How to tag docker hub automated builds as git sha

Question

We are using automated Docker hub builds to create our application images automatically whenever new commit is pushed to github.

That works well when we manually change the tag on docker hub. Now what we want is to create the image tag automatically as git commit sha so that we can pull that image in our kubernetes deployment for rolling updates

we want some thing like this, when commit foo is pushed in our application repository, docker hub will build the image automatically and we will have new image on dockerhub as myimage:foo

I did not find the documentation to achieve this on docker hub. How can one achieve this ?

Thanks.

Answer 1

Make a new executable file in hooks/ called post_push with these contents to push another image with the latest git short hash as its tag:

#!/bin/bash

SHORTHASH="$(git rev-parse --short HEAD)"
docker tag $IMAGE_NAME $DOCKER_REPO:$SHORTHASH
docker push $DOCKER_REPO:$SHORTHASH