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05-Deployments.md

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Deployment

Its a Controller like others ReplicationController or ReplicaSet but also helps to update and rollback with zero down time

Features

  1. Multiple Replicas(default=1)
  2. Upgrade
  3. Rollback
  4. Scale up and down
  5. Pause and Resume

create a Deployment manifest file nginx-deploy.yml

here the manifest file will be same as ReplicaSet, only difference will be: kind: Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deploy
  labels:
    app: nginx-app
spec:
  replicas: 3
  selector:
    matchLables:
      app: nginx-app
  template:  
  metadata:
    name: nginx-pod
    labels:
      app: nginx-app
    spec:
      containers:
        - name: nginx
          image: nginx
          imagePullPolicy: ifNotPresent
  • kubectl create -f nginx-deploy.yml

To display the deployments

  • kubectl get deploy

To filter the deployments using lables

  • kubectl get deploy -l app=nginx-app

NOTE: when we create a deployment it will automatically create ReplicaSet

To print complete details of the Deployment

  • kubectl describe deploy nginx-deploy

To update the deployment from nginx 1.7.9 to 1.9.1

two possible ways using kubectl set or kubectl edit

  • kubectl set image deploy nginx-deploy ngnix=nginx:1.9.1 or
  • kubectl edit deploy nginx-deploy

here the deployment file will open in vi editor so we can change the version and replica count

To check the status of deployment

  • kubectl rollout status deployment/nginx-deployment

Suppose we have made some error while deploying instead of 1.9.1 we gave it as 1.91 in such case we have to rollback to previous stable deployment Version

  • kubectl set image deploy ngix-deploy ngix-container=nginx:1.91 --record To show the history related to this deployment
  • kubectl rollout history deployment/nginx-deploy Now we have to undo this rollout
  • kubectl rollout undo deployment/nginx-deploy now check the rollout status -kubectl rollout status deployment/nginx-deploy

To scale up the replica count

  • kubectl scale deployment nginx-deploy --replicas=5

To scale down the replica count

  • kubectl scale deployment nginx-deploy --replicas=1

to delete the deployment -kubectl delete -f nginx-deploy.yml

this will delete all the deployment,ReplicaSet, pods created as part of the manifest file.