proxy - Redirect SSH Users for Docker: Gitlab and Docker: Bitbucket

As you already read in the title I am currently running multiple docker containers which are used as git servers and normally should run under port 22. This is obviously not working, but my requests would be the following.

Have the following available on port 22:

git@HOST - redirected to gitlab docker container

bitbucket@HOST - redirected to bitbucket container

root@HOST - ( I am not working as root at all, but for understanding reasons ) normal SSH Access to the Docker Mainhost.

I know that I would have to sync ssh keys across containers and accounts, but this would not be a big issue, but I have no Idea if it would be possible to build an redirect system.

One approach of mine would be to use ForceCommand but I would not be able to Redirect the SSH Key used...

Another idea would be to have a small tool on port 22 running which just routes the complete requests between all SSH daemons, but I have not (yet?) found such a tool and do not know if it would be possible to build such a tool for security reasons.

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