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deployment.md

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Deployment

  • Deployment creates N number of pods and manages them - such as upgrades, rolling deploys etc.

  • Deployment creates a replica set and replica set in turn creates pods.

Create a deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80

  • Create deployment

  • Show deployments

  • Check deployment specs and status fields

  • Show events of deployment

  • Show how deployment, replicaset and pods are linked with labels

Update deployment image

  • Update using CLI but it can also be done by editing the deployment

  • Notice the record - we want to track the changes to deployment

$ kubectl set image deployment.v1.apps/nginx-deployment nginx=nginx:1.9.1 --record

Check the status of deployment updates:

$ kubectl rollout status deployment.v1.apps/nginx-deployment

Rolling back deployment

Let's first check the status of rollout history

$ kubectl rollout history deployment.v1.apps/nginx-deployment

$ kubectl rollout undo deployment.v1.apps/nginx-deployment
  • Also you can rollback to a specific version by using --to-revision like following: $ kubectl rollout undo deployment.v1.apps/nginx-deployment --to-revision=2

Scale a deployment

Scaling a deployment:

$ kubectl scale deployment.v1.apps/nginx-deployment --replicas=10

If you want autoscaling (Which requires few other things to work)

$ kubectl autoscale deployment.v1.apps/nginx-deployment --min=10 --max=15 --cpu-percent=80

Fail a deployment Upgrade

On purpose let's give a wrong tag in update and look at events

$ kubectl set image deployment.v1.apps/nginx-deployment nginx=nginx:1.912

Rolling updates

Max Unavailable & Max Surge

  • Change max unavailable and surge and then upgrade again with right image tag