Gitlab-runner cannot access remote docker daemon in another VM

Question

I am trying to connect to a docker daemon running on a VM using DOCKER_HOST="ssh://user@IPAddress". I have configured the machine using with correct ssh keys.

From the gitlab-runner VM I can manually login to the remote machine using ssh user@IPAddress. I accessing it under the gitlab-runner user account. gitlab-runner account is in the docker group. It is a non login account. Not added to the sudo group either. When I try to accesss docker daemon from a gitlab CI job with Shell executor.

Job:
  - echo "$(whoami)"
  - eval $(ssh-agent -s)
  - ssh-add ~/.ssh/id_rsa_devops
  - export DOCKER_HOST="ssh://user@IPAddress"
  - docker info

Output

gitlab-runner
Agent pid 7418
/home/gitlab-runner/.ssh/id_rsa_devops: No such file or directory

I checked the key, and it is there on that path. I am not sure what is going wrong can someone tell me please ?

What is the file permission based on the output of stat ~/.ssh/id_rsa_devops ? — Lukman
– Lukman, Commented Jun 6, 2020 at 15:11
@Lukman Access: (0600/-rw-------) Uid: ( 999/gitlab-runner) Gid: ( 998/gitlab-runner) — CodeWeed
– CodeWeed, Commented Jun 7, 2020 at 9:31

CodeWeed · Accepted Answer · 2020-06-07 18:03:14Z

1

I fixed it with the extra line after the ssh-add instruction and it worked.

- ssh-keyscan <IPAddress here> >> ~/.ssh/known_hosts && chmod 644 ~/.ssh/known_hosts

answered Jun 7, 2020 at 18:03

CodeWeed

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CodeFreaker · Accepted Answer · 2020-06-06 04:21:37Z

0

Recently, I have implemented similar scenario (datacenter). There I created a gitlab-runner login account and once you have to log to remote server from it to make authenticity.

answered Jun 6, 2020 at 4:21

CodeFreaker

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1 Comment

CodeWeed Over a year ago

I have already done it. I wrote that I can login from the gitlab-runner machine to the remote machine using the key and account.

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