chaoskube: add chaoskube helm chart (helm#327)

* feat(chaoskube): add chaoskube helm chart

* feat(chaoskube): make dry run mode the default

* fix(chaoskube): change the wording explaining dryRun

* fix(chaoskube): better explain how to disable dryRun

* fix(chaoskube): remove useless empty line

* chore(chaoskube): move chaoskube to stable

* fix(chaoskube): update docs to reflect move to stable

* docs(chaoskube): explain what helm install does

Author: linki

stable/chaoskube/Chart.yaml

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+name: chaoskube
+version: 0.3.1
+description: A Helm chart for chaoskube
+home: https://github.com/linki/chaoskube
+sources:
+- https://github.com/linki/chaoskube
+maintainers:
+- name: Martin Linkhorst
+  email: linki+helm.sh@posteo.de
+engine: gotpl

stable/chaoskube/README.md

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+# Chaoskube Helm Chart
+
+[chaoskube](https://github.com/linki/chaoskube) periodically kills random pods in your Kubernetes cluster.
+
+## TL;DR;
+
+```console
+$ helm install stable/chaoskube
+```
+
+## Installing the Chart
+
+To install the chart with the release name `my-release`:
+
+```console
+$ helm install --name my-release stable/chaoskube
+```
+
+The command deploys chaoskube on the Kubernetes cluster in the default configuration. The [configuration](#configuration) section lists the parameters that can be configured during installation.
+
+## Uninstalling the Chart
+
+To uninstall/delete the my-release deployment:
+
+```console
+$ helm delete my-release
+```
+
+The command removes all the Kubernetes components associated with the chart and deletes the release.
+
+## Configuration
+
+By default `chaoskube` runs in dry-run mode so it doesn't actually kill anything.
+If you're sure you want to use it run `helm` with:
+
+```console
+$ helm install stable/chaoskube --set dryRun=false
+```
+
+| Parameter                 | Description                                         | Default                           |
+|---------------------------|-----------------------------------------------------|-----------------------------------|
+| `name`                    | container name                                      | chaoskube                         |
+| `image`                   | docker image                                        | quay.io/linki/chaoskube           |
+| `imageTag`                | docker image tag                                    | v0.3.1                            |
+| `replicas`                | number of replicas to run                           | 1                                 |
+| `interval`                | interval between pod terminations                   | 10m                               |
+| `dryRun`                  | don't kill pods, only log what would have been done | true                              |
+| `resources.cpu`           | cpu resource requests and limits                    | 10m                               |
+| `resources.memory`        | memory resource requests and limits                 | 16Mi                              |

stable/chaoskube/templates/NOTES.txt

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+chaoskube is running and will kill arbitrary pods every {{ .Values.interval }}.
+
+You can follow the logs to see what chaoskube does:
+
+    POD=$(kubectl get pods -l app={{ printf "%s-%s" .Release.Name .Values.name }} --namespace {{ .Release.Namespace }} --output name)
+    kubectl logs -f $POD --namespace={{ .Release.Namespace }}
+{{ if .Values.dryRun }}
+You are running in dry-run mode. No pod is actually terminated.
+{{ end -}}

stable/chaoskube/templates/deployment.yaml

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+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: {{ printf "%s-%s" .Release.Name .Values.name }}
+  labels:
+    app: {{ printf "%s-%s" .Release.Name .Values.name }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  replicas: {{ .Values.replicas }}
+  template:
+    metadata:
+      labels:
+        app: {{ printf "%s-%s" .Release.Name .Values.name }}
+        chart: {{ .Chart.Name }}-{{ .Chart.Version }}
+        release: {{ .Release.Name }}
+        heritage: {{ .Release.Service }}
+    spec:
+      containers:
+      - name: {{ .Values.name }}
+        image: {{ .Values.image }}:{{ .Values.imageTag }}
+        args:
+        - --in-cluster
+        - --interval={{ .Values.interval }}
+        {{- if not .Values.dryRun}}
+        - --no-dry-run
+        {{- end }}
+        resources:
+          requests:
+            cpu: {{ .Values.resources.cpu }}
+            memory: {{ .Values.resources.memory }}
+          limits:
+            cpu: {{ .Values.resources.cpu }}
+            memory: {{ .Values.resources.memory }}

stable/chaoskube/values.yaml

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+# container name
+name: chaoskube
+
+# docker image
+image: quay.io/linki/chaoskube
+
+# docker image tag
+imageTag: v0.3.1
+
+# number of replicas to run
+replicas: 1
+
+# interval between pod terminations
+interval: 10m
+
+# don't kill pods, only log what would have been done
+dryRun: true
+
+# resource requests and limits
+resources:
+  cpu: 10m
+  memory: 16Mi