Merge pull request #291 from evrardjp/fix-tagging

Fix automated tagging
2026-03-13 06:10:25 +00:00 · 2021-01-11 14:29:28 +01:00 · 2021-01-11 14:23:14 +01:00 · 2021-01-11 11:51:20 +01:00 · 2021-01-11 11:39:54 +01:00 · 2021-01-11 11:26:23 +01:00
34 changed files with 1288 additions and 243 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,28 +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: /.*/
-           branches:
-             ignore: gh-pages
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -10,3 +10,8 @@ updates:
    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"
--- a/.github/kind-cluster-1.18.yaml
+++ b/.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
--- a/.github/kind-cluster-1.19.yaml
+++ b/.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
--- a/.github/kind-cluster-1.20.yaml
+++ b/.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"
--- a/.github/workflows/chart-lint.yml
+++ b/.github/workflows/chart-lint.yml
@@ -1,32 +0,0 @@
-name: lint-chart
-
-on:
-  pull_request:
-    paths:
-      - "charts/**"
-
-jobs:
-  lint-test:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-        with:
-          fetch-depth: "0"
-
-      - name: Run chart-testing (lint)
-        id: lint
-        uses: helm/chart-testing-action@v1.0.0
-        with:
-          command: lint
-          config: .github/ct.yaml
-
-      - name: Create kind cluster
-        uses: helm/kind-action@v1.0.0
-        if: steps.lint.outputs.changed == 'true'
-
-      - name: Run chart-testing (install)
-        uses: helm/chart-testing-action@v1.0.0
-        with:
-          command: install
-          config: .github/ct.yaml
--- a/.github/workflows/check-links.yaml
+++ b/.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 }}
-
--- a/.github/workflows/go-lint.yaml
+++ b/.github/workflows/go-lint.yaml
@@ -1,16 +0,0 @@
-name: "Go lint"
-on: [pull_request, push]
-
-jobs:
-  code-lint:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v1
-    - 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/...'
--- a/.github/workflows/on-master-push-charts.yaml
+++ b/.github/workflows/on-master-push-charts.yaml
@@ -1,11 +1,14 @@
-name: release-chart
+name: Publish helm chart
 on:
  push:
-    tags:
-      - "*"
+    branches:
+      - "master"
+    paths:
+      - "charts/**"

 jobs:
-  publish:
+  publish-helm-chart:
+    name: Publish latest chart
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
--- a/.github/workflows/on-master-push.yaml
+++ b/.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
--- a/.github/workflows/on-pr-charts.yaml
+++ b/.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 ${{ matrix.test-action }} --config .github/ct.yaml
--- a/.github/workflows/on-pr.yaml
+++ b/.github/workflows/on-pr.yaml
@@ -0,0 +1,197 @@
+name: PR
+on:
+  pull_request:
+  push:
+
+jobs:
+  pr-shellcheck:
+    name: Lint bash code with shellcheck
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Run ShellCheck
+      uses: bewuethr/shellcheck-action@v2
+
+  pr-lint-code:
+    name: Lint golang code
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Find go version
+      run: |
+        GO_VERSION=$(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'"
--- a/.github/workflows/on-tag.yaml
+++ b/.github/workflows/on-tag.yaml
@@ -0,0 +1,42 @@
+# 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: "${{ steps.awk_gomod.outputs.version }}"
+      - name: Find current tag version
+        run: echo "::set-output name=version::${GITHUB_REF#refs/tags/}"
+        id: tags
+      - run: |
+          make DH_ORG="${{ github.repository_owner }}" VERSION="${{ steps.tags.outputs.version }}" image
+      - uses: Azure/container-scan@v0
+        with:
+          image-name: docker.io/${{ github.repository_owner }}/kured:${{ steps.tags.outputs.version }}
+
+      - 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="${{ steps.tags.outputs.version }}" publish-image
--- a/.github/workflows/periodics-daily.yaml
+++ b/.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/${{ github.repository_owner }}/kured:master --name chart-testing
+
+      - name: Deploy kured on default namespace with its helm chart
+        run: |
+          # Documented in official helm doc to live on the edge
+          curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash
+          # Refresh bins
+          hash -r
+          helm install kured ./charts/kured/ --set configuration.period=1m
+          kubectl config set-context kind-chart-testing
+          kubectl get ds --all-namespaces
+          kubectl describe ds kured
+
+      - name: Ensure kured is ready
+        uses: nick-invision/retry@v2.4.0
+        with:
+          timeout_minutes: 10
+          max_attempts: 10
+          retry_wait_seconds: 60
+          # DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE should all be = 5
+          command: "kubectl get ds kured | grep -E 'kured.*5.*5.*5.*5.*5' "
+
+      - name: Create reboot sentinel files
+        run: |
+          ./tests/kind/create-reboot-sentinels.sh
+
+      - name: Follow reboot until success
+        env:
+          DEBUG: true
+        run: |
+          ./tests/kind/follow-coordinated-reboot.sh
--- a/.github/workflows/vulnerability-scan.yaml
+++ b/.github/workflows/vulnerability-scan.yaml
@@ -1,14 +0,0 @@
-# This should not be made a mandatory test
-# It is only used to make us aware of any potential security failure, that
-# should trigger a bump of the image in build/.
-name: "Image vulnerability scan"
-on: [push, pull_request]
-jobs:
-  build-and-scan:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@master
-      - run: make DH_ORG="${{ github.repository_owner }}" VERSION="${{ github.sha }}" image
-      - uses: Azure/container-scan@v0
-        with:
-          image-name: docker.io/${{ github.repository_owner }}/kured:${{ github.sha }}
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -31,8 +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
@@ -47,8 +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
@@ -57,6 +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
@@ -74,39 +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"
 ```
-
-To make this available for our Helm users, please make sure you update the
-image version in
-
- `charts/kured/values.yaml` (`tag`),
- `charts/kured/Chart.yaml` (`appVersion`) and
- `charts/kured/README.md` (`image.tag`) as well.
-
-Finally bump the `version` in `charts/kured/Chart.yaml` and you should be
-all set.
+### 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.
--- a/README.md
+++ b/README.md
@@ -45,7 +45,8 @@ server:

 | kured  | kubectl | k8s.io/client-go | k8s.io/apimachinery | expected kubernetes compatibility |
 |--------|---------|------------------|---------------------|-----------------------------------|
-| master | 1.18.8  | v0.18.8          | v0.18.8             | 1.17.x, 1.18.x, 1.19.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            |
@@ -94,6 +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")
 ```
@@ -116,10 +119,10 @@ reboots to predictable schedules.  Use `--reboot-days`, `--start-time`,
 hours on the west coast USA can be specified with:

 ```console
-  --reboot-days mon,tue,wed,thu,fri
-  --start-time 9am
-  --end-time 5pm
-  --time-zone America/Los_Angeles
+  --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`,
@@ -218,6 +221,11 @@ you immediately prior to rebooting a node:
 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
@@ -276,8 +284,7 @@ Using `--lock-ttl=30m` will allow other nodes to take over if TTL has expired (i

 ## 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:
@@ -294,6 +301,8 @@ make
 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.

--- a/charts/kured/Chart.yaml
+++ b/charts/kured/Chart.yaml
@@ -2,7 +2,7 @@ apiVersion: v1
 appVersion: "1.5.1"
 description: A Helm chart for kured
 name: kured
-version: 2.2.1
+version: 2.2.3
 home: https://github.com/weaveworks/kured
 maintainers:
  - name: ckotzbauer
--- a/charts/kured/README.md
+++ b/charts/kured/README.md
@@ -55,6 +55,8 @@ The following changes have been made compared to the stable chart:
 | `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`                     |
@@ -86,7 +88,7 @@ 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. 
+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

--- a/charts/kured/templates/clusterrole.yaml
+++ b/charts/kured/templates/clusterrole.yaml
@@ -10,7 +10,7 @@ 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/v1.18.8/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"]
--- a/charts/kured/templates/daemonset.yaml
+++ b/charts/kured/templates/daemonset.yaml
@@ -81,6 +81,12 @@ spec:
          {{- 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 }}
@@ -96,7 +102,7 @@ spec:
          {{- end }}
          ports:
            - containerPort: 8080
-              name: metrics          
+              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
--- a/charts/kured/values.minikube.yaml
+++ b/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)
--- a/charts/kured/values.yaml
+++ b/charts/kured/values.yaml
@@ -20,20 +20,22 @@ extraEnvVars:
 #    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")
-  startTime: ""             # only reboot after this time of day (default "0:00")
-  timeZone: ""              # time-zone to use (valid zones from "time" golang package)
+  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
--- a/cmd/kured/Dockerfile
+++ b/cmd/kured/Dockerfile
@@ -1,4 +1,4 @@
 FROM alpine:3.12
-RUN apk add --no-cache ca-certificates tzdata
+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"]
--- a/cmd/kured/main.go
+++ b/cmd/kured/main.go
@@ -31,18 +31,20 @@ var (
 	version = "unreleased"

 	// Command line flags
-	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
-	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
@@ -90,6 +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")
@@ -237,7 +243,7 @@ func drain(client *kubernetes.Clientset, node *v1.Node) {
 	log.Infof("Draining node %s", nodename)

 	if slackHookURL != "" {
-		if err := slack.NotifyDrain(slackHookURL, slackUsername, slackChannel, nodename); err != nil {
+		if err := slack.NotifyDrain(slackHookURL, slackUsername, slackChannel, messageTemplateDrain, nodename); err != nil {
 			log.Warnf("Error notifying slack: %v", err)
 		}
 	}
@@ -277,7 +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)
 		}
 	}
--- a/go.mod
+++ b/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/prometheus/client_golang v1.0.0
-	github.com/prometheus/common v0.4.1
-	github.com/sirupsen/logrus v1.4.2
-	github.com/spf13/cobra v0.0.5
-	k8s.io/api v0.18.8
-	k8s.io/apimachinery v0.18.8
-	k8s.io/client-go v0.18.8
-	k8s.io/kubectl v0.18.8
+	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
 )
--- a/go.sum
+++ b/go.sum
@@ -1,67 +1,147 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.51.0/go.mod h1:hWtGJ6gnXH+KgDv+V0zFGDvpi07n3z8ZNj3T1RW0Gcw=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
 github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
+github.com/Azure/go-autorest/autorest v0.9.6/go.mod h1:/FALq9T/kS7b5J5qsQ+RSTUdAmGFqi0vUdVNNx8q630=
 github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
+github.com/Azure/go-autorest/autorest/adal v0.8.2/go.mod h1:ZjhuQClTqx435SRJ2iMlOxPYt3d2C/T/7TiQCVZSn3Q=
 github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA=
+github.com/Azure/go-autorest/autorest/date v0.2.0/go.mod h1:vcORJHLJEh643/Ioh9+vPmf1Ij9AEBM5FuBIXLmIy0g=
 github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
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--- a/kured-ds.yaml
+++ b/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
--- a/kured-rbac.yaml
+++ b/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/v1.18.8/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"]
--- a/pkg/notifications/slack/slack.go
+++ b/pkg/notifications/slack/slack.go
@@ -44,11 +44,11 @@ func notify(hookURL, username, channel, message string) error {
 }

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

 // NotifyReboot is the exposed way to notify of a reboot event onto a slack chan
-func NotifyReboot(hookURL, username, channel, nodeID string) error {
-	return notify(hookURL, username, channel, fmt.Sprintf("Rebooting node %s", nodeID))
+func NotifyReboot(hookURL, username, channel, messageTemplate, nodeID string) error {
+	return notify(hookURL, username, channel, fmt.Sprintf(messageTemplate, nodeID))
 }
--- a/pkg/timewindow/timewindow.go
+++ b/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))
 }

--- a/pkg/timewindow/timewindow_test.go
+++ b/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 {
--- a/tests/kind/create-reboot-sentinels.sh
+++ b/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 "${SENTINEL_FILE}"
+done
--- a/tests/kind/follow-coordinated-reboot.sh
+++ b/tests/kind/follow-coordinated-reboot.sh
@@ -0,0 +1,85 @@
+#!/usr/bin/env bash
+
+NODECOUNT=${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"