Kubernetes extension: Support env vars from secrets with a prefix

[wpernath]

Description

Right now you can apply a Secret (or ConfigMap) as environment variables like this:

quarkus.kubernetes.env.secrets=my-secret

This would map all keys of the Secret (or ConfigMap) to the environment of the Kubernetes deployment manifest:

envFrom:
  - secretRef:
       name: my-secret

However, especially when you're dealing with more than - perhaps - one datasource, it would be great to specify also a prefix. Kubernetes supports adding a prefix to imported keys from Secret / ConfigMap.

envFrom:
  - secretRef:
    name: my-secret
  prefix: DB1_

If my-secret contains a key called user it would be mapped to DB1_user, which you then could use to specify your datasource properties in application.properties:

%prod.quarkus.datasource.username=${DB1_user:wanja}

It would be great if Quarkus could allow the specification of a prefix inapplication.properties for example by using this grammar:

quarkus.kubernetes.env.secrets=my-secret[DB1_],my-other-secret[DB2_]

Or by introducing another sub key of env called prefix:

quarkus.kubernetes.env.prefix.my-secret=DB1_

Implementation ideas

No response

[quarkus-bot]

/cc @geoand (kubernetes), @iocanel (kubernetes)

[geoand]

Seems reasonable to me! WDYT @iocanel?

[mcruzdev]

Hi @wpernath, can I get this one or do you want to work on this issue?

[wpernath]

@mcruzdev, please, please take it. -- Thank you!

[mcruzdev]

Thank you @wpernath!

[mcruzdev]

Hi @iocanel and @geoand , I am making some research before implement the solution. Looking the io.dekorate.kubernetes.config.EnvBuilder, there is no way to configure a prefix for envFrom property. I can be doing some mistakes, but if not there is a solution for this one?

[iocanel]

@mcruzdev: It's possible that this needs to be implemented in dekorate first. Would you like to give it a try?

[mcruzdev]

Hi @iocanel surely, I will try!

[mcruzdev]

Hi @iocanel, I created the issue on https://github.com/dekorateio/dekorate repo, I will start to work on this tomorrow, thank you!

[mcruzdev]

Hi @iocanel, @wpernath and @geoand I think that the #39782 is done, can you take a look?