Avoid recreation of Kubernetes cluster when upgrading web api

Question

Maybe I am missing something but am I right in thinking that if I want to update a webapi that is hosted in my kubernetes cluster in Azure I have to delete and recreate it?

The instructions I am seeing online seem to show deleting the cluster rather than upgrading the api

Paul

Answer 1

If it's your web API application then it's only deployment image update, you don't need to delete the whole cluster.

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There is an example of updating a nginx deployment with new image:

kubectl set image deployment/nginx-deployment nginx=nginx:1.16.1 --record

This way it will first create a new pods with newer version of image and once successfully deployed it will terminate old pods.

You can check status of the update by running

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

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Additional resources:

• https://kubernetes.io/docs/reference/kubectl/cheatsheet/#updating-resources
• https://kubernetes.io/docs/tutorials/kubernetes-basics/update/update-intro/
• https://www.bluematador.com/blog/kubernetes-deployments-rolling-update-configuration