K8s: Templates

affinity_notation.yml

{{ define "affinity_notation" }}
affinity:
  nodeAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
      nodeSelectorTerms:
      - matchExpressions:
          - key: {{ .Values.nodeAffinity.key }}
            operator: In
            values:
            - {{ .Values.nodeAffinity.value }}
{{ end }}

deployment_template.yml

{{ define "ruby_api_deployment" }}
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: {{ .Values.rubyApi.name }}-api
  labels:
    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
  annotations:
    "helm/created": {{ .Release.Time.Seconds | quote }}
spec:
  replicas: {{ .Values.rubyApi.replicas }}
  template:
    metadata:
      labels:
        app: {{ .Values.rubyApi.name }}
        tier: {{ .Values.rubyApi.name }}-api
      annotations:
        date: {{ .Release.Time.Seconds | quote }}
    spec:
      {{ include "affinity_notation" . | indent 6 }}
      containers:
      - name: {{ .Values.rubyApi.name }}
        image: {{ .Values.rubyApi.image.name }}:{{ .Values.rubyApi.image.tag }}
        imagePullPolicy: {{ .Values.rubyApi.image.pullPolicy }}
        command:
        - bundle
        - exec
        - unicorn
        - "-E"
        - {{ .Values.environment }}
        - "-c"
        - /etc/unicorn/unicorn.rb
        - "-l"
        - :3000
        ports:
        - containerPort: 3000
        {{ include "pod_resources" .Values.rubyApi.resources | indent 8 }}
        {{ include "http_get_probe" .Values.rubyApi.livenessProbe | indent 8 }}
        {{ include "http_get_probe" .Values.rubyApi.readinessProbe | indent 8 }}
        volumeMounts:
        - mountPath: /etc/unicorn/unicorn.rb
          subPath: unicorn.rb
          name: {{ .Values.rubyApi.name }}-unicorn-config
          readOnly: true
      volumes:
      - name: {{ .Values.rubyApi.name }}-unicorn-config
        configMap:
          name: {{ .Values.rubyApi.name }}-unicorn-config
{{ end }}

pod_resources.yml

{{ define "pod_resources" }}
resources:
  requests:
    memory: {{ .request.memory }}
    cpu: {{ .request.cpu }}
  limits:
    memory: {{ .limit.memory }}
    cpu: {{ .limit.cpu }}
{{ end }}

probe_template.yml

{{ define "http_get_probe" }}
{{ .type }}:
  httpGet:
    path: {{ .path | default "/health.json" }}
    port: {{ .port | default 3000 }}
  initialDelaySeconds: {{ .initialDelay | default 60 }}
  periodSeconds: {{ .periodSeconds | default 30 }}
  timeoutSeconds: {{ .timeoutSeconds | default 5 }}
{{ end }}

values.yml

environment: integration
nodeAffinity:
  key: cloud.google.com/gke-nodepool
  value: default
rubyApi:
  name: guest
  replicas: 1
  livenessProbe:
    type: livenessProbe
    path: /health.json
    port: 3000
    initialDelay: 60
    periodSeconds: 30
    timeoutSeconds: 5
  readinessProbe:
    type: readinessProbe
    path: /health.json
    port: 3000
    initialDelay: 60
    periodSeconds: 1
    timeoutSeconds: 1
  image:
    name: guest
    tag: latest
    pullPolicy: Always
  resources:
    request:
      memory: 100Mi
      cpu: 50m
    limit:
      memory: 1500Mi
      cpu: 1000m