rolling-out-updates.md

Rolling out Updates

Kubernetes makes it easy to rollout updates to your applications using the builtin rolling update mechanism. In this lab you will learn how to:

• Modify deployments to tigger rolling updates
• Pause and resume an active rolling update
• Rollback a deployment to a previous revision

Tutorial: Rollout a new version of the Auth service

kubectl rollout history deployment auth

Modify the auth deployment image:

vim deployments/auth.yaml

image: "kelseyhightower/auth:2.0.0"

kubectl apply -f deployments/auth.yaml --record

kubectl describe deployments auth

kubectl get replicasets

kubectl rollout history deployment auth

Tutorial: Pause and Resume an Active Rollout

kubectl rollout history deployment hello

Modify the hello deployment image:

vim deployments/hello.yaml

image: "kelseyhightower/hello:2.0.0"

kubectl apply -f deployments/hello.yaml --record

kubectl describe deployments hello

kubectl rollout pause deployment hello

kubectl rollout resume deployment hello

Exercise: Rollback the Hello service

Use the kubectl rollout undo command to rollback to a previous deployment of the Hello service.

Summary

In this lab you learned how to rollout updates to your applications by modifying deployment objects to trigger rolling updates. You also learned how to pause and resume an active rolling update and rollback it back using the kubectl rollout command.