// Aula 20 - Deployments

https://kubernetes.io/docs/concepts/workloads/controllers/deployment/

# vim kuard-deployment.yaml

# kuard-deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: kuard
  labels:
    app: kuard
spec:
  replicas: 1
  selector:
    matchLabels:
      run: kuard
  template:
    metadata:
      labels:
        run: kuard
    spec:
      containers:
      - name: kuard
        image: gcr.io/kuar-demo/kuard-amd64:blue
        ports:
        - containerPort: 80

# kubectl create -f kuard-deployment.yaml

# kubectl get deployments kuard -o jsonpath --template {.spec.selector.matchLabels}

# kubectl get replicasets --selector=run=kuard

# kubectl scale deployments kuard --replicas=2

# kubectl get replicasets --selector=run=kuard

# kubectl scale deployments kuard --replicas=1

# kubectl get replicasets --selector=run=kuard

# kubectl describe deployment kuard

spec:
  replicas: 4

# kubectl apply -f kuard-deployment.yaml

image: gcr.io/kuar-demo/kuard-amd64:green
imagePullPolicy: Always

# kubectl apply -f kuard-deployment.yaml

https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations/

    metadata:
      ...
      annotations:
        kubernetes.io/change-cause: "Alterando de green para kuard" 

# kubectl apply -f kuard-deployment.yaml

# kubectl rollout status deployment kuard

# kubectl get replicasets -o wide

# kubectl rollout pause deployments kuard

# kubectl rollout resume deployments kuard

# kubectl rollout history deployments kuard

# kubectl rollout history deployment kuard --revision=4

      annotations:
        kubernetes.io/change-cause: "Alterando de blue para kuard" 
    spec:
      containers:
      - name: kuard
        image: gcr.io/kuar-demo/kuard-amd64:blue

# kubectl apply -f kuard-deployment.yaml

# kubectl rollout history deployments kuard

# kubectl rollout undo deployments kuard

# kubectl get replicasets -o wide

# kubectl rollout history deployments kuard

# kubectl rollout undo deployments kuard --to-revision=6

# kubectl delete deployments kuard

# kubectl delete -f kuard-deployment.yaml