[FLINK-34439] Move chown operations to COPY commands in Dockerfile

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: kubernetes-operator-1.8.0
• Component/s: Kubernetes Operator
• Labels: pull-request-available
• Assignee: Mate Czagany
• Reporter: Mate Czagany
• Created: 13/Feb/24 15:41
• Updated: 14/Feb/24 13:21
• Resolved: 14/Feb/24 13:21

Description

We can lower the size of the output operator container image if we don't run 'chown' commands in seperate RUN commands inside the Dockerfile, but instead use the '--chown' argument of the COPY command.

Using 'RUN chown...' will copy all the files affected with their whole size to a new layer, duplicating the previous files from the COPY command.

Example:

$ docker image history ghcr.io/apache/flink-kubernetes-operator:ccb10b8
...
<missing>     3 months ago  RUN /bin/sh -c chown -R flink:flink $FLINK...  116MB       buildkit.dockerfile.v0
... 

This would mean a 20% reduction in image size.

Issue Links

• links to: GitHub Pull Request #775