Merge pull request #192 from dholbach/prep-1.5.0-release

Prepare 1.5.0 release
2026-02-15 01:39:50 +00:00 · 2020-09-01 15:08:10 +02:00 · 2020-09-01 11:38:17 +02:00 · 2020-09-01 10:59:14 +02:00 · 2020-09-01 10:58:07 +02:00 · 2020-09-01 08:53:51 +00:00
40 changed files with 2124 additions and 582 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,20 +1,28 @@
 version: 2
 jobs:
  build:
-    working_directory: /go/src/github.com/weaveworks/kured
    docker:
-      - image: circleci/golang:1.8
+      - image: cimg/go:1.13
    steps:
      - checkout
      - setup_remote_docker
-      - run: go get github.com/golang/dep/cmd/dep
-      - run: dep ensure
-      - run: make
-
      - deploy:
-          name: Maybe push master images
+          name: Build and push image
          command: |
-            if [ -z "${CIRCLE_TAG}" -a "${CIRCLE_BRANCH}" == "master" ]; then
-              docker login -u "$DOCKER_USER" -p "$DOCKER_PASS" quay.io
-              make publish-image
+            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/ct.yaml
+++ b/.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
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -0,0 +1,12 @@
+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"
--- a/.github/workflows/chart-lint.yml
+++ b/.github/workflows/chart-lint.yml
@@ -0,0 +1,32 @@
+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/chart-release.yml
+++ b/.github/workflows/chart-release.yml
@@ -0,0 +1,16 @@
+name: release-chart
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  publish:
+    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
--- a/.github/workflows/check-links.yaml
+++ b/.github/workflows/check-links.yaml
@@ -0,0 +1,16 @@
+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/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -0,0 +1,113 @@
+# Developing `kured`
+
+We love contributions to `kured`, no matter if you are [helping out on
+Slack][slack], reporting or triaging [issues][issues] or contributing code
+to `kured`.
+
+In any case, it will make sense to familiarise yourself with the main
+[README][readme] to understand the different features and options, which is
+helpful for testing. The "building" section in particular makes sense if
+you are planning to contribute code.
+
+[slack]: README.md#getting-help
+[issues]: https://github.com/weaveworks/kured/issues
+[readme]: README.md
+
+## 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.
+
+This is what it took to support Kubernetes 1.14:
+<https://github.com/weaveworks/kured/pull/75>
+
+That the process can be more involved that that can be seen in
+<https://github.com/weaveworks/kured/commits/support-k8s-1.10>
+
+Once you updated everything, make sure you update the support matrix on
+the main [README][readme] as well.
+
+## Release testing
+
+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.
+
+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
+results, if you login to a node and run:
+
+```console
+sudo touch /var/run/reboot-required
+```
+
+### Testing with `minikube`
+
+A test-run with `minikube` could look like this:
+
+```console
+minikube start --vm-driver kvm2 --kubernetes-version <k8s-release>
+
+# edit kured-ds.yaml to
+#   - point to new image
+#   - change e.g. period and reboot-days option for immediate results
+
+minikube kubectl -- apply -f kured-rbac.yaml
+minikube kubectl -- apply -f kured-ds.yaml
+minikube kubectl -- logs daemonset.apps/kured -n kube-system -f
+
+# In separate terminal
+minikube ssh
+ sudo touch /var/run/reboot-required
+minikube logs -f
+```
+
+Now check for the 'Commanding reboot' message and minikube going down.
+
+Unfortunately as of today, you are going to run into
+<https://github.com/kubernetes/minikube/issues/2874>. This means that
+minikube won't come back easily. You will need to start minikube again.
+Then you can check for the lock release.
+
+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.
+
+## Publishing a new kured release
+
+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.
+
+Now create the `kured-<release>-dockerhub.yaml` for e.g. `1.3.0`:
+
+```sh
+VERSION=1.3.0
+MANIFEST="kured-$VERSION-dockerhub.yaml"
+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.
+
+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.)
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -1,431 +0,0 @@
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-    "pkg/util/parsers",
-    "pkg/version",
-    "rest",
-    "rest/watch",
-    "tools/clientcmd/api",
-    "tools/metrics",
-    "transport",
-    "util/cert",
-    "util/flowcontrol",
-    "util/integer"
-  ]
-  revision = "d92e8497f71b7b4e0494e5bd204b48d34bd6f254"
-  version = "v4.0.0"
-
-[solve-meta]
-  analyzer-name = "dep"
-  analyzer-version = 1
-  inputs-digest = "029e6d2251ccbf5acdfc3bc0c36f340dc3a98511b0d7338c3e9bb167e412a155"
-  solver-name = "gps-cdcl"
-  solver-version = 1
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -1,24 +0,0 @@
-
-[[constraint]]
-  name = "github.com/sirupsen/logrus"
-  version = "v1.0.5"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/prometheus/client_golang"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/prometheus/common"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/spf13/cobra"
-
-[[constraint]]
-  name = "k8s.io/client-go"
-  version = "v4.0.0"
-
-[[constraint]]
-  name = "k8s.io/apimachinery"
-  branch = "release-1.7"
--- a/11
+++ b/11
@@ -3,15 +3,15 @@

 DH_ORG=weaveworks
 VERSION=$(shell git symbolic-ref --short HEAD)-$(shell git rev-parse --short HEAD)
+SUDO=$(shell docker info >/dev/null 2>&1 || echo "sudo -E")

 all: image

 clean:
-	go clean
 	rm -f cmd/kured/kured
 	rm -rf ./build

-godeps=$(shell go get $1 && go list -f '{{join .Deps "\n"}}' $1 | grep -v /vendor/ | xargs go list -f '{{if not .Standard}}{{ $$dep := . }}{{range .GoFiles}}{{$$dep.Dir}}/{{.}} {{end}}{{end}}')
+godeps=$(shell go list -f '{{join .Deps "\n"}}' $1 | grep -v /vendor/ | xargs go list -f '{{if not .Standard}}{{ $$dep := . }}{{range .GoFiles}}{{$$dep.Dir}}/{{.}} {{end}}{{end}}')

 DEPS=$(call godeps,./cmd/kured)

@@ -22,13 +22,14 @@ cmd/kured/kured: cmd/kured/*.go
 build/.image.done: cmd/kured/Dockerfile cmd/kured/kured
 	mkdir -p build
 	cp $^ build
-	sudo -E docker build -t quay.io/$(DH_ORG)/kured:$(VERSION) -f build/Dockerfile ./build
+	$(SUDO) docker build -t docker.io/$(DH_ORG)/kured -f build/Dockerfile ./build
+	$(SUDO) docker tag docker.io/$(DH_ORG)/kured docker.io/$(DH_ORG)/kured:$(VERSION)
 	touch $@

 image: build/.image.done

 publish-image: image
-	sudo -E docker push quay.io/$(DH_ORG)/kured:$(VERSION)
+	$(SUDO) docker push docker.io/$(DH_ORG)/kured:$(VERSION)

 minikube-publish: image
-	sudo -E docker save quay.io/$(DH_ORG)/kured:$(VERSION) | (eval $$(minikube docker-env) && docker load)
+	$(SUDO) docker save docker.io/$(DH_ORG)/kured | (eval $$(minikube docker-env) && docker load)
--- a/README.md
+++ b/README.md
@@ -1,20 +1,26 @@

+# 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)
-	* [Blocking Reboots via Alerts](#blocking-reboots-via-alerts)
-	* [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)

 ## Introduction
@@ -26,30 +32,41 @@ indicated by the package management system of the underlying OS.
 * Watches for the presence of a reboot sentinel e.g. `/var/run/reboot-required`
 * Utilises a lock in the API server to ensure only one node reboots at
  a time
-* Optionally defers reboots in the presence of active Prometheus alerts
+* Optionally defers reboots in the presence of active Prometheus alerts or selected pods
 * Cordons & drains worker nodes before reboot, uncordoning them after

 ## Kubernetes & OS Compatibility

-The daemon image contains a 1.7.x `k8s.io/client-go` and `kubectl`
-binary for the purposes of maintaining the lock and draining worker
-nodes. Whilst it has only been tested on a 1.7.x cluster, Kubernetes
-typically has good forwards/backwards compatibility so there is a
-reasonable chance it will work on adjacent versions; please file an
-issue if this is not the case.
+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:

-Additionally, the image contains a `systemctl` binary from Ubuntu
-16.04 in order to command reboots. Again, although this has not been
-tested against other systemd distributions there is a good chance that
-it will work.
+| 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            |
+| 1.5.0  | 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               |
+
+See the [release notes](https://github.com/weaveworks/kured/releases)
+for specific version compatibility information, including which
+combination have been formally tested.
+
+Versions >=1.1.0 enter the host mount namespace to invoke
+`systemctl reboot`, so should work on any systemd distribution.

 ## Installation

 To obtain a default installation without Prometheus alerting interlock
 or Slack notifications:

-```
-kubectl apply -f https://github.com/weaveworks/kured/releases/download/1.0.0/kured-ds.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
@@ -59,17 +76,25 @@ 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:
-      --alert-filter-regexp value   alert names to ignore when checking for active alerts
-      --ds-name string              namespace containing daemonset on which to place lock (default "kube-system")
-      --ds-namespace string         name of daemonset on which to place lock (default "kured")
-      --lock-annotation string      annotation in which to record locking node (default "weave.works/kured-node-lock")
-      --period duration             reboot check period (default 1h0m0s)
-      --prometheus-url string       Prometheus instance to probe for active alerts
-      --reboot-sentinel string      path to file whose existence signals need to reboot (default "/var/run/reboot-required")
-      --slack-hook-url string       slack hook URL for reboot notfications
-      --slack-username string       slack username for reboot notfications (default "kured")
+      --annotation-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")
+      --ds-namespace string                 namespace containing daemonset on which to place lock (default "kube-system")
+      --end-time string                     only reboot before this time of day (default "23:59")
+  -h, --help                                help for kured
+      --lock-annotation string              annotation in which to record locking node (default "weave.works/kured-node-lock")
+      --period duration                     reboot check period (default 1h0m0s)
+      --prometheus-url string               Prometheus instance to probe for active alerts
+      --reboot-days strings                 only reboot on these days (default [su,mo,tu,we,th,fr,sa])
+      --reboot-sentinel string              path to file whose existence signals need to reboot (default "/var/run/reboot-required")
+      --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")
+      --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")
 ```

 ### Reboot Sentinel File & Period
@@ -80,32 +105,80 @@ values with `--reboot-sentinel` and `--period`. Each replica of the
 daemon uses a random offset derived from the period on startup so that
 nodes don't all contend for the lock simultaneously.

+### Setting a schedule
+
+By default, kured will reboot any time it detects the sentinel, but this
+may cause reboots during odd hours.  While service disruption does not
+normally occur, anything is possible and operators may want to restrict
+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:
+
+```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`,
+and `17`.  `--time-zone` represents a Go `time.Location`, and can be `UTC`,
+`Local`, or any entry in the standard Linux tz database.
+
+Note that when using smaller time windows, you should consider shortening
+the sentinel check period (`--period`).
+
 ### Blocking Reboots via Alerts

 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|...$
 ```

-An important application of this filter will become apparent in the
-next section.
+See the section on Prometheus metrics for an important application of this
+filter.
+
+### Blocking Reboots via Pods
+
+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
+```
+
+In this case, the presence of either an (appropriately labelled) expensive long
+running job or a known temperamental pod on a node will stop it rebooting.
+
+> Try not to abuse this mechanism - it's better to strive for
+> restartability where possible. If you do use it, make sure you set
+> up a RebootRequired alert as described in the next section so that
+> you can intervene manually if reboots are blocked for too long.

 ### Prometheus Metrics

 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
@@ -115,7 +188,7 @@ 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.
@@ -139,7 +212,7 @@ 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`.
@@ -165,7 +238,7 @@ 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
 ```

@@ -174,7 +247,7 @@ 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"}'
 ```

@@ -186,25 +259,63 @@ 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 `--annotation-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
+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
 ```
-dep ensure && make
+
+**Building inside $GOPATH:**
+
+```console
+GO111MODULE=on make
 ```

+If you are interested in contributing code to kured, please take a look at
+our [development][development] docs.
+
+[development]: DEVELOPMENT.md
+
+## Frequently Asked/Anticipated Questions
+
+### Why is there no `latest` tag on Docker Hub?
+
+Use of `latest` for production deployments is bad practice - see
+[here](https://kubernetes.io/docs/concepts/configuration/overview) for
+details. The manifest on `master` refers to `latest` for local
+development testing with minikube only; for production use choose a
+versioned manifest from the [release page](https://github.com/weaveworks/kured/releases/).
+
 ## Getting Help

 If you have any questions about, feedback for or problems with `kured`:

- Invite yourself to the <a href="https://weaveworks.github.io/community-slack/" target="_blank"> #weave-community </a> slack channel.
- Ask a question on the <a href="https://weave-community.slack.com/messages/general/"> #weave-community</a> slack channel.
- Send an email to <a href="mailto:weave-users@weave.works">weave-users@weave.works</a>
- <a href="https://github.com/weaveworks/kured/issues/new">File an issue.</a>
+* 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!
--- a/charts/kured/.helmignore
+++ b/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
--- a/charts/kured/Chart.yaml
+++ b/charts/kured/Chart.yaml
@@ -0,0 +1,14 @@
+apiVersion: v1
+appVersion: "1.5.0"
+description: A Helm chart for kured
+name: kured
+version: 2.2.0
+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
--- a/charts/kured/README.md
+++ b/charts/kured/README.md
@@ -0,0 +1,106 @@
+# 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                                                                   | `1.5.0`                    |
+| `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.annotationTtl` | cli-parameter `--annotation-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.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"
+```
--- a/charts/kured/templates/NOTES.txt
+++ b/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.
--- a/charts/kured/templates/_helpers.tpl
+++ b/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 -}}
--- a/charts/kured/templates/clusterrole.yaml
+++ b/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/v1.18.8/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 -}}
--- a/charts/kured/templates/clusterrolebinding.yaml
+++ b/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 -}}
--- a/charts/kured/templates/daemonset.yaml
+++ b/charts/kured/templates/daemonset.yaml
@@ -0,0 +1,121 @@
+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.annotationTtl }}
+            - --annotation-ttl={{ .Values.configuration.annotationTtl }}
+          {{- end }}
+          {{- if .Values.configuration.alertFilterRegexp }}
+            - --alert-filter-regexp={{ .Values.configuration.alertFilterRegexp | quote }}
+          {{- 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.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 }}
--- a/charts/kured/templates/podsecuritypolicy.yaml
+++ b/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 }}
--- a/charts/kured/templates/role.yaml
+++ b/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 -}}
--- a/charts/kured/templates/rolebinding.yaml
+++ b/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 -}}
--- a/charts/kured/templates/service.yaml
+++ b/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 }}
--- a/charts/kured/templates/serviceaccount.yaml
+++ b/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 -}}
--- a/charts/kured/templates/servicemonitor.yaml
+++ b/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 }}
--- a/charts/kured/values.yaml
+++ b/charts/kured/values.yaml
@@ -0,0 +1,70 @@
+image:
+  repository: weaveworks/kured
+  tag: 1.5.0
+  pullPolicy: IfNotPresent
+  pullSecrets: []
+
+updateStrategy: OnDelete
+
+podAnnotations: {}
+
+extraArgs: {}
+
+extraEnvVars:
+#  - name: slackHookUrl
+#    valueFrom:
+#      secretKeyRef:
+#        name: secret_name
+#        key: secret_key
+#  - name: regularEnvVariable
+#    value: 123
+
+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: ""                # 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)
+
+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: {}
--- a/cmd/kured/Dockerfile
+++ b/cmd/kured/Dockerfile
@@ -1,6 +1,7 @@
-FROM ubuntu:16.04
-RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/cache/apt
-ADD https://storage.googleapis.com/kubernetes-release/release/v1.9.6/bin/linux/amd64/kubectl /usr/bin/kubectl
+FROM alpine:3.12
+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/v1.18.8/bin/linux/amd64/kubectl /usr/bin/kubectl
 RUN chmod 0755 /usr/bin/kubectl
 COPY ./kured /usr/bin/kured
 ENTRYPOINT ["/usr/bin/kured"]
--- a/cmd/kured/main.go
+++ b/cmd/kured/main.go
@@ -1,6 +1,8 @@
 package main

 import (
+	"context"
+	"fmt"
 	"math/rand"
 	"net/http"
 	"os"
@@ -20,6 +22,7 @@ import (
 	"github.com/weaveworks/kured/pkg/daemonsetlock"
 	"github.com/weaveworks/kured/pkg/delaytick"
 	"github.com/weaveworks/kured/pkg/notifications/slack"
+	"github.com/weaveworks/kured/pkg/timewindow"
 )

 var (
@@ -35,6 +38,15 @@ var (
 	rebootSentinel string
 	slackHookURL   string
 	slackUsername  string
+	slackChannel   string
+	podSelectors   []string
+
+	rebootDays  []string
+	rebootStart string
+	rebootEnd   string
+	timezone    string
+
+	annotationTTL time.Duration

 	// Metrics
 	rebootRequiredGauge = prometheus.NewGaugeVec(prometheus.GaugeOpts{
@@ -73,6 +85,23 @@ func main() {
 		"slack hook URL for reboot notfications")
 	rootCmd.PersistentFlags().StringVar(&slackUsername, "slack-username", "kured",
 		"slack username for reboot notfications")
+	rootCmd.PersistentFlags().StringVar(&slackChannel, "slack-channel", "",
+		"slack channel for reboot notfications")
+
+	rootCmd.PersistentFlags().StringArrayVar(&podSelectors, "blocking-pod-selector", nil,
+		"label selector identifying pods whose presence should prevent reboots")
+
+	rootCmd.PersistentFlags().StringSliceVar(&rebootDays, "reboot-days", timewindow.EveryDay,
+		"schedule reboot on these days")
+	rootCmd.PersistentFlags().StringVar(&rebootStart, "start-time", "0:00",
+		"schedule reboot only after this time of day")
+	rootCmd.PersistentFlags().StringVar(&rebootEnd, "end-time", "23:59:59",
+		"schedule reboot only before this time of day")
+	rootCmd.PersistentFlags().StringVar(&timezone, "time-zone", "UTC",
+		"use this timezone for schedule inputs")
+
+	rootCmd.PersistentFlags().DurationVar(&annotationTTL, "annotation-ttl", 0,
+		"force clean annotation after this ammount of time (default 0, disabled)")

 	if err := rootCmd.Execute(); err != nil {
 		log.Fatal(err)
@@ -97,16 +126,23 @@ func newCommand(name string, arg ...string) *exec.Cmd {
 }

 func sentinelExists() bool {
-	_, err := os.Stat(rebootSentinel)
-	switch {
-	case err == nil:
-		return true
-	case os.IsNotExist(err):
-		return false
-	default:
-		log.Fatalf("Unable to determine existence of sentinel: %v", err)
-		return false // unreachable; prevents compilation error
+	// Relies on hostPID:true and privileged:true to enter host mount space
+	sentinelCmd := newCommand("/usr/bin/nsenter", "-m/proc/1/ns/mnt", "--", "/usr/bin/test", "-f", rebootSentinel)
+	if err := sentinelCmd.Run(); err != nil {
+		switch err := err.(type) {
+		case *exec.ExitError:
+			// We assume a non-zero exit code means 'reboot not required', but of course
+			// the user could have misconfigured the sentinel command or something else
+			// went wrong during its execution. In that case, not entering a reboot loop
+			// is the right thing to do, and we are logging stdout/stderr of the command
+			// so it should be obvious what is wrong.
+			return false
+		default:
+			// Something was grossly misconfigured, such as the command path being wrong.
+			log.Fatalf("Error invoking sentinel command: %v", err)
+		}
 	}
+	return true
 }

 func rebootRequired() bool {
@@ -119,7 +155,7 @@ func rebootRequired() bool {
 	}
 }

-func rebootBlocked() bool {
+func rebootBlocked(client *kubernetes.Clientset, nodeID string) bool {
 	if prometheusURL != "" {
 		alertNames, err := alerts.PrometheusActiveAlerts(prometheusURL, alertFilter)
 		if err != nil {
@@ -135,6 +171,31 @@ func rebootBlocked() bool {
 			return true
 		}
 	}
+
+	fieldSelector := fmt.Sprintf("spec.nodeName=%s", nodeID)
+	for _, labelSelector := range podSelectors {
+		podList, err := client.CoreV1().Pods("").List(context.TODO(), metav1.ListOptions{
+			LabelSelector: labelSelector,
+			FieldSelector: fieldSelector,
+			Limit:         10})
+		if err != nil {
+			log.Warnf("Reboot blocked: pod query error: %v", err)
+			return true
+		}
+
+		if len(podList.Items) > 0 {
+			podNames := make([]string, 0, len(podList.Items))
+			for _, pod := range podList.Items {
+				podNames = append(podNames, pod.Name)
+			}
+			if len(podList.Continue) > 0 {
+				podNames = append(podNames, "...")
+			}
+			log.Warnf("Reboot blocked: matching pods: %v", podNames)
+			return true
+		}
+	}
+
 	return false
 }

@@ -149,8 +210,8 @@ 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)
@@ -173,6 +234,13 @@ func release(lock *daemonsetlock.DaemonSetLock) {

 func drain(nodeID string) {
 	log.Infof("Draining node %s", nodeID)
+
+	if slackHookURL != "" {
+		if err := slack.NotifyDrain(slackHookURL, slackUsername, slackChannel, nodeID); err != nil {
+			log.Warnf("Error notifying slack: %v", err)
+		}
+	}
+
 	drainCmd := newCommand("/usr/bin/kubectl", "drain",
 		"--ignore-daemonsets", "--delete-local-data", "--force", nodeID)

@@ -190,16 +258,16 @@ func uncordon(nodeID string) {
 }

 func commandReboot(nodeID string) {
-	log.Infof("Commanding reboot")
+	log.Infof("Commanding reboot for node: %s", nodeID)

 	if slackHookURL != "" {
-		if err := slack.NotifyReboot(slackHookURL, slackUsername, nodeID); err != nil {
+		if err := slack.NotifyReboot(slackHookURL, slackUsername, slackChannel, nodeID); err != nil {
 			log.Warnf("Error notifying slack: %v", err)
 		}
 	}

-	// Relies on /var/run/dbus/system_bus_socket bind mount to talk to systemd
-	rebootCmd := newCommand("/bin/systemctl", "reboot")
+	// Relies on hostPID:true and privileged:true to enter host mount space
+	rebootCmd := newCommand("/usr/bin/nsenter", "-m/proc/1/ns/mnt", "/bin/systemctl", "reboot")
 	if err := rebootCmd.Run(); err != nil {
 		log.Fatalf("Error invoking reboot command: %v", err)
 	}
@@ -221,7 +289,7 @@ type nodeMeta struct {
 	Unschedulable bool `json:"unschedulable"`
 }

-func rebootAsRequired(nodeID string) {
+func rebootAsRequired(nodeID string, window *timewindow.TimeWindow, TTL time.Duration) {
 	config, err := rest.InClusterConfig()
 	if err != nil {
 		log.Fatal(err)
@@ -245,14 +313,14 @@ func rebootAsRequired(nodeID string) {
 	source := rand.NewSource(time.Now().UnixNano())
 	tick := delaytick.New(source, period)
 	for _ = range tick {
-		if rebootRequired() && !rebootBlocked() {
-			node, err := client.CoreV1().Nodes().Get(nodeID, metav1.GetOptions{})
+		if window.Contains(time.Now()) && rebootRequired() && !rebootBlocked(client, nodeID) {
+			node, err := client.CoreV1().Nodes().Get(context.TODO(), nodeID, metav1.GetOptions{})
 			if err != nil {
 				log.Fatal(err)
 			}
 			nodeMeta.Unschedulable = node.Spec.Unschedulable

-			if acquire(lock, &nodeMeta) {
+			if acquire(lock, &nodeMeta, TTL) {
 				if !nodeMeta.Unschedulable {
 					drain(nodeID)
 				}
@@ -274,11 +342,23 @@ func root(cmd *cobra.Command, args []string) {
 		log.Fatal("KURED_NODE_ID environment variable required")
 	}

+	window, err := timewindow.New(rebootDays, rebootStart, rebootEnd, timezone)
+	if err != nil {
+		log.Fatalf("Failed to build time window: %v", err)
+	}
+
 	log.Infof("Node ID: %s", nodeID)
 	log.Infof("Lock Annotation: %s/%s:%s", dsNamespace, dsName, lockAnnotation)
 	log.Infof("Reboot Sentinel: %s every %v", rebootSentinel, period)
+	log.Infof("Blocking Pod Selectors: %v", podSelectors)
+	log.Infof("Reboot on: %v", window)
+	if annotationTTL > 0 {
+		log.Infof("Force annotation cleanup after: %v", annotationTTL)
+	} else {
+		log.Info("Force annotation cleanup disabled.")
+	}

-	go rebootAsRequired(nodeID)
+	go rebootAsRequired(nodeID, window, annotationTTL)
 	go maintainRebootRequiredMetric(nodeID)

 	http.Handle("/metrics", promhttp.Handler())
--- a/go.mod
+++ b/go.mod
@@ -0,0 +1,15 @@
+module github.com/weaveworks/kured
+
+go 1.13
+
+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 v0.18.8
+	k8s.io/client-go v0.18.8
+)
--- a/go.sum
+++ b/go.sum
@@ -0,0 +1,600 @@
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--- a/kured-ds.yaml
+++ b/kured-ds.yaml
@@ -1,32 +1,40 @@
-apiVersion: extensions/v1beta1
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: kured
+  namespace: kube-system
+---
+apiVersion: apps/v1
 kind: DaemonSet
 metadata:
  name: kured            # Must match `--ds-name`
  namespace: kube-system # Must match `--ds-namespace`
 spec:
+  selector:
+    matchLabels:
+      name: kured
+  updateStrategy:
+   type: RollingUpdate
  template:
    metadata:
      labels:
        name: kured
    spec:
+      serviceAccountName: kured
+      tolerations:
+        - key: node-role.kubernetes.io/master
+          effect: NoSchedule
+      hostPID: true # Facilitate entering the host mount namespace via init
+      restartPolicy: Always
      containers:
        - name: kured
-          image: quay.io/weaveworks/kured
+          image: docker.io/weaveworks/kured
+                 # If you find yourself here wondering why there is no
+                 # :latest tag on Docker Hub,see the FAQ in the README
          imagePullPolicy: IfNotPresent
-          command:
-            - /usr/bin/kured
-#          args:
-#            - --alert-filter-regexp=^RebootRequired$
-#            - --ds-name=kured
-#            - --ds-namespace=kube-system
-#            - --lock-annotation=weave.works/kured-node-lock
-#            - --period=1h
-#            - --prometheus-url=http://prometheus.monitoring.svc.cluster.local
-#            - --reboot-sentinel=/var/run/reboot-required
-#            - --slack-hook-url=https://hooks.slack.com/...
-#            - --slack-username=prod
-#
-# NO USER SERVICEABLE PARTS BEYOND THIS POINT
+          securityContext:
+            privileged: true # Give permission to nsenter /proc/1/ns/mnt
          env:
            # Pass in the name of the node on which this pod is scheduled
            # for use with drain/uncordon operations and lock acquisition
@@ -34,14 +42,22 @@ spec:
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
-          volumeMounts:
-            # Needed for two purposes:
-            # * Testing for the existence of /var/run/reboot-required
-            # * Accessing /var/run/dbus/system_bus_socket to effect reboot
-            - name: hostrun
-              mountPath: /var/run
-      restartPolicy: Always
-      volumes:
-        - name: hostrun
-          hostPath:
-            path: /var/run
+          command:
+            - /usr/bin/kured
+#            - --alert-filter-regexp=^RebootRequired$
+#            - --blocking-pod-selector=runtime=long,cost=expensive
+#            - --blocking-pod-selector=name=temperamental
+#            - --blocking-pod-selector=...
+#            - --ds-name=kured
+#            - --ds-namespace=kube-system
+#            - --end-time=23:59:59
+#            - --lock-annotation=weave.works/kured-node-lock
+#            - --period=1h
+#            - --prometheus-url=http://prometheus.monitoring.svc.cluster.local
+#            - --reboot-days=sun,mon,tue,wed,thu,fri,sat
+#            - --reboot-sentinel=/var/run/reboot-required
+#            - --slack-hook-url=https://hooks.slack.com/...
+#            - --slack-username=prod
+#            - --slack-channel=alerting
+#            - --start-time=0:00
+#            - --time-zone=UTC
--- a/kured-rbac.yaml
+++ b/kured-rbac.yaml
@@ -0,0 +1,63 @@
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: kured
+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/v1.18.8/staging/src/k8s.io/kubectl/pkg/cmd/drain/drain.go
+#
+- apiGroups: [""]
+  resources: ["nodes"]
+  verbs:     ["get", "patch"]
+- apiGroups: [""]
+  resources: ["pods"]
+  verbs:     ["list","delete","get"]
+- apiGroups: ["apps"]
+  resources: ["daemonsets"]
+  verbs:     ["get"]
+- apiGroups: [""]
+  resources: ["pods/eviction"]
+  verbs:     ["create"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: kured
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: kured
+subjects:
+- kind: ServiceAccount
+  name: kured
+  namespace: kube-system
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  namespace: kube-system
+  name: kured
+rules:
+# Allow kured to lock/unlock itself
+- apiGroups:     ["apps"]
+  resources:     ["daemonsets"]
+  resourceNames: ["kured"]
+  verbs:         ["update"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  namespace: kube-system
+  name: kured
+subjects:
+- kind: ServiceAccount
+  namespace: kube-system
+  name: kured
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: kured
--- a/pkg/alerts/prometheus.go
+++ b/pkg/alerts/prometheus.go
@@ -7,19 +7,20 @@ import (
 	"sort"
 	"time"

-	"github.com/prometheus/client_golang/api/prometheus"
+	"github.com/prometheus/client_golang/api"
+	"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
 // by the supplied regexp.
 func PrometheusActiveAlerts(prometheusURL string, filter *regexp.Regexp) ([]string, error) {
-	client, err := prometheus.New(prometheus.Config{Address: prometheusURL})
+	client, err := api.NewClient(api.Config{Address: prometheusURL})
 	if err != nil {
 		return nil, err
 	}

-	queryAPI := prometheus.NewQueryAPI(client)
+	queryAPI := v1.NewAPI(client)

 	value, err := queryAPI.Query(context.Background(), "ALERTS", time.Now())
 	if err != nil {
--- a/pkg/daemonsetlock/daemonsetlock.go
+++ b/pkg/daemonsetlock/daemonsetlock.go
@@ -1,6 +1,7 @@
 package daemonsetlock

 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"time"
@@ -19,17 +20,19 @@ 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"`
 }

 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) {
+func (dsl *DaemonSetLock) Acquire(metadata interface{}, TTL time.Duration) (acquired bool, owner string, err error) {
 	for {
-		ds, err := dsl.client.ExtensionsV1beta1().DaemonSets(dsl.namespace).Get(dsl.name, metav1.GetOptions{})
+		ds, err := dsl.client.AppsV1().DaemonSets(dsl.namespace).Get(context.TODO(), dsl.name, metav1.GetOptions{})
 		if err != nil {
 			return false, "", err
 		}
@@ -40,20 +43,25 @@ func (dsl *DaemonSetLock) Acquire(metadata interface{}) (acquired bool, owner st
 			if err := json.Unmarshal([]byte(valueString), &value); err != nil {
 				return false, "", err
 			}
+
+			if ttlExpired(value.Created, value.TTL) {
+				return true, value.NodeID, nil
+			}
+
 			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
 		}
 		ds.ObjectMeta.Annotations[dsl.annotation] = string(valueBytes)

-		_, err = dsl.client.ExtensionsV1beta1().DaemonSets(dsl.namespace).Update(ds)
+		_, err = dsl.client.AppsV1().DaemonSets(dsl.namespace).Update(context.TODO(), ds, metav1.UpdateOptions{})
 		if err != nil {
 			if se, ok := err.(*errors.StatusError); ok && se.ErrStatus.Reason == metav1.StatusReasonConflict {
 				// Something else updated the resource between us reading and writing - try again soon
@@ -68,7 +76,7 @@ func (dsl *DaemonSetLock) Acquire(metadata interface{}) (acquired bool, owner st
 }

 func (dsl *DaemonSetLock) Test(metadata interface{}) (holding bool, err error) {
-	ds, err := dsl.client.ExtensionsV1beta1().DaemonSets(dsl.namespace).Get(dsl.name, metav1.GetOptions{})
+	ds, err := dsl.client.AppsV1().DaemonSets(dsl.namespace).Get(context.TODO(), dsl.name, metav1.GetOptions{})
 	if err != nil {
 		return false, err
 	}
@@ -79,6 +87,11 @@ func (dsl *DaemonSetLock) Test(metadata interface{}) (holding bool, err error) {
 		if err := json.Unmarshal([]byte(valueString), &value); err != nil {
 			return false, err
 		}
+
+		if ttlExpired(value.Created, value.TTL) {
+			return true, nil
+		}
+
 		return value.NodeID == dsl.nodeID, nil
 	}

@@ -87,7 +100,7 @@ func (dsl *DaemonSetLock) Test(metadata interface{}) (holding bool, err error) {

 func (dsl *DaemonSetLock) Release() error {
 	for {
-		ds, err := dsl.client.ExtensionsV1beta1().DaemonSets(dsl.namespace).Get(dsl.name, metav1.GetOptions{})
+		ds, err := dsl.client.AppsV1().DaemonSets(dsl.namespace).Get(context.TODO(), dsl.name, metav1.GetOptions{})
 		if err != nil {
 			return err
 		}
@@ -98,7 +111,7 @@ func (dsl *DaemonSetLock) Release() error {
 			if err := json.Unmarshal([]byte(valueString), &value); err != nil {
 				return err
 			}
-			if value.NodeID != dsl.nodeID {
+			if value.NodeID != dsl.nodeID && !ttlExpired(value.Created, value.TTL) {
 				return fmt.Errorf("Not lock holder: %v", value.NodeID)
 			}
 		} else {
@@ -107,7 +120,7 @@ func (dsl *DaemonSetLock) Release() error {

 		delete(ds.ObjectMeta.Annotations, dsl.annotation)

-		_, err = dsl.client.ExtensionsV1beta1().DaemonSets(dsl.namespace).Update(ds)
+		_, err = dsl.client.AppsV1().DaemonSets(dsl.namespace).Update(context.TODO(), ds, metav1.UpdateOptions{})
 		if err != nil {
 			if se, ok := err.(*errors.StatusError); ok && se.ErrStatus.Reason == metav1.StatusReasonConflict {
 				// Something else updated the resource between us reading and writing - try again soon
@@ -120,3 +133,10 @@ 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
+}
--- a/pkg/daemonsetlock/daemonsetlock_test.go
+++ b/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)
+		}
+	}
+}
--- a/pkg/notifications/slack/slack.go
+++ b/pkg/notifications/slack/slack.go
@@ -15,12 +15,14 @@ var (
 type body struct {
 	Text     string `json:"text,omitempty"`
 	Username string `json:"username,omitempty"`
+	Channel  string `json:"channel,omitempty"`
 }

-func NotifyReboot(hookURL, username, nodeID string) error {
+func notify(hookURL, username, channel, message string) error {
 	msg := body{
-		Text:     fmt.Sprintf("Rebooting node %s", nodeID),
+		Text:     message,
 		Username: username,
+		Channel:  channel,
 	}

 	var buf bytes.Buffer
@@ -40,3 +42,11 @@ func NotifyReboot(hookURL, username, nodeID string) error {

 	return nil
 }
+
+func NotifyDrain(hookURL, username, channel, nodeID string) error {
+	return notify(hookURL, username, channel, fmt.Sprintf("Draining node %s", nodeID))
+}
+
+func NotifyReboot(hookURL, username, channel, nodeID string) error {
+	return notify(hookURL, username, channel, fmt.Sprintf("Rebooting node %s", nodeID))
+}
--- a/pkg/timewindow/days.go
+++ b/pkg/timewindow/days.go
@@ -0,0 +1,91 @@
+package timewindow
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var EveryDay = []string{"su", "mo", "tu", "we", "th", "fr", "sa"}
+
+// dayStrings maps day strings to time.Weekdays
+var dayStrings = map[string]time.Weekday{
+	"su":        time.Sunday,
+	"sun":       time.Sunday,
+	"sunday":    time.Sunday,
+	"mo":        time.Monday,
+	"mon":       time.Monday,
+	"monday":    time.Monday,
+	"tu":        time.Tuesday,
+	"tue":       time.Tuesday,
+	"tuesday":   time.Tuesday,
+	"we":        time.Wednesday,
+	"wed":       time.Wednesday,
+	"wednesday": time.Wednesday,
+	"th":        time.Thursday,
+	"thu":       time.Thursday,
+	"thursday":  time.Thursday,
+	"fr":        time.Friday,
+	"fri":       time.Friday,
+	"friday":    time.Friday,
+	"sa":        time.Saturday,
+	"sat":       time.Saturday,
+	"saturday":  time.Saturday,
+}
+
+type weekdays uint32
+
+// parseWeekdays creates a set of weekdays from a string slice
+func parseWeekdays(days []string) (weekdays, error) {
+	var result uint32
+	for _, day := range days {
+		if len(day) == 0 {
+			continue
+		}
+
+		weekday, err := parseWeekday(day)
+		if err != nil {
+			return weekdays(0), err
+		}
+
+		result |= 1 << uint32(weekday)
+	}
+
+	return weekdays(result), nil
+}
+
+// Contains returns true if the specified weekday is a member of this set.
+func (w weekdays) Contains(day time.Weekday) bool {
+	return uint32(w)&(1<<uint32(day)) != 0
+}
+
+// String returns a string representation of the set of weekdays.
+func (w weekdays) String() string {
+	var b strings.Builder
+	for i := uint32(0); i < 7; i++ {
+		if uint32(w)&(1<<i) != 0 {
+			b.WriteString(time.Weekday(i).String()[0:3])
+		} else {
+			b.WriteString("---")
+		}
+	}
+
+	return b.String()
+}
+
+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)
+		}
+	}
+
+	if weekday, ok := dayStrings[strings.ToLower(day)]; ok {
+		return weekday, nil
+	} else {
+		return time.Sunday, fmt.Errorf("Invalid weekday: %s", day)
+	}
+}
--- a/pkg/timewindow/days_test.go
+++ b/pkg/timewindow/days_test.go
@@ -0,0 +1,46 @@
+package timewindow
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestParseWeekdays(t *testing.T) {
+	tests := []struct {
+		input  string
+		result string
+	}{
+		{"0,4", "Sun---------Thu------"},
+		{"su,mo,tu", "SunMonTue------------"},
+		{"sunday,tu,thu", "Sun---Tue---Thu------"},
+		{"THURSDAY", "------------Thu------"},
+		{"we,WED,WeDnEsDaY", "---------Wed---------"},
+		{"", "---------------------"},
+		{",,,", "---------------------"},
+	}
+
+	for _, tst := range tests {
+		res, err := parseWeekdays(strings.Split(tst.input, ","))
+		if err != nil {
+			t.Errorf("Received error for input %s: %v", tst.input, err)
+		} else if res.String() != tst.result {
+			t.Errorf("Test %s: Expected %s got %s", tst.input, tst.result, res.String())
+		}
+	}
+}
+
+func TestParseWeekdaysErrors(t *testing.T) {
+	tests := []string{
+		"15",
+		"-8",
+		"8",
+		"mon,tue,wed,fridayyyy",
+	}
+
+	for _, tst := range tests {
+		_, err := parseWeekdays(strings.Split(tst, ","))
+		if err == nil {
+			t.Errorf("Expected to receive error for input %s", tst)
+		}
+	}
+}
--- a/pkg/timewindow/timewindow.go
+++ b/pkg/timewindow/timewindow.go
@@ -0,0 +1,68 @@
+package timewindow
+
+import (
+	"fmt"
+	"time"
+)
+
+// TimeWindow specifies a schedule of days and times.
+type TimeWindow struct {
+	days      weekdays
+	location  *time.Location
+	startTime time.Time
+	endTime   time.Time
+}
+
+// New creates a TimeWindow instance based on string inputs specifying a schedule.
+func New(days []string, startTime, endTime, location string) (*TimeWindow, error) {
+	tw := &TimeWindow{}
+
+	var err error
+	if tw.days, err = parseWeekdays(days); err != nil {
+		return nil, err
+	}
+
+	if tw.location, err = time.LoadLocation(location); err != nil {
+		return nil, err
+	}
+
+	if tw.startTime, err = parseTime(startTime, tw.location); err != nil {
+		return nil, err
+	}
+
+	if tw.endTime, err = parseTime(endTime, tw.location); err != nil {
+		return nil, err
+	}
+
+	return tw, nil
+}
+
+// Contains determines whether the specified time is within this time window.
+func (tw *TimeWindow) Contains(t time.Time) bool {
+	loctime := t.In(tw.location)
+	if !tw.days.Contains(loctime.Weekday()) {
+		return false
+	}
+
+	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)
+
+	return (loctime.After(start) || loctime.Equal(start)) && (loctime.Before(end) || loctime.Equal(end))
+}
+
+// String returns a string representation of this time window.
+func (tw *TimeWindow) String() string {
+	return fmt.Sprintf("%s between %02d:%02d and %02d:%02d %s", tw.days.String(), tw.startTime.Hour(), tw.startTime.Minute(), tw.endTime.Hour(), tw.endTime.Minute(), tw.location.String())
+}
+
+// parseTime tries to parse a time with several formats.
+func parseTime(s string, loc *time.Location) (time.Time, error) {
+	fmts := []string{"15:04", "15:04:05", "03:04pm", "15", "03pm", "3pm"}
+	for _, f := range fmts {
+		if t, err := time.ParseInLocation(f, s, loc); err == nil {
+			return t, nil
+		}
+	}
+
+	return time.Now(), fmt.Errorf("Invalid time format: %s", s)
+}
--- a/pkg/timewindow/timewindow_test.go
+++ b/pkg/timewindow/timewindow_test.go
@@ -0,0 +1,60 @@
+package timewindow
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestTimeWindows(t *testing.T) {
+	type testcase struct {
+		time   string
+		result bool
+	}
+
+	tests := []struct {
+		days  string
+		start string
+		end   string
+		loc   string
+		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 12:00 PDT", true},
+			{"2019/04/04 11:59 UTC", false},
+		}},
+		{"mon,we,fri", "10:01", "11:30am", "America/Los_Angeles", []testcase{
+			{"2019/04/05 10:30 PDT", true},
+			{"2019/04/06 10:30 PDT", false},
+			{"2019/04/07 10:30 PDT", false},
+			{"2019/04/08 10:30 PDT", true},
+			{"2019/04/09 10:30 PDT", false},
+			{"2019/04/10 10:30 PDT", true},
+			{"2019/04/11 10:30 PDT", false},
+		}},
+		{"mo,tu,we,th,fr", "00:00", "23:59:59", "UTC", []testcase{
+			{"2019/04/18 00:00 UTC", true},
+			{"2019/04/18 23:59 UTC", true},
+		}},
+	}
+
+	for i, tst := range tests {
+		tw, err := New(strings.Split(tst.days, ","), tst.start, tst.end, tst.loc)
+		if err != nil {
+			t.Errorf("Test [%d] failed to create TimeWindow: %v", i, err)
+		}
+
+		for _, cas := range tst.cases {
+			tm, err := time.ParseInLocation("2006/01/02 15:04 MST", cas.time, tw.location)
+			if err != nil {
+				t.Errorf("Failed to parse time \"%s\": %v", cas.time, err)
+			} else if cas.result != tw.Contains(tm) {
+				t.Errorf("(%s) contains (%s) didn't match expected result of %v", tw.String(), cas.time, cas.result)
+			}
+		}
+	}
+}