example helm chart

helm/draino/.helmignore

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+# 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
+.vscode/

helm/draino/Chart.yaml

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+apiVersion: v1
+description: draino chart
+name: draino
+version: 0.1.0

helm/draino/templates/_helpers.tpl

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+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "draino.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 "draino.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 "draino.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
+{{- end -}}

helm/draino/templates/clusterrole.yaml

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+{{- if .Values.rbac.create -}}
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRole
+metadata:
+  name: {{ include "draino.fullname" . }}
+  labels:
+    app.kubernetes.io/name: {{ include "draino.name" . }}
+    helm.sh/chart: {{ include "draino.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+rules:
+- apiGroups: ['']
+  resources: [events]
+  verbs: [create, patch, update]
+- apiGroups: ['']
+  resources: [nodes]
+  verbs: [get, watch, list, update]
+- apiGroups: ['']
+  resources: [nodes/status]
+  verbs: [patch]
+- apiGroups: ['']
+  resources: [pods]
+  verbs: [get, watch, list]
+- apiGroups: ['']
+  resources: [pods/eviction]
+  verbs: [create]
+- apiGroups: [extensions]
+  resources: [daemonsets]
+  verbs: [get, watch, list]
+
+{{- end -}}

helm/draino/templates/clusterrolebinding.yaml

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+{{- if .Values.rbac.create -}}
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRoleBinding
+metadata:
+  name: {{ include "draino.fullname" . }}
+  labels:
+    app.kubernetes.io/name: {{ include "draino.name" . }}
+    helm.sh/chart: {{ include "draino.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: {{ template "draino.fullname" . }}
+subjects:
+  - kind: ServiceAccount
+    name: {{ template "draino.fullname" . }}
+    namespace: {{ .Release.Namespace }}
+{{- end -}}

helm/draino/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "draino.fullname" . }}
+  labels:
+    app.kubernetes.io/name: {{ include "draino.name" . }}
+    helm.sh/chart: {{ include "draino.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: {{ include "draino.name" . }}
+      app.kubernetes.io/instance: {{ .Release.Name }}
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: {{ include "draino.name" . }}
+        app.kubernetes.io/instance: {{ .Release.Name }}
+    spec:
+      containers:
+        - name: {{ .Chart.Name }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          command:
+            - /draino
+          {{- if .Values.dryRun }}
+            - --dry-run
+          {{ end }}
+          {{- range $key, $value := .Values.extraArgs }}
+            - --{{ $key }}{{ if $value }}={{ $value }}{{ end }}
+          {{- end }}
+          {{- range .Values.conditions }}
+            - {{ . }}
+          {{- end }}
+          livenessProbe:
+            httpGet:
+              path: /healthz
+              port: 10002
+              initialDelaySeconds: 30
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+      serviceAccountName: {{ if .Values.rbac.create }}{{ template "draino.fullname" . }}{{ else }}"{{ .Values.rbac.serviceAccountName }}"{{ end }}
+      {{- with .Values.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+    {{- with .Values.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+    {{- end }}
+    {{- with .Values.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+    {{- end }}

helm/draino/templates/serviceaccount.yaml

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+{{- if .Values.rbac.create -}}
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: {{ include "draino.fullname" . }}
+  labels:
+    app.kubernetes.io/name: {{ include "draino.name" . }}
+    helm.sh/chart: {{ include "draino.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end -}}

helm/draino/values.yaml

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+dryRun: false
+
+extraArgs: {}
+
+conditions: {}
+
+replicaCount: 1
+
+image:
+  repository: planetlabs/draino
+  tag: 5e07e93
+  pullPolicy: IfNotPresent
+
+resources:
+  limits:
+    cpu: 100m
+    memory: 128Mi
+  requests:
+    cpu: 100m
+    memory: 128Mi
+
+rbac:
+  create: true
+  serviceAccountName:
+
+nodeSelector: {}
+
+tolerations: []
+
+affinity: {}