--image-pull-policy not working in kubernetes

Question

I have pushed a custom image on dockerhub lets say for this example the image is test:latest. My kubernetes deployment is using this image and I was expecting a new deployment of the pods when I push the new version of the image.

I've created my deployment like this:

kubectl run sample-app --image=`test:latest` --namespace=sample-app --image-pull-policy Always

But this is not happening. What am I doing wrong here?

Answer 1

Kubernetes does not automatically update the pods with the new image when a new version of it is pushed onto dockerhub. The image pull poliyc just tells kubernetes how to acquire the image required for container to run. This means whenever a pod is being created the latest or new version of image will be pulled from dockerhub. If you want to see this update whenever you update the image, just delete the pods associated with the deployment(not the deployment itself).

One other thing you can do is tag the images with version and whenever a new version is uploaded use rolling-update to update all the containers.