prometheus-url=http://prometheus.monitoring.svc.cluster.local
 ```
 
 By default the presence of *any* active (pending or firing) alerts
 will block reboots, however you can ignore specific alerts:
 
-```
+```console
 --alert-filter-regexp=^(RebootRequired|AnotherBenignAlert|...$
 ```
 
@@ -147,14 +157,14 @@ filter.
 You can also block reboots of an _individual node_ when specific pods
 are scheduled on it:
 
-```
+```console
 --blocking-pod-selector=runtime=long,cost=expensive
 ```
 
 Since label selector strings use commas to express logical 'and', you can
 specify this parameter multiple times for 'or':
 
-```
+```console
 --blocking-pod-selector=runtime=long,cost=expensive
 --blocking-pod-selector=name=temperamental
 ```
@@ -172,7 +182,7 @@ running job or a known temperamental pod on a node will stop it rebooting.
 Each kured pod exposes a single gauge metric (`:8080/metrics`) that
 indicates the presence of the sentinel file:
 
-```
+```console
 # HELP kured_reboot_required OS requires reboot due to software updates.
 # TYPE kured_reboot_required gauge
 kured_reboot_required{node="ip-xxx-xxx-xxx-xxx.ec2.internal"} 0
@@ -182,7 +192,7 @@ The purpose of this metric is to power an alert which will summon an
 operator if the cluster cannot reboot itself automatically for a
 prolonged period:
 
-```
+```console
 # Alert if a reboot is required for any machines. Acts as a failsafe for the
 # reboot daemon, which will not reboot nodes if there are pending alerts save
 # this one.
@@ -206,11 +216,16 @@ probe for active alerts before rebooting, be sure to specify
 If you specify a Slack hook via `--slack-hook-url`, kured will notify
 you immediately prior to rebooting a node:
 
-<img src="https://github.com/weaveworks/kured/raw/master/img/slack-notification.png"/>
+![Notification](img/slack-notification.png)
 
 We recommend setting `--slack-username` to be the name of the
 environment, e.g. `dev` or `prod`.
 
+Alternatively you can use the `--message-template-drain` and `--message-template-reboot` to customize the text of the message, e.g.
+```
+--message-template-drain="Draining node %s part of *my-cluster* in region *xyz*"
+```
+
 ### Overriding Lock Configuration
 
 The `--ds-name` and `--ds-namespace` arguments should match the name and
@@ -232,7 +247,7 @@ if you have, you will have to adjust the commands accordingly.
 
 You can test your configuration by provoking a reboot on a node:
 
-```
+```console
 sudo touch /var/run/reboot-required
 ```
 
@@ -241,7 +256,7 @@ sudo touch /var/run/reboot-required
 If you need to temporarily stop kured from rebooting any nodes, you
 can take the lock manually:
 
-```
+```console
 kubectl -n kube-system annotate ds kured weave.works/kured-node-lock='{"nodeID":"manual"}'
 ```
 
@@ -253,32 +268,41 @@ In exceptional circumstances, such as a node experiencing a permanent
 failure whilst rebooting, manual intervention may be required to
 remove the cluster lock:
 
-```
+```console
 kubectl -n kube-system annotate ds kured weave.works/kured-node-lock-
 ```
+
 > NB the `-` at the end of the command is important - it instructs
 > `kubectl` to remove that annotation entirely.
 
+### Automatic Unlock
+
+In exceptional circumstances (especially when used with cluster-autoscaler) a node
+which holds lock might be killed thus annotation will stay there for ever.
+
+Using `--lock-ttl=30m` will allow other nodes to take over if TTL has expired (in this case 30min) and continue reboot process.
+
 ## Building
 
-See the [CircleCI config](.circleci/config.yml) for the preferred
-version of Golang. Kured now uses [Go
+Kured now uses [Go
 Modules](https://github.com/golang/go/wiki/Modules), so build
 instructions vary depending on where you have checked out the
 repository:
 
 **Building outside $GOPATH:**
 
-```
+```console
 make
 ```
 
 **Building inside $GOPATH:**
 
-```
+```console
 GO111MODULE=on make
 ```
 
+You can find the current preferred version of Golang in the [go.mod file](go.mod).
+
 If you are interested in contributing code to kured, please take a look at
 our [development][development] docs.
 
@@ -298,10 +322,10 @@ versioned manifest from the [release page](https://github.com/weaveworks/kured/r
 
 If you have any questions about, feedback for or problems with `kured`:
 
-- Invite yourself to the <a href="https://slack.weave.works/" target="_blank">Weave Users Slack</a>.
-- Ask a question on the [#kured](https://weave-community.slack.com/messages/kured/) slack channel.
-- [File an issue](https://github.com/weaveworks/kured/issues/new).
-- Join us in [our monthly meeting](https://docs.google.com/document/d/1bsHTjHhqaaZ7yJnXF6W8c89UB_yn-OoSZEmDnIP34n8/edit#),
+* Invite yourself to the <a href="https://slack.weave.works/" target="_blank">Weave Users Slack</a>.
+* Ask a question on the [#kured](https://weave-community.slack.com/messages/kured/) slack channel.
+* [File an issue](https://github.com/weaveworks/kured/issues/new).
+* Join us in [our monthly meeting](https://docs.google.com/document/d/1bsHTjHhqaaZ7yJnXF6W8c89UB_yn-OoSZEmDnIP34n8/edit#),
   every fourth Wednesday of the month at 16:00 UTC.
 
 Your feedback is always welcome!

charts/kured/.helmignore

@@ -0,0 +1,21 @@
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj

charts/kured/Chart.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+appVersion: "1.5.1"
+description: A Helm chart for kured
+name: kured
+version: 2.2.3
+home: https://github.com/weaveworks/kured
+maintainers:
+  - name: ckotzbauer
+    email: christian.kotzbauer@gmail.com
+  - name: davidkarlsen
+    email: david@davidkarlsen.com
+sources:
+  - https://github.com/weaveworks/kured
+icon: https://raw.githubusercontent.com/weaveworks/kured/master/img/logo.png

charts/kured/README.md

@@ -0,0 +1,108 @@
+# Kured (KUbernetes REboot Daemon)
+
+## Introduction
+This chart installs the "Kubernetes Reboot Daemon" using the Helm Package Manager.
+
+## Prerequisites
+- Kubernetes 1.9+
+
+## Installing the Chart
+To install the chart with the release name `my-release`:
+```bash
+$ helm repo add kured https://weaveworks.github.io/kured
+$ helm install my-release kured/kured
+```
+
+## Uninstalling the Chart
+To uninstall/delete the `my-release` deployment:
+```bash
+$ helm delete my-release
+```
+
+The command removes all the Kubernetes components associated with the chart and deletes the release.
+
+
+## Migrate from stable Helm-Chart
+The following changes have been made compared to the stable chart:
+- **[BREAKING CHANGE]** The `autolock` feature was removed. Use `configuration.startTime` and `configuration.endTime` instead.
+- Role inconsistencies have been fixed (allowed verbs for modifying the `DaemonSet`, apiGroup of `PodSecurityPolicy`)
+- Added support for affinities.
+- Configuration of cli-flags can be made through a `configuration` object.
+- Added optional `Service` and `ServiceMonitor` support for metrics endpoint.
+
+
+## Configuration
+
+| Config                  | Description                                                                 | Default                    |
+| ------                  | -----------                                                                 | -------                    |
+| `image.repository`      | Image repository                                                            | `weaveworks/kured` |
+| `image.tag`             | Image tag                                                                   | `1.5.1`                    |
+| `image.pullPolicy`      | Image pull policy                                                           | `IfNotPresent`             |
+| `image.pullSecrets`     | Image pull secrets                                                          | `[]`                       |
+| `updateStrategy`        | Daemonset update strategy                                                   | `OnDelete`                 |
+| `podAnnotations`        | Annotations to apply to pods (eg to add Prometheus annotations)             | `{}`                       |
+| `extraArgs`             | Extra arguments to pass to `/usr/bin/kured`. See below.                     | `{}`                       |
+| `extraEnvVars`          | Array of environment variables to pass to the daemonset.                    | `{}`                       |
+| `configuration.lockTtl` | cli-parameter `--lock-ttl`                                                  | `0`                       |
+| `configuration.alertFilterRegexp` | cli-parameter `--alert-filter-regexp`                             | `""`                       |
+| `configuration.blockingPodSelector` | Array of selectors for multiple cli-parameters `--blocking-pod-selector` | `[]`             |
+| `configuration.endTime` | cli-parameter `--end-time`                                                  | `""`                      |
+| `configuration.lockAnnotation` | cli-parameter `--lock-annotation`                                    | `""`                      |
+| `configuration.period` | cli-parameter `--period`                                                     | `""`                      |
+| `configuration.prometheusUrl` | cli-parameter `--prometheus-url`                                      | `""`                      |
+| `configuration.rebootDays` | Array of days for multiple cli-parameters `--reboot-days`                | `[]`                      |
+| `configuration.rebootSentinel` | cli-parameter `--reboot-sentinel`                                    | `""`                      |
+| `configuration.slackChannel` | cli-parameter `--slack-channel`                                        | `""`                      |
+| `configuration.slackHookUrl` | cli-parameter `--slack-hook-url`                                       | `""`                      |
+| `configuration.slackUsername` | cli-parameter `--slack-username`                                      | `""`                      |
+| `configuration.messageTemplateDrain` | cli-parameter `--message-template-drain`                       | `""`                      |
+| `configuration.messageTemplateReboot` | cli-parameter `--message-template-reboot`                     | `""`                      |
+| `configuration.startTime` | cli-parameter `--start-time`                                              | `""`                      |
+| `configuration.timeZone` | cli-parameter `--time-zone`                                                | `""`                      |
+| `rbac.create`           | Create RBAC roles                                                           | `true`                     |
+| `serviceAccount.create` | Create a service account                                                    | `true`                     |
+| `serviceAccount.name`   | Service account name to create (or use if `serviceAccount.create` is false) | (chart fullname)           |
+| `podSecurityPolicy.create` | Create podSecurityPolicy                                                 | `false`                     |
+| `resources`             | Resources requests and limits.                                              | `{}`                       |
+| `metrics.create`        | Create a ServiceMonitor for prometheus-operator                             | `false`                    |
+| `metrics.namespace`     | The namespace to create the ServiceMonitor in                               | `""`                    |
+| `metrics.labels`        | Additional labels for the ServiceMonitor                                    | `{}`                    |
+| `metrics.interval`      | Interval prometheus should scrape the endpoint                              | `60s`                   |
+| `metrics.scrapeTimeout` | A custom scrapeTimeout for prometheus                                       | `""`                    |
+| `service.create`        | Create a Service for the metrics endpoint                                   | `false`                    |
+| `service.port`          | Port of the service to expose                                               | `8080`                     |
+| `service.annotations`   | Annotations to apply to the service (eg to add Prometheus annotations)      | `{}`                       |
+| `priorityClassName`     | Priority Class to be used by the pods                                       | `""`                       |
+| `tolerations`           | Tolerations to apply to the daemonset (eg to allow running on master)       | `[{"key": "node-role.kubernetes.io/master", "effect": "NoSchedule"}]`|
+| `affinity`              | Affinity for the daemonset (ie, restrict which nodes kured runs on)         | `{}`                       |
+| `nodeSelector`          | Node Selector for the daemonset (ie, restrict which nodes kured runs on)    | `{}`                       |
+
+See https://github.com/weaveworks/kured#configuration for values (not contained in the `configuration` object) for `extraArgs`. Note that
+```yaml
+extraArgs:
+  foo: 1
+  bar-baz: 2
+```
+becomes `/usr/bin/kured ... --foo=1 --bar-baz=2`.
+
+
+## Prometheus Metrics
+
+Kured exposes a single prometheus metric indicating whether a reboot is required or not (see [kured docs](https://github.com/weaveworks/kured#prometheus-metrics)) for details.
+
+#### Prometheus-Operator
+
+```yaml
+metrics:
+  create: true
+```
+
+#### Prometheus Annotations
+
+```yaml
+service:
+  annotations:
+    prometheus.io/scrape: "true"
+    prometheus.io/path: "/metrics"
+    prometheus.io/port: "8080"
+```

charts/kured/templates/NOTES.txt

@@ -0,0 +1,3 @@
+Kured will check for /var/run/reboot-required, and reboot nodes when needed.
+
+See https://github.com/weaveworks/kured/ for details.

charts/kured/templates/_helpers.tpl

@@ -0,0 +1,72 @@
+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "kured.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "kured.fullname" -}}
+{{- if .Values.fullnameOverride -}}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- $name := default .Chart.Name .Values.nameOverride -}}
+{{- if contains $name .Release.Name -}}
+{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "kured.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "kured.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create -}}
+    {{ default (include "kured.fullname" .) .Values.serviceAccount.name }}
+{{- else -}}
+    {{ default "default" .Values.serviceAccount.name }}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Return the appropriate apiVersion for podsecuritypolicy.
+*/}}
+{{- define "kured.psp.apiVersion" -}}
+{{- if semverCompare "<1.10-0" .Capabilities.KubeVersion.GitVersion -}}
+{{- print "extensions/v1beta1" -}}
+{{- else -}}
+{{- print "policy/v1beta1" -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Returns a set of labels applied to each resource.
+*/}}
+{{- define "kured.labels" -}}
+app: {{ template "kured.name" . }}
+chart: {{ template "kured.chart" . }}
+release: {{ .Release.Name }}
+heritage: {{ .Release.Service }}
+{{- end -}}
+
+{{/*
+Returns a set of matchLabels applied.
+*/}}
+{{- define "kured.matchLabels" -}}
+app: {{ template "kured.name" . }}
+release: {{ .Release.Name }}
+{{- end -}}

charts/kured/templates/clusterrole.yaml

@@ -0,0 +1,30 @@
+{{- if .Values.rbac.create -}}
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: {{ template "kured.fullname" . }}
+  labels:
+    {{- include "kured.labels" . | nindent 4 }}
+rules:
+# Allow kured to read spec.unschedulable
+# Allow kubectl to drain/uncordon
+#
+# NB: These permissions are tightly coupled to the bundled version of kubectl; the ones below
+# match https://github.com/kubernetes/kubernetes/blob/v1.19.4/staging/src/k8s.io/kubectl/pkg/cmd/drain/drain.go
+#
+- apiGroups: [""]
+  resources: ["nodes"]
+  verbs:     ["get", "patch"]
+- apiGroups: [""]
+  resources: ["pods"]
+  verbs:     ["list","delete","get"]
+- apiGroups: ["extensions"]
+  resources: ["daemonsets"]
+  verbs:     ["get"]
+- apiGroups: ["apps"]
+  resources: ["daemonsets"]
+  verbs:     ["get"]
+- apiGroups: [""]
+  resources: ["pods/eviction"]
+  verbs:     ["create"]
+{{- end -}}

charts/kured/templates/clusterrolebinding.yaml

@@ -0,0 +1,16 @@
+{{- if .Values.rbac.create -}}
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: {{ template "kured.fullname" . }}
+  labels:
+    {{- include "kured.labels" . | nindent 4 }}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: {{ template "kured.fullname" . }}
+subjects:
+- kind: ServiceAccount
+  name: {{ template "kured.serviceAccountName" . }}
+  namespace: {{ .Release.Namespace }}
+{{- end -}}

charts/kured/templates/daemonset.yaml

@@ -0,0 +1,127 @@
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: {{ template "kured.fullname" . }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    {{- include "kured.labels" . | nindent 4 }}
+spec:
+  updateStrategy:
+    type: {{ .Values.updateStrategy }}
+  selector:
+    matchLabels:
+      {{- include "kured.matchLabels" . | nindent 6 }}
+  template:
+    metadata:
+      labels:
+        {{- include "kured.labels" . | nindent 8 }}
+      {{- if .Values.podAnnotations }}
+      annotations:
+      {{- range $key, $value := .Values.podAnnotations }}
+        {{ $key }}: {{ $value | quote }}
+      {{- end }}
+      {{- end }}
+    spec:
+      serviceAccountName: {{ template "kured.serviceAccountName" . }}
+      hostPID: true
+      restartPolicy: Always
+      {{- with .Values.image.pullSecrets }}
+      imagePullSecrets:
+{{ toYaml . | indent 8 }}
+      {{- end }}
+      {{- if .Values.priorityClassName }}
+      priorityClassName: {{ .Values.priorityClassName }}
+      {{- end }}
+      containers:
+        - name: {{ .Chart.Name }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          securityContext:
+            privileged: true # Give permission to nsenter /proc/1/ns/mnt
+          resources:
+{{ toYaml .Values.resources | indent 12 }}
+          command:
+            - /usr/bin/kured
+          args:
+            - --ds-name={{ template "kured.fullname" . }}
+            - --ds-namespace={{ .Release.Namespace }}
+          {{- if .Values.configuration.lockTtl }}
+            - --lock-ttl={{ .Values.configuration.lockTtl }}
+          {{- end }}
+          {{- if .Values.configuration.alertFilterRegexp }}
+            - --alert-filter-regexp={{ .Values.configuration.alertFilterRegexp }}
+          {{- end }}
+          {{- range .Values.configuration.blockingPodSelector }}
+            - --blocking-pod-selector={{ . }}
+          {{- end }}
+          {{- if .Values.configuration.endTime }}
+            - --end-time={{ .Values.configuration.endTime }}
+          {{- end }}
+          {{- if .Values.configuration.lockAnnotation }}
+            - --lock-annotation={{ .Values.configuration.lockAnnotation }}
+          {{- end }}
+          {{- if .Values.configuration.period }}
+            - --period={{ .Values.configuration.period }}
+          {{- end }}
+          {{- if .Values.configuration.prometheusUrl }}
+            - --prometheus-url={{ .Values.configuration.prometheusUrl }}
+          {{- end }}
+          {{- range .Values.configuration.rebootDays }}
+            - --reboot-days={{ . }}
+          {{- end }}
+          {{- if .Values.configuration.rebootSentinel }}
+            - --reboot-sentinel={{ .Values.configuration.rebootSentinel }}
+          {{- end }}
+          {{- if .Values.configuration.slackChannel }}
+            - --slack-channel={{ .Values.configuration.slackChannel }}
+          {{- end }}
+          {{- if .Values.configuration.slackHookUrl }}
+            - --slack-hook-url={{ .Values.configuration.slackHookUrl }}
+          {{- end }}
+          {{- if .Values.configuration.slackUsername }}
+            - --slack-username={{ .Values.configuration.slackUsername }}
+          {{- end }}
+          {{- if .Values.configuration.messageTemplateDrain }}
+            - --message-template-drain={{ .Values.configuration.messageTemplateDrain }}
+          {{- end }}
+          {{- if .Values.configuration.messageTemplateReboot }}
+            - --message-template-reboot={{ .Values.configuration.messageTemplateReboot }}
+          {{- end }}
+          {{- if .Values.configuration.startTime }}
+            - --start-time={{ .Values.configuration.startTime }}
+          {{- end }}
+          {{- if .Values.configuration.timeZone }}
+            - --time-zone={{ .Values.configuration.timeZone }}
+          {{- end }}
+          {{- range $key, $value := .Values.extraArgs }}
+            {{- if $value }}
+            - --{{ $key }}={{ $value }}
+            {{- else }}
+            - --{{ $key }}
+            {{- end }}
+          {{- end }}
+          ports:
+            - containerPort: 8080
+              name: metrics
+          env:
+            # Pass in the name of the node on which this pod is scheduled
+            # for use with drain/uncordon operations and lock acquisition
+            - name: KURED_NODE_ID
+              valueFrom:
+                fieldRef:
+                  fieldPath: spec.nodeName
+            {{- if .Values.extraEnvVars }}
+              {{ toYaml .Values.extraEnvVars | nindent 12 }}
+            {{- end }}
+      {{- with .Values.tolerations }}
+      tolerations:
+{{ toYaml . | indent 8 }}
+      {{- end }}
+      {{- with .Values.nodeSelector }}
+      nodeSelector:
+{{ toYaml . | indent 8 }}
+      {{- end }}
+      {{- with .Values.affinity }}
+      affinity:
+{{ toYaml . | indent 8 }}
+      {{- end }}

charts/kured/templates/podsecuritypolicy.yaml

@@ -0,0 +1,21 @@
+{{- if .Values.podSecurityPolicy.create}}
+apiVersion: {{ template "kured.psp.apiVersion" . }}
+kind: PodSecurityPolicy
+metadata:
+  name: {{ template "kured.fullname" . }}
+  labels:
+    {{- include "kured.labels" . | nindent 4 }}
+spec:
+  privileged: true
+  hostPID: true
+  allowedCapabilities: ['*']
+  fsGroup:
+    rule: RunAsAny
+  runAsUser:
+    rule: RunAsAny
+  seLinux:
+    rule: RunAsAny
+  supplementalGroups:
+    rule: RunAsAny
+  volumes: ['*']
+{{- end }}

charts/kured/templates/role.yaml

@@ -0,0 +1,30 @@
+{{- if .Values.rbac.create -}}
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  namespace: {{ .Release.Namespace }}
+  name: {{ template "kured.fullname" . }}
+  labels:
+    {{- include "kured.labels" . | nindent 4 }}
+rules:
+  # Allow kured to lock/unlock itself
+  - apiGroups:     ["extensions"]
+    resources:     ["daemonsets"]
+    resourceNames: ["{{ template "kured.fullname" . }}"]
+    verbs:         ["update", "patch"]
+  - apiGroups:     ["apps"]
+    resources:     ["daemonsets"]
+    resourceNames: ["{{ template "kured.fullname" . }}"]
+    verbs:         ["update", "patch"]
+{{- if .Values.podSecurityPolicy.create }}
+  - apiGroups:     ["extensions"]
+    resources:     ["podsecuritypolicies"]
+    resourceNames: ["{{ template "kured.fullname" . }}"]
+    verbs:         ["use"]
+  - apiGroups:     ["policy"]
+    resources:     ["podsecuritypolicies"]
+    resourceNames: ["{{ template "kured.fullname" . }}"]
+    verbs:         ["use"]
+{{- end }}
+
+{{- end -}}

charts/kured/templates/rolebinding.yaml

@@ -0,0 +1,17 @@
+{{- if .Values.rbac.create -}}
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  namespace: {{ .Release.Namespace }}
+  name: {{ template "kured.fullname" . }}
+  labels:
+    {{- include "kured.labels" . | nindent 4 }}
+subjects:
+- kind: ServiceAccount
+  namespace: {{ .Release.Namespace }}
+  name: {{ template "kured.serviceAccountName" . }}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: {{ template "kured.fullname" . }}
+{{- end -}}

charts/kured/templates/service.yaml

@@ -0,0 +1,22 @@
+{{- if or .Values.service.create .Values.metrics.create }}
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ template "kured.fullname" . }}
+  labels:
+    {{- include "kured.labels" . | nindent 4 }}
+  {{- if .Values.service.annotations }}
+  annotations:
+  {{- range $key, $value := .Values.service.annotations }}
+    {{ $key }}: {{ $value | quote }}
+  {{- end }}
+  {{- end }}
+spec:
+  type: ClusterIP
+  ports:
+    - name: metrics
+      port: {{ .Values.service.port }}
+      targetPort: 8080
+  selector:
+    {{- include "kured.matchLabels" . | nindent 4 }}
+{{- end }}

charts/kured/templates/serviceaccount.yaml

@@ -0,0 +1,9 @@
+{{- if .Values.serviceAccount.create -}}
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: {{ template "kured.serviceAccountName" . }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    {{- include "kured.labels" . | nindent 4 }}
+{{- end -}}

charts/kured/templates/servicemonitor.yaml

@@ -0,0 +1,31 @@
+{{- if .Values.metrics.create }}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ template "kured.fullname" . }}
+  {{- if .Values.metrics.namespace }}
+  namespace: {{ .Values.metrics.namespace }}
+  {{- end }}
+  labels:
+    {{- include "kured.labels" . | nindent 4 }}
+    {{- if .Values.metrics.labels }}
+    {{- toYaml .Values.metrics.labels | nindent 4 }}
+    {{- end }}
+spec:
+  endpoints:
+  - interval: {{ .Values.metrics.interval }}
+    {{- if .Values.metrics.scrapeTimeout }}
+    scrapeTimeout: {{ .Values.metrics.scrapeTimeout }}
+    {{- end }}
+    honorLabels: true
+    targetPort: 8080
+    path: /metrics
+    scheme: http
+  jobLabel: "{{ .Release.Name }}"
+  selector:
+    matchLabels:
+      {{- include "kured.matchLabels" . | nindent 6 }}
+  namespaceSelector:
+    matchNames:
+      - {{ .Release.Namespace }}
+{{- end }}

charts/kured/values.minikube.yaml

@@ -0,0 +1,21 @@
+image:
+  repository: weaveworks/kured
+  tag: latest
+
+configuration:
+  # annotationTtl: 0          # force clean annotation after this ammount of time (default 0, disabled)
+  # alertFilterRegexp: ""     # alert names to ignore when checking for active alerts
+  # blockingPodSelector: []   # label selector identifying pods whose presence should prevent reboots
+  # endTime: ""               # only reboot before this time of day (default "23:59")
+  # lockAnnotation: ""        # annotation in which to record locking node (default "weave.works/kured-node-lock")
+  period: "1m"                # reboot check period (default 1h0m0s)
+  # prometheusUrl: ""         # Prometheus instance to probe for active alerts
+  # rebootDays: []            # only reboot on these days (default [su,mo,tu,we,th,fr,sa])
+  # rebootSentinel: ""        # path to file whose existence signals need to reboot (default "/var/run/reboot-required")
+  # slackChannel: ""          # slack channel for reboot notfications
+  # slackHookUrl: ""          # slack hook URL for reboot notfications
+  # slackUsername: ""         # slack username for reboot notfications (default "kured")
+  # messageTemplateDrain: ""  # slack message template when notifying about a node being drained (default "Draining node %s")
+  # messageTemplateReboot: "" # slack message template when notifying about a node being rebooted (default "Rebooted node %s")
+  # startTime: ""             # only reboot after this time of day (default "0:00")
+  # timeZone: ""              # time-zone to use (valid zones from "time" golang package)

charts/kured/values.yaml

@@ -0,0 +1,72 @@
+image:
+  repository: weaveworks/kured
+  tag: 1.5.1
+  pullPolicy: IfNotPresent
+  pullSecrets: []
+
+updateStrategy: OnDelete
+
+podAnnotations: {}
+
+extraArgs: {}
+
+extraEnvVars:
+#  - name: slackHookUrl
+#    valueFrom:
+#      secretKeyRef:
+#        name: secret_name
+#        key: secret_key
+#  - name: regularEnvVariable
+#    value: 123
+
+configuration:
+  lockTtl: 0                 # force clean annotation after this ammount of time (default 0, disabled)
+  alertFilterRegexp: ""      # alert names to ignore when checking for active alerts
+  blockingPodSelector: []    # label selector identifying pods whose presence should prevent reboots
+  endTime: ""                # only reboot before this time of day (default "23:59")
+  lockAnnotation: ""         # annotation in which to record locking node (default "weave.works/kured-node-lock")
+  period: ""                 # reboot check period (default 1h0m0s)
+  prometheusUrl: ""          # Prometheus instance to probe for active alerts
+  rebootDays: []             # only reboot on these days (default [su,mo,tu,we,th,fr,sa])
+  rebootSentinel: ""         # path to file whose existence signals need to reboot (default "/var/run/reboot-required")
+  slackChannel: ""           # slack channel for reboot notfications
+  slackHookUrl: ""           # slack hook URL for reboot notfications
+  slackUsername: ""          # slack username for reboot notfications (default "kured")
+  messageTemplateDrain: ""   # slack message template when notifying about a node being drained (default "Draining node %s")
+  messageTemplateReboot: ""  # slack message template when notifying about a node being rebooted (default "Rebooted node %s")
+  startTime: ""              # only reboot after this time of day (default "0:00")
+  timeZone: ""               # time-zone to use (valid zones from "time" golang package)
+
+rbac:
+  create: true
+
+serviceAccount:
+  create: true
+  name:
+
+podSecurityPolicy:
+  create: false
+
+resources: {}
+
+metrics:
+  create: false
+  namespace: ""
+  labels: {}
+  interval: 60s
+  scrapeTimeout: ""
+
+service:
+  create: false
+  port: 8080
+  annotations: {}
+
+priorityClassName: ""
+
+tolerations:
+  - key: node-role.kubernetes.io/master
+    effect: NoSchedule
+
+affinity: {}
+
+nodeSelector: {}

cmd/kured/Dockerfile

@@ -1,7 +1,4 @@
-FROM alpine:3.11
-RUN apk update && apk add ca-certificates tzdata && rm -rf /var/cache/apk/*
-# NB: you may need to update RBAC permissions when upgrading kubectl - see kured-rbac.yaml for details
-ADD https://storage.googleapis.com/kubernetes-release/release/v1.18.2/bin/linux/amd64/kubectl /usr/bin/kubectl
-RUN chmod 0755 /usr/bin/kubectl
+FROM alpine:3.12
+RUN apk update --no-cache && apk upgrade --no-cache && apk add --no-cache ca-certificates tzdata
 COPY ./kured /usr/bin/kured
 ENTRYPOINT ["/usr/bin/kured"]

cmd/kured/main.go

@@ -12,9 +12,11 @@ import (
 
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
+	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"
+	kubectldrain "k8s.io/kubectl/pkg/drain"
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
@@ -29,17 +31,20 @@ var (
 	version = "unreleased"
 
 	// Command line flags
-	period         time.Duration
-	dsNamespace    string
-	dsName         string
-	lockAnnotation string
-	prometheusURL  string
-	alertFilter    *regexp.Regexp
-	rebootSentinel string
-	slackHookURL   string
-	slackUsername  string
-	slackChannel   string
-	podSelectors   []string
+	period                 time.Duration
+	dsNamespace            string
+	dsName                 string
+	lockAnnotation         string
+	lockTTL                time.Duration
+	prometheusURL          string
+	alertFilter            *regexp.Regexp
+	rebootSentinel         string
+	slackHookURL           string
+	slackUsername          string
+	slackChannel           string
+	messageTemplateDrain   string
+	messageTemplateReboot  string
+	podSelectors           []string
 
 	rebootDays  []string
 	rebootStart string
@@ -72,6 +77,8 @@ func main() {
 		"name of daemonset on which to place lock")
 	rootCmd.PersistentFlags().StringVar(&lockAnnotation, "lock-annotation", "weave.works/kured-node-lock",
 		"annotation in which to record locking node")
+	rootCmd.PersistentFlags().DurationVar(&lockTTL, "lock-ttl", 0,
+		"expire lock annotation after this duration (default: 0, disabled)")
 	rootCmd.PersistentFlags().StringVar(&prometheusURL, "prometheus-url", "",
 		"Prometheus instance to probe for active alerts")
 	rootCmd.PersistentFlags().Var(&regexpValue{&alertFilter}, "alert-filter-regexp",
@@ -85,6 +92,10 @@ func main() {
 		"slack username for reboot notfications")
 	rootCmd.PersistentFlags().StringVar(&slackChannel, "slack-channel", "",
 		"slack channel for reboot notfications")
+	rootCmd.PersistentFlags().StringVar(&messageTemplateDrain, "message-template-drain", "Draining node %s",
+		"message template used to notify about a node being drained")
+	rootCmd.PersistentFlags().StringVar(&messageTemplateReboot, "message-template-reboot", "Rebooting node %s",
+		"message template used to notify about a node being rebooted")
 
 	rootCmd.PersistentFlags().StringArrayVar(&podSelectors, "blocking-pod-selector", nil,
 		"label selector identifying pods whose presence should prevent reboots")
@@ -144,10 +155,9 @@ func rebootRequired() bool {
 	if sentinelExists() {
 		log.Infof("Reboot required")
 		return true
-	} else {
-		log.Infof("Reboot not required")
-		return false
 	}
+	log.Infof("Reboot not required")
+	return false
 }
 
 func rebootBlocked(client *kubernetes.Clientset, nodeID string) bool {
@@ -205,8 +215,8 @@ func holding(lock *daemonsetlock.DaemonSetLock, metadata interface{}) bool {
 	return holding
 }
 
-func acquire(lock *daemonsetlock.DaemonSetLock, metadata interface{}) bool {
-	holding, holder, err := lock.Acquire(metadata)
+func acquire(lock *daemonsetlock.DaemonSetLock, metadata interface{}, TTL time.Duration) bool {
+	holding, holder, err := lock.Acquire(metadata, TTL)
 	switch {
 	case err != nil:
 		log.Fatalf("Error acquiring lock: %v", err)
@@ -227,28 +237,45 @@ func release(lock *daemonsetlock.DaemonSetLock) {
 	}
 }
 
-func drain(nodeID string) {
-	log.Infof("Draining node %s", nodeID)
+func drain(client *kubernetes.Clientset, node *v1.Node) {
+	nodename := node.GetName()
+
+	log.Infof("Draining node %s", nodename)
 
 	if slackHookURL != "" {
-		if err := slack.NotifyDrain(slackHookURL, slackUsername, slackChannel, nodeID); err != nil {
+		if err := slack.NotifyDrain(slackHookURL, slackUsername, slackChannel, messageTemplateDrain, nodename); err != nil {
 			log.Warnf("Error notifying slack: %v", err)
 		}
 	}
 
-	drainCmd := newCommand("/usr/bin/kubectl", "drain",
-		"--ignore-daemonsets", "--delete-local-data", "--force", nodeID)
+	drainer := &kubectldrain.Helper{
+		Client:              client,
+		GracePeriodSeconds:  -1,
+		Force:               true,
+		DeleteLocalData:     true,
+		IgnoreAllDaemonSets: true,
+		ErrOut:              os.Stderr,
+		Out:                 os.Stdout,
+	}
+	if err := kubectldrain.RunCordonOrUncordon(drainer, node, true); err != nil {
+		log.Fatal("Error cordonning %s: %v", nodename, err)
+	}
 
-	if err := drainCmd.Run(); err != nil {
-		log.Fatalf("Error invoking drain command: %v", err)
+	if err := kubectldrain.RunNodeDrain(drainer, nodename); err != nil {
+		log.Fatal("Error draining %s: %v", nodename, err)
 	}
 }
 
-func uncordon(nodeID string) {
-	log.Infof("Uncordoning node %s", nodeID)
-	uncordonCmd := newCommand("/usr/bin/kubectl", "uncordon", nodeID)
-	if err := uncordonCmd.Run(); err != nil {
-		log.Fatalf("Error invoking uncordon command: %v", err)
+func uncordon(client *kubernetes.Clientset, node *v1.Node) {
+	nodename := node.GetName()
+	log.Infof("Uncordoning node %s", nodename)
+	drainer := &kubectldrain.Helper{
+		Client: client,
+		ErrOut: os.Stderr,
+		Out:    os.Stdout,
+	}
+	if err := kubectldrain.RunCordonOrUncordon(drainer, node, false); err != nil {
+		log.Fatal("Error uncordonning %s: %v", nodename, err)
 	}
 }
 
@@ -256,7 +283,7 @@ func commandReboot(nodeID string) {
 	log.Infof("Commanding reboot for node: %s", nodeID)
 
 	if slackHookURL != "" {
-		if err := slack.NotifyReboot(slackHookURL, slackUsername, slackChannel, nodeID); err != nil {
+		if err := slack.NotifyReboot(slackHookURL, slackUsername, slackChannel, messageTemplateReboot, nodeID); err != nil {
 			log.Warnf("Error notifying slack: %v", err)
 		}
 	}
@@ -284,7 +311,7 @@ type nodeMeta struct {
 	Unschedulable bool `json:"unschedulable"`
 }
 
-func rebootAsRequired(nodeID string, window *timewindow.TimeWindow) {
+func rebootAsRequired(nodeID string, window *timewindow.TimeWindow, TTL time.Duration) {
 	config, err := rest.InClusterConfig()
 	if err != nil {
 		log.Fatal(err)
@@ -300,14 +327,18 @@ func rebootAsRequired(nodeID string, window *timewindow.TimeWindow) {
 	nodeMeta := nodeMeta{}
 	if holding(lock, &nodeMeta) {
 		if !nodeMeta.Unschedulable {
-			uncordon(nodeID)
+			node, err := client.CoreV1().Nodes().Get(context.TODO(), nodeID, metav1.GetOptions{})
+			if err != nil {
+				log.Fatal(err)
+			}
+			uncordon(client, node)
 		}
 		release(lock)
 	}
 
 	source := rand.NewSource(time.Now().UnixNano())
 	tick := delaytick.New(source, period)
-	for _ = range tick {
+	for range tick {
 		if window.Contains(time.Now()) && rebootRequired() && !rebootBlocked(client, nodeID) {
 			node, err := client.CoreV1().Nodes().Get(context.TODO(), nodeID, metav1.GetOptions{})
 			if err != nil {
@@ -315,9 +346,9 @@ func rebootAsRequired(nodeID string, window *timewindow.TimeWindow) {
 			}
 			nodeMeta.Unschedulable = node.Spec.Unschedulable
 
-			if acquire(lock, &nodeMeta) {
+			if acquire(lock, &nodeMeta, TTL) {
 				if !nodeMeta.Unschedulable {
-					drain(nodeID)
+					drain(client, node)
 				}
 				commandReboot(nodeID)
 				for {
@@ -344,11 +375,16 @@ func root(cmd *cobra.Command, args []string) {
 
 	log.Infof("Node ID: %s", nodeID)
 	log.Infof("Lock Annotation: %s/%s:%s", dsNamespace, dsName, lockAnnotation)
+	if lockTTL > 0 {
+		log.Infof("Lock TTL set, lock will expire after: %v", lockTTL)
+	} else {
+		log.Info("Lock TTL not set, lock will remain until being released")
+	}
 	log.Infof("Reboot Sentinel: %s every %v", rebootSentinel, period)
 	log.Infof("Blocking Pod Selectors: %v", podSelectors)
 	log.Infof("Reboot on: %v", window)
 
-	go rebootAsRequired(nodeID, window)
+	go rebootAsRequired(nodeID, window, lockTTL)
 	go maintainRebootRequiredMetric(nodeID)
 
 	http.Handle("/metrics", promhttp.Handler())

cmd/prom-active-alerts/main.go

@@ -1,23 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"log"
-	"os"
-	"regexp"
-
-	"github.com/weaveworks/kured/pkg/alerts"
-)
-
-func main() {
-	if len(os.Args) != 3 {
-		log.Fatalf("USAGE: %s <prometheusURL> <filterRegexp>", os.Args[0])
-	}
-
-	count, err := alerts.PrometheusCountActive(os.Args[1], regexp.MustCompile(os.Args[2]))
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	fmt.Println(count)
-}

go.mod

@@ -1,15 +1,14 @@
 module github.com/weaveworks/kured
 
-go 1.13
+go 1.15
 
 require (
-	github.com/googleapis/gnostic v0.2.0 // indirect
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/prometheus/client_golang v0.0.0-20181230203121-fb3d5cb2ad57
-	github.com/prometheus/common v0.0.0-20181218105931-67670fe90761
-	github.com/prometheus/procfs v0.0.0-20190102135031-14fa7590c24d // indirect
-	github.com/sirupsen/logrus v1.2.0
-	github.com/spf13/cobra v0.0.0-20181127133106-d2d81d9a96e2
-	k8s.io/apimachinery v0.18.2
-	k8s.io/client-go v0.18.2
+	github.com/prometheus/client_golang v1.8.0
+	github.com/prometheus/common v0.15.0
+	github.com/sirupsen/logrus v1.7.0
+	github.com/spf13/cobra v1.1.1
+	k8s.io/api v0.19.4
+	k8s.io/apimachinery v0.19.4
+	k8s.io/client-go v0.19.4
+	k8s.io/kubectl v0.19.4
 )

go.sum

@@ -1,86 +1,329 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
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kured-ds.yaml

@@ -59,5 +59,7 @@ spec:
 #            - --slack-hook-url=https://hooks.slack.com/...
 #            - --slack-username=prod
 #            - --slack-channel=alerting
+#            - --message-template-drain=Draining node %s
+#            - --message-template-drain=Rebooting node %s
 #            - --start-time=0:00
 #            - --time-zone=UTC

kured-rbac.yaml

@@ -8,7 +8,7 @@ rules:
 # Allow kubectl to drain/uncordon
 #
 # NB: These permissions are tightly coupled to the bundled version of kubectl; the ones below
-# match https://github.com/kubernetes/kubernetes/blob/v1.18.2/staging/src/k8s.io/kubectl/pkg/cmd/drain/drain.go
+# match https://github.com/kubernetes/kubernetes/blob/v1.19.4/staging/src/k8s.io/kubectl/pkg/cmd/drain/drain.go
 #
 - apiGroups: [""]
   resources: ["nodes"]

pkg/alerts/prometheus.go

@@ -8,11 +8,11 @@ import (
 	"time"
 
 	"github.com/prometheus/client_golang/api"
-	"github.com/prometheus/client_golang/api/prometheus/v1"
+	v1 "github.com/prometheus/client_golang/api/prometheus/v1"
 	"github.com/prometheus/common/model"
 )
 
-// Returns a list of names of active (e.g. pending or firing) alerts, filtered
+// PrometheusActiveAlerts returns a list of names of active (e.g. pending or firing) alerts, filtered
 // by the supplied regexp.
 func PrometheusActiveAlerts(prometheusURL string, filter *regexp.Regexp) ([]string, error) {
 	client, err := api.NewClient(api.Config{Address: prometheusURL})
@@ -22,7 +22,7 @@ func PrometheusActiveAlerts(prometheusURL string, filter *regexp.Regexp) ([]stri
 
 	queryAPI := v1.NewAPI(client)
 
-	value, err := queryAPI.Query(context.Background(), "ALERTS", time.Now())
+	value, _, err := queryAPI.Query(context.Background(), "ALERTS", time.Now())
 	if err != nil {
 		return nil, err
 	}
@@ -39,7 +39,7 @@ func PrometheusActiveAlerts(prometheusURL string, filter *regexp.Regexp) ([]stri
 			}
 
 			var activeAlerts []string
-			for activeAlert, _ := range activeAlertSet {
+			for activeAlert := range activeAlertSet {
 				activeAlerts = append(activeAlerts, activeAlert)
 			}
 			sort.Sort(sort.StringSlice(activeAlerts))

pkg/daemonsetlock/daemonsetlock.go

@@ -11,6 +11,8 @@ import (
 	"k8s.io/client-go/kubernetes"
 )
 
+// DaemonSetLock holds all necessary information to do actions
+// on the kured ds which holds lock info through annotations.
 type DaemonSetLock struct {
 	client     *kubernetes.Clientset
 	nodeID     string
@@ -20,15 +22,19 @@ type DaemonSetLock struct {
 }
 
 type lockAnnotationValue struct {
-	NodeID   string      `json:"nodeID"`
-	Metadata interface{} `json:"metadata,omitempty"`
+	NodeID   string        `json:"nodeID"`
+	Metadata interface{}   `json:"metadata,omitempty"`
+	Created  time.Time     `json:"created"`
+	TTL      time.Duration `json:"TTL"`
 }
 
+// New creates a daemonsetLock object containing the necessary data for follow up k8s requests
 func New(client *kubernetes.Clientset, nodeID, namespace, name, annotation string) *DaemonSetLock {
 	return &DaemonSetLock{client, nodeID, namespace, name, annotation}
 }
 
-func (dsl *DaemonSetLock) Acquire(metadata interface{}) (acquired bool, owner string, err error) {
+// Acquire attempts to annotate the kured daemonset with lock info from instantiated DaemonSetLock using client-go
+func (dsl *DaemonSetLock) Acquire(metadata interface{}, TTL time.Duration) (acquired bool, owner string, err error) {
 	for {
 		ds, err := dsl.client.AppsV1().DaemonSets(dsl.namespace).Get(context.TODO(), dsl.name, metav1.GetOptions{})
 		if err != nil {
@@ -41,13 +47,16 @@ func (dsl *DaemonSetLock) Acquire(metadata interface{}) (acquired bool, owner st
 			if err := json.Unmarshal([]byte(valueString), &value); err != nil {
 				return false, "", err
 			}
-			return value.NodeID == dsl.nodeID, value.NodeID, nil
+
+			if !ttlExpired(value.Created, value.TTL) {
+				return value.NodeID == dsl.nodeID, value.NodeID, nil
+			}
 		}
 
 		if ds.ObjectMeta.Annotations == nil {
 			ds.ObjectMeta.Annotations = make(map[string]string)
 		}
-		value := lockAnnotationValue{NodeID: dsl.nodeID, Metadata: metadata}
+		value := lockAnnotationValue{NodeID: dsl.nodeID, Metadata: metadata, Created: time.Now().UTC(), TTL: TTL}
 		valueBytes, err := json.Marshal(&value)
 		if err != nil {
 			return false, "", err
@@ -68,6 +77,7 @@ func (dsl *DaemonSetLock) Acquire(metadata interface{}) (acquired bool, owner st
 	}
 }
 
+// Test attempts to check the kured daemonset lock status (existence, expiry) from instantiated DaemonSetLock using client-go
 func (dsl *DaemonSetLock) Test(metadata interface{}) (holding bool, err error) {
 	ds, err := dsl.client.AppsV1().DaemonSets(dsl.namespace).Get(context.TODO(), dsl.name, metav1.GetOptions{})
 	if err != nil {
@@ -80,12 +90,16 @@ func (dsl *DaemonSetLock) Test(metadata interface{}) (holding bool, err error) {
 		if err := json.Unmarshal([]byte(valueString), &value); err != nil {
 			return false, err
 		}
-		return value.NodeID == dsl.nodeID, nil
+
+		if !ttlExpired(value.Created, value.TTL) {
+			return value.NodeID == dsl.nodeID, nil
+		}
 	}
 
 	return false, nil
 }
 
+// Release attempts to remove the lock data from the kured ds annotations using client-go
 func (dsl *DaemonSetLock) Release() error {
 	for {
 		ds, err := dsl.client.AppsV1().DaemonSets(dsl.namespace).Get(context.TODO(), dsl.name, metav1.GetOptions{})
@@ -99,6 +113,7 @@ func (dsl *DaemonSetLock) Release() error {
 			if err := json.Unmarshal([]byte(valueString), &value); err != nil {
 				return err
 			}
+
 			if value.NodeID != dsl.nodeID {
 				return fmt.Errorf("Not lock holder: %v", value.NodeID)
 			}
@@ -121,3 +136,10 @@ func (dsl *DaemonSetLock) Release() error {
 		return nil
 	}
 }
+
+func ttlExpired(created time.Time, ttl time.Duration) bool {
+	if ttl > 0 && time.Since(created) >= ttl {
+		return true
+	}
+	return false
+}

pkg/daemonsetlock/daemonsetlock_test.go

@@ -0,0 +1,28 @@
+package daemonsetlock
+
+import (
+	"testing"
+	"time"
+)
+
+func TestTtlExpired(t *testing.T) {
+	d := time.Date(2020, 05, 05, 14, 15, 0, 0, time.UTC)
+	second, _ := time.ParseDuration("1s")
+	zero, _ := time.ParseDuration("0m")
+
+	tests := []struct {
+		created time.Time
+		ttl     time.Duration
+		result  bool
+	}{
+		{d, second, true},
+		{time.Now(), second, false},
+		{d, zero, false},
+	}
+
+	for i, tst := range tests {
+		if ttlExpired(tst.created, tst.ttl) != tst.result {
+			t.Errorf("Test %d failed, expected %v but got %v", i, tst.result, !tst.result)
+		}
+	}
+}

pkg/delaytick/delaytick.go

@@ -5,7 +5,7 @@ import (
 	"time"
 )
 
-// Tick regularly after an initial delay randomly distributed between d/2 and d + d/2
+// New ticks regularly after an initial delay randomly distributed between d/2 and d + d/2
 func New(s rand.Source, d time.Duration) <-chan time.Time {
 	c := make(chan time.Time)
 

pkg/notifications/slack/slack.go

@@ -43,10 +43,12 @@ func notify(hookURL, username, channel, message string) error {
 	return nil
 }
 
-func NotifyDrain(hookURL, username, channel, nodeID string) error {
-	return notify(hookURL, username, channel, fmt.Sprintf("Draining node %s", nodeID))
+// NotifyDrain is the exposed way to notify of a drain event onto a slack chan
+func NotifyDrain(hookURL, username, channel, messageTemplate, nodeID string) error {
+	return notify(hookURL, username, channel, fmt.Sprintf(messageTemplate, nodeID))
 }
 
-func NotifyReboot(hookURL, username, channel, nodeID string) error {
-	return notify(hookURL, username, channel, fmt.Sprintf("Rebooting node %s", nodeID))
+// NotifyReboot is the exposed way to notify of a reboot event onto a slack chan
+func NotifyReboot(hookURL, username, channel, messageTemplate, nodeID string) error {
+	return notify(hookURL, username, channel, fmt.Sprintf(messageTemplate, nodeID))
 }

pkg/timewindow/days.go

@@ -7,6 +7,8 @@ import (
 	"time"
 )
 
+// EveryDay contains all days of the week, and exports it
+// for convenience use in the cmd line arguments.
 var EveryDay = []string{"su", "mo", "tu", "we", "th", "fr", "sa"}
 
 // dayStrings maps day strings to time.Weekdays
@@ -78,14 +80,12 @@ func parseWeekday(day string) (time.Weekday, error) {
 	if n, err := strconv.Atoi(day); err == nil {
 		if n >= 0 && n < 7 {
 			return time.Weekday(n), nil
-		} else {
-			return time.Sunday, fmt.Errorf("Invalid weekday, number out of range: %s", day)
 		}
+		return time.Sunday, fmt.Errorf("Invalid weekday, number out of range: %s", day)
 	}
 
 	if weekday, ok := dayStrings[strings.ToLower(day)]; ok {
 		return weekday, nil
-	} else {
-		return time.Sunday, fmt.Errorf("Invalid weekday: %s", day)
 	}
+	return time.Sunday, fmt.Errorf("Invalid weekday: %s", day)
 }

pkg/timewindow/timewindow.go

@@ -47,6 +47,19 @@ func (tw *TimeWindow) Contains(t time.Time) bool {
 	start := time.Date(loctime.Year(), loctime.Month(), loctime.Day(), tw.startTime.Hour(), tw.startTime.Minute(), tw.startTime.Second(), 0, tw.location)
 	end := time.Date(loctime.Year(), loctime.Month(), loctime.Day(), tw.endTime.Hour(), tw.endTime.Minute(), tw.endTime.Second(), 1e9-1, tw.location)
 
+	// Time Wrap validation
+	// First we check for start and end time, if start is after end time
+	// Next we need to validate if we want to wrap to the day before or to the day after
+	// For that we check the loctime value to see if it is before end time, we wrap with the day before
+	// Otherwise we wrap to the next day.
+	if tw.startTime.After(tw.endTime) {
+		if loctime.Before(end) {
+			start = start.Add(-24 * time.Hour)
+		} else {
+			end = end.Add(24 * time.Hour)
+		}
+	}
+
 	return (loctime.After(start) || loctime.Equal(start)) && (loctime.Before(end) || loctime.Equal(end))
 }
 

pkg/timewindow/timewindow_test.go

@@ -20,12 +20,12 @@ func TestTimeWindows(t *testing.T) {
 		cases []testcase
 	}{
 		{"mon,tue,wed,thu,fri", "9am", "5pm", "America/Los_Angeles", []testcase{
-			{"2019/04/04 00:49 PDT", false},
-			{"2019/04/05 08:59 PDT", false},
-			{"2019/04/05 9:01 PDT", true},
 			{"2019/03/31 10:00 PDT", false},
+			{"2019/04/04 00:49 PDT", false},
 			{"2019/04/04 12:00 PDT", true},
 			{"2019/04/04 11:59 UTC", false},
+			{"2019/04/05 08:59 PDT", false},
+			{"2019/04/05 9:01 PDT", true},
 		}},
 		{"mon,we,fri", "10:01", "11:30am", "America/Los_Angeles", []testcase{
 			{"2019/04/05 10:30 PDT", true},
@@ -40,6 +40,43 @@ func TestTimeWindows(t *testing.T) {
 			{"2019/04/18 00:00 UTC", true},
 			{"2019/04/18 23:59 UTC", true},
 		}},
+		{"mon,tue,wed,thu,fri", "9pm", "5am", "America/Los_Angeles", []testcase{
+			{"2019/03/30 04:00 PDT", false},
+			{"2019/03/31 10:00 PDT", false},
+			{"2019/03/31 22:00 PDT", false},
+			{"2019/04/04 00:49 PDT", true},
+			{"2019/04/04 12:00 PDT", false},
+			{"2019/04/04 22:49 PDT", true},
+			{"2019/04/05 00:49 PDT", true},
+			{"2019/04/05 08:59 PDT", false},
+			{"2019/04/05 9:01 PDT", false},
+		}},
+		{"mon,tue,wed,thu,fri", "11:59pm", "00:01am", "America/Los_Angeles", []testcase{
+			{"2019/04/04 23:58 PDT", false},
+			{"2019/04/04 23:59 PDT", true},
+			{"2019/04/05 00:00 PDT", true},
+			{"2019/04/05 00:01 PDT", true},
+			{"2019/04/05 00:02 PDT", false},
+		}},
+		{"mon,tue,wed,fri", "11:59pm", "00:01am", "America/Los_Angeles", []testcase{
+			{"2019/04/04 23:58 PDT", false},
+			{"2019/04/04 23:59 PDT", false}, // Even that this falls in the between the hours Thursday is not included so should not run
+			{"2019/04/05 00:00 PDT", true},
+			{"2019/04/05 00:02 PDT", false},
+		}},
+		{"mon,tue,wed,thu", "11:59pm", "00:01am", "America/Los_Angeles", []testcase{
+			{"2019/04/04 23:58 PDT", false},
+			{"2019/04/04 23:59 PDT", true},
+			{"2019/04/05 00:00 PDT", false}, // Even that this falls in the between the hours Friday is not included so should not run
+			{"2019/04/05 00:02 PDT", false},
+		}},
+		{"mon,tue,wed,thu,fri", "11:59pm", "00:01am", "UTC", []testcase{
+			{"2019/04/04 23:58 UTC", false},
+			{"2019/04/04 23:59 UTC", true},
+			{"2019/04/05 00:00 UTC", true},
+			{"2019/04/05 00:01 UTC", true},
+			{"2019/04/05 00:02 UTC", false},
+		}},
 	}
 
 	for i, tst := range tests {

tests/kind/create-reboot-sentinels.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+# USE KUBECTL_CMD to pass context and/or namespaces.
+KUBECTL_CMD="${KUBECTL_CMD:-kubectl}"
+SENTINEL_FILE="${SENTINEL_FILE:-/var/run/reboot-required}"
+
+echo "Creating reboot sentinel on all nodes"
+
+for nodename in $("$KUBECTL_CMD" get nodes -o name); do
+    docker exec "${nodename/node\//}" hostname
+    docker exec "${nodename/node\//}" touch "${SENTINEL_FILE}"
+done

tests/kind/follow-coordinated-reboot.sh

@@ -0,0 +1,85 @@
+#!/usr/bin/env bash
+
+NODECOUNT=${NODECOUNT:-5}
+KUBECTL_CMD="${KUBECTL_CMD:-kubectl}"
+DEBUG="${DEBUG:-false}"
+CONTAINER_NAME_FORMAT=${CONTAINER_NAME_FORMAT:-"chart-testing-*"}
+
+tmp_dir=$(mktemp -d -t kured-XXXX)
+function gather_logs_and_cleanup {
+    if [[ -f "$tmp_dir"/node_output ]]; then
+        rm "$tmp_dir"/node_output
+    fi
+    rmdir "$tmp_dir"
+
+    # The next commands are useful regardless of success or failures.
+    if [[ "$DEBUG" == "true" ]]; then
+        echo "############################################################"
+        # This is useful to see if containers have crashed.
+        echo "docker ps -a:"
+        docker ps -a
+	echo "docker journal logs"
+	journalctl -u docker --no-pager
+
+        # This is useful to see if the nodes have _properly_ rebooted.
+        # It should show the reboot/two container starts per node.
+        for name in $(docker ps -a -f "name=${CONTAINER_NAME_FORMAT}" -q); do
+            echo "############################################################"
+            echo "docker logs for container $name:"
+            docker logs "$name"
+        done
+
+    fi
+}
+trap gather_logs_and_cleanup EXIT
+
+declare -A was_unschedulable
+declare -A has_recovered
+max_attempts="60"
+sleep_time=60
+attempt_num=1
+
+set +o errexit
+echo "There are $NODECOUNT nodes in the cluster"
+until [ ${#was_unschedulable[@]} == "$NODECOUNT" ] && [ ${#has_recovered[@]} == "$NODECOUNT" ]
+do
+    echo "${#was_unschedulable[@]} nodes were removed from pool once:" "${!was_unschedulable[@]}"
+    echo "${#has_recovered[@]} nodes removed from the pool are now back:" "${!has_recovered[@]}"
+
+    "$KUBECTL_CMD" get nodes -o custom-columns=NAME:.metadata.name,SCHEDULABLE:.spec.unschedulable --no-headers > "$tmp_dir"/node_output
+    if [[ "$DEBUG" == "true" ]]; then
+        # This is useful to see if a node gets stuck after drain, and doesn't
+        # come back up.
+        echo "Result of command $KUBECTL_CMD get nodes ... showing unschedulable nodes:"
+        cat "$tmp_dir"/node_output
+    fi
+    while read -r node; do
+        unschedulable=$(echo "$node" | grep true | cut -f 1 -d ' ')
+        if [ -n "$unschedulable" ] && [ -z ${was_unschedulable["$unschedulable"]+x} ] ; then
+            echo "$unschedulable is now unschedulable!"
+            was_unschedulable["$unschedulable"]=1
+        fi
+        schedulable=$(echo "$node" | grep '<none>' | cut -f 1 -d ' ')
+        if [ -n "$schedulable" ] && [ ${was_unschedulable["$schedulable"]+x} ] && [ -z ${has_recovered["$schedulable"]+x} ]; then
+            echo "$schedulable has recovered!"
+            has_recovered["$schedulable"]=1
+        fi
+    done < "$tmp_dir"/node_output
+
+    if [[ "${#has_recovered[@]}" == "$NODECOUNT" ]]; then
+        echo "All nodes recovered."
+        break
+    else
+        if (( attempt_num == max_attempts ))
+        then
+            echo "Attempt $attempt_num failed and there are no more attempts left!"
+            exit 1
+        else
+            echo "Attempt $attempt_num failed! Trying again in $sleep_time seconds..."
+            sleep "$sleep_time"
+        fi
+    fi
+    (( attempt_num++ ))
+done
+
+echo "Test successful"