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Kubernetes

Scratch notes

  1. kubectl run mysql --image=mysql:5.5 --env MYSQL_ROOT_PASSWORD=root
  2. kubectl expose deployment mysql --port 3306
  3. kubectl run wordpress --image=wordpress --env WORDPRESS_DB_HOST=mysql --env WORDPRESS_DB_PASSWORD=root
  4. kubectl expose deployment wordpress --port 80 --type LoadBalancer

Used with minikube.

Create skeleton manifests

Pod

kubectl run foo --image=ghost --restart=Never --dry-run -o yaml

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: foo
  name: foo
spec:
  containers:
  - image: ghost
    name: foo
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Never
status: {}

Deployment

kubectl run foo --image=ghost --dry-run -o yaml

kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    run: foo
  name: foo
spec:
  replicas: 1
  selector:
    matchLabels:
      run: foo
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        run: foo
    spec:
      containers:
      - image: ghost
        name: foo
        resources: {}
status: {}

Service

This seems to assume that you've already created the 'frontend' service

kubectl expose deployment frontend --port 80 --dry-run -o yaml

apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: guestbook
    tier: frontend
  name: frontend
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: guestbook
    tier: frontend
status:
  loadBalancer: {}

References