GitLab CI/CD SSH Session Hangs in Pipeline

Question

I am using GitLab CI/CD to build and push a docker image to my private GitLab registry.

I am able to successfully SSH into my server from the pipeline runner, but any commands passed into the SSH session doesn't run.

I am trying to pull the latest image from my GitLab container registry, run it, and exit the session to gracefully (successfully) pass the data to my pipeline.

The command I am running is:

ssh -t user@123.456.789 "docker pull registry.gitlab.com/user/project:latest & docker run project:latest"

The above command connects me to my server, and I see the typical welcome message, but the session hangs and no commands are ran.

I have tried using the heredoc format to pass in multiple commands at once, but I can't get a single command to work.

Any advice is appreciated.

& will background the process, && will chain the processes if process 1 exits with a successful return code. — masseyb, Sep 22 '19 at 07:12

VonC · Accepted Answer · 2019-09-21T09:45:52.560

2

For testing, you can try

ssh user@123.456.789 ls

To chain command, avoid using the '&', which would make the first command run in the background, while acting as command separator.

Try:

ssh user@123.456.789 "ls; pwd"

If this work, then try the two docker command, separated by ';'

Try with a docker run -td (that I mentioned here) in order to detach the docker process, without requiring a tty.

edited Sep 21 '19 at 09:45

answered Sep 21 '19 at 08:33

VonC

1,262,500
529
4,410
5,250

When trying `ssh -t user@123.456.789 "ls; pwd` the ssh connection still sits at the motd screen and has no output. – confusedandamused Sep 21 '19 at 08:43
@confusedandamused did you close the "? I see "ls;pwd in your comment, not "ls; pwd" – VonC Sep 21 '19 at 08:44
@ssh try ssh without -t: that would allocate a TTY. – VonC Sep 21 '19 at 08:44
That worked wonderful! Is there a simple way to gracefully end the ssh session - leaving the image running? (So the CI/CD job passes?) – confusedandamused Sep 21 '19 at 09:19
in both cases with or without -t ,having issue of randomly hanging , it does not return the control to next command.... – Niaz Hussain Mar 10 '21 at 14:42
@NiazHussain strange, could you try and ask a separate question, for us to have a look? – VonC Mar 10 '21 at 15:31
@VonC, here it is [question](https://stackoverflow.com/questions/66565543/gitlab-ci-ssh-remote-commands-hangging-randomly-when-copying-files-from-runner-h) – Niaz Hussain Mar 11 '21 at 18:06

GitLab CI/CD SSH Session Hangs in Pipeline

1 Answers1