Can not connect to gitlab using ssh key

General
1

I have a GitLab server created with docker , her is my docker compose file;

networks:
  web_net:
    name: web_net
    external: true
  app_net:
    name: app_net
    external: true

volumes:
  gitlab_backup:
    name: gitlab_backup
  gitlab_data:
    name: gitlab_data
  gitlab_logs:
    name: gitlab_logs
  gitlab_config:
    name: gitlab_config

services:
  gitlab:
    image: gitlab/gitlab-ce:${GITLAB_IMAGE_TAG}
    container_name: ${GITLAB_CONTAINER_NAME}
    restart: always
    hostname: ${GIT_DOMAIN}
    environment:
      GITLAB_OMNIBUS_CONFIG: |
        external_url 'https://${GIT_DOMAIN}'

        # Change the initial default admin password
        gitlab_rails['initial_root_password'] = "${GITLAB_ROOT_PASSWORD}"

        # Gitlab registry config
        registry_external_url 'https://${RIGISTRY_SUB}.${DOMAIN_ADDRESS}'


        # gitlab backup config
        gitlab_rails['manage_backup_path'] = true
        gitlab_rails['backup_path'] = "/var/opt/gitlab/backups"
        gitlab_rails['backup_archive_permissions'] = 0644
        gitlab_rails['backup_keep_time'] = 604800
        gitlab_rails['env'] = {"SKIP" => "registry"}
       

    volumes:
      - gitlab_backup:/var/opt/gitlab/backups
      - gitlab_data:/var/opt/gitlab
      - gitlab_logs:/var/log/gitlab
      - gitlab_config:/etc/gitlab
    ports:
      - "4848:22"
      - "80:80"
      - "5100:5100"
      - "443:443"
    networks:
      - web_net

my gitlab server version is 17.11.2 ce

here is how I tried to create SSH key:

ssh-keygen -t rsa -b 4096 -C "gitlab"
cat ~/.ssh/id_rsa.pub

Copy the entire output of the id_rsa.pub file.

Add the Key to GitLab:

Go to GitLab and log in.

In the top-right corner, click on your profile picture and select Preferences.

In the left menu, click SSH Keys.

Paste your copied public key into the Key field.

You can give it a descriptive title (like “My Laptop” or “Work PC”).

Click Add key.

after that I try test :

ssh -T git@gitlab.mecan.debianproject.com
git@gitlab.mecan.debianproject.com's password:

it is always ask me password. I tested the key in gitlab.com and it works perfectly, I don’t know maybe I need configure SSH in config file.

anyone have same experience?

2

According to the docker config above, your SSH command line will by default attempt to connect to port 22. Since you have port 4848 redirected to port 22 on the Gitlab container, you need to specify the port, eg:

ssh -p 4848 -T git@gitlab.mecan.debianproject.com

otherwise, port 22 is just connecting to the main host where docker is run, and therefore not connecting to the docker container.

1 Like
3

I already thought about that but not successful

image
image683Ă—165 4.05 KB

I also checked iptables and port 4848 is open

4

Hey, I did not read your post in deep but maybe you can find something useful. I had a problem like your when I was testing a Docker gitlab installation.