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21.MD

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# k apply  -f /var/work/21/app-21.yaml


error: resource mapping not found for name: "app-21" namespace: "" from "/var/work/21/app-21.yaml": no matches for kind "Deployment" in version "extensions/v1beta1"
ensure CRDs are installed first

# k create deployment test --image nginx -o yaml --dry-run=client

apiVersion: apps/v1              # it is current version for deployment
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: test
  name: test
spec:
  replicas: 1
  selector:
    matchLabels:
      app: test
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: test
    spec:
      containers:
      - image: nginx
        name: nginx
        resources: {}
status: {}


# vim  /var/work/21/app-21.yaml

apiVersion: apps/v1          # update it from  extensions/v1beta1
kind: Deployment
metadata:
  name: app-21
  labels:
    app: app-21
spec:
  replicas: 3
  selector:
    matchLabels:
      app: app-21
  template:
    metadata:
      labels:
        app: app-21
    spec:
      containers:
      - name: ping-pong
        image: viktoruj/ping_pong:alpine
        ports:
        - containerPort: 8080


k apply -f /var/work/21/app-21.yaml

k get po,deployment -l app=app-21