Error, lack of understanding? Impossible following the manual to use docker in CI

How to Use GitLab
1

I try install docker in same Gitlab Server EE for CI.

I read guide and step by step, but fail.

Gitlab: 11.4.3-ee (dce6f33)
Debian 9

  1. Install Docker Gitlab Guide

    root@gitlab:~# curl -sSL https://get.docker.com/ | sh
    Executing docker install script, commit: 36b78b2

    Warning: apt-key output should not be parsed (stdout is not a terminal)

    • sh -c echo “deb [arch=amd64] https://download.docker.com/linux/debian stretch edge” > /etc/apt/sources.list.d/docker.list

    • [ debian = debian ]

    • [ stretch = wheezy ]

    • sh -c apt-get update -qq >/dev/null

    • sh -c apt-get install -y -qq --no-install-recommends docker-ce >/dev/null

    • sh -c docker version

    Client:

    Version: 18.06.1-ce

    API version: 1.38

    Go version: go1.10.3

    Git commit: e68fc7a

    Built: Tue Aug 21 17:23:18 2018

    OS/Arch: linux/amd64

    Experimental: false

    Server:

    Engine:

    Version: 18.06.1-ce

    API version: 1.38 (minimum version 1.12)

    Go version: go1.10.3

    Git commit: e68fc7a

    Built: Tue Aug 21 17:22:21 2018

    OS/Arch: linux/amd64

    Experimental: false

    If you would like to use Docker as a non-root user, you should now consider

    adding your user to the “docker” group with something like:

    sudo usermod -aG docker your-user

    Remember that you will have to log out and back in for this to take effect!

    WARNING: Adding a user to the “docker” group will grant the ability to run

          containers which can be used to obtain root privileges on the

      docker host.

      Refer to https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface

      for more information.

  2. Mount config volume into gitlab-runner

    root@gitlab:~# docker run -d --name gitlab-runner --restart always \

    > -v /srv/gitlab-runner/config:/etc/gitlab-runner \

    > -v /var/run/docker.sock:/var/run/docker.sock \

    > gitlab/gitlab-runner:latest

    Unable to find image ‘gitlab/gitlab-runner:latest’ locally

    latest: Pulling from gitlab/gitlab-runner

    18d680d61657: Pull complete

    0addb6fece63: Pull complete

    78e58219b215: Pull complete

    eb6959a66df2: Pull complete

    a468a6515b4f: Pull complete

    40651eb3dddb: Pull complete

    ed4168d5c959: Pull complete

    6119c208b565: Pull complete

    dc48c135c379: Pull complete

    Digest: sha256:51314e4f978572ede9e3140d21af09ab94c8c3cba94d97e35c8efa4119f0b415

    Status: Downloaded newer image for gitlab/gitlab-runner:latest

    ec396bbdb74448cfb790bdf0480ebbc20b05998e209f1e5a6b5a9ce51739c6cd

  3. Register Runner https://docs.gitlab.com/runner/register/index.html#docker

First problem

root@gitlab:~# docker run --rm -t -i -v /srv/gitlab-runner/config:/etc/gitlab-runner --name gitlab-runner gitlab/gitlab-runner register

docker: Error response from daemon: Conflict. The container name "/gitlab-runner" is already in use by container "ec396bbdb74448cfb790bdf0480ebbc20b05998e209f1e5a6b5a9ce51739c6cd". You have to remove (or rename) that container to be able to reuse that name.

See 'docker run --help’.

On stackoverflow get approach.

Test solution

docker rm -f gitlab-runner
root@gitlab:~# docker run --rm -t -i -v /srv/gitlab-runner/config:/etc/gitlab-runner --name gitlab-runner gitlab/gitlab-runner register
docker: Error response from daemon: Conflict. The container name "/gitlab-runner" is already in use by container "ec396bbdb74448cfb790bdf0480ebbc20b05998e209f1e5a6b5a9ce51739c6cd". You have to remove (or rename) that container to be able to reuse that name.

See 'docker run --help'.

root@gitlab:~# docker rm -f gitlab-runner

gitlab-runner

root@gitlab:~# docker run --rm -t -i -v /srv/gitlab-runner/config:/etc/gitlab-runner --name gitlab-runner gitlab/gitlab-runner register

Runtime platform                                    arch=amd64 os=linux pid=8 revision=cf91d5e1 version=11.4.2

Running in system-mode.

Please enter the gitlab-ci coordinator URL (e.g. https://gitlab.com/):

https://gitlab.mydomain.com

Please enter the gitlab-ci token for this runner:

fGXLEzM9GwyrKRbBXuxz

Please enter the gitlab-ci description for this runner:

[d70537116aed]: dockercentral

Please enter the gitlab-ci tags for this runner (comma separated):

dockercentral

ERROR: Registering runner... failed                 runner=fGXLEzM9 status=couldn't execute POST against https://gitlab.mydomain.com/api/v4/runners: Post https://gitlab.mydomain.com/api/v4/runners: dial tcp 195.XXX.XXX.15:443: i/o timeout

PANIC: Failed to register this runner. Perhaps you are having network problems

if try connect to https://gitlab.mydomain.com/api/v4/runners get

[{"id":2,"description":"Runner-Group","ip_address":"195.154.58.15","active":true,"is_shared":false,"name":"gitlab-runner","online":true,"status":"online"}]

What is wrong?