How to Build Docker Image with Helm Chart Or VM Image Using Maven and Packer. Part 3 Helm Chart

Part 3. Helm Chart

Helm Chart

Helm Chart acts as a template for Kubernetes deployments, so we can create a template to suit our specific needs. It is perfectly possible to use Helm only to create plain Kubernetes manifests and then install them on the cluster using the standard methods (such as kubectl) and/or Spinnaker with custom Application Configurations pipelines.

The copy/paste madness

That you need — it’s just specify basic information about your service.

Treat it as a contract between Developers and Operations.

serverConfigs:
  command: ["twemcache"]
  args:
    - -u
    - twemcache
    - -m
    - "896"
  resources:
    limits:
      cpu: 500m
      memory: 1024Mi
    requests:
      memory: 1024Mi
      cpu: 500m
  service:
    spec:
      type: ClusterIP
      ports:
      - name: twemcached
        port: 22211
        protocol: TCP
        targetPort: 11211

Maven will automatically merge it with all vital options.

---
fullnameOverride: ""
nameOverride: ""
image:
  repository: "us.gcr.io/.../twemcached"
  tag: "2.0"
  pullPolicy: "IfNotPresent"
appConfigs: {}
serverConfigs:
  raw: []
  replicas: 1
  terminationGracePeriodSeconds: 60
  priorityClassName: null
  securityContext: {}
  hostNetwork: false
  dnsPolicy: null
  ingress:
    enable: false
    annotations: {}
    spec: {}
  podDisruptionBudget:
    enable: false
    spec:
      minAvailable: 1
  horizontalPodAutoscaler:
    enable: false
    apiVersion: "autoscaling/v1"
    spec: {}
  configMap:
    annotations:
  statefulSet:
    enable: false
    serviceName: null
    updateStrategy: "RollingUpdate"
    podManagementPolicy: "OrderedReady"
    volumeClaimTemplates:
      enable: true
      metadata:
        annotations: null
    storageClassName: "standard"
    resources:
      requests:
        storage: "10Gi"
  cronJob:
    enable: false
    cronJobs: []
  deployment:
    enable: true
    annotations:
    strategy:
      type: "RollingUpdate"
      rollingUpdate:
        maxSurge: "100%"
        maxUnavailable: "25%"
    spec:
      template:
        annotations:
          prometheus.io/scrape: "false"
          prometheus.io/port: "8081"
  env: []
  command:
  - "twemcache"
  args:
  - "-u"
  - "twemcache"
  - "-m"
  - "896"
  ports: []
  lifecycle: {}
  affinity: {}
  tolerations: []
  topologySpreadConstraints: []
  resources:
    limits:
      cpu: "500m"
      memory: "1024Mi"
    requests:
      memory: "1024Mi"
      cpu: "500m"
  livenessProbe: null
  readinessProbe: null
  startupProbe: null
  serviceAccount:
    create: false
  service:
    enable: true
    metadata:
      annotations: {}
    spec:
      type: "ClusterIP"
      ports:
      - name: "twemcached"
        port: 22211
        protocol: "TCP"
        targetPort: 11211
  volumeMounts:
  - mountPath: "/appconfigs"
    name: "appconfigs"
  volumes: []
  containers:
    fluentbit:
      enable: false
      image:
        repository: "fluent/fluent-bit"
        tag: 1.4
      volumeMounts: []
      env: []
      livenessProbe: null
      readinessProbe: null
      lifecycle: {}
      resources:
        limits:
          cpu: "1000m"
          memory: "128Mi"
        requests:
          memory: "128Mi"
          cpu: "200m"
      ports:
      - name: "data"
        containerPort: 24224
      - name: "http"
        containerPort: 2020