GitlabRunner - tcp://localhost:2375. Is the docker daemon running?

How to Use GitLab
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1

Hi!

I’m trying to install a gitlab-runner on EC2. The executor that I want is Docker.

My config.toml is

concurrent = 10
check_interval = 0

[session_server]
  session_timeout = 1800

[[runners]]
  name = "My Docker Runner"
  url = "https://gitlab.com/"
  token = "SECRET"
  executor = "docker"
  [runners.custom_build_dir]
  [runners.cache]
    [runners.cache.s3]
    [runners.cache.gcs]
    [runners.cache.azure]
  [runners.docker]
    tls_verify = false
    image = "docker:19.03.12"
    privileged = true
    disable_entrypoint_overwrite = false
    oom_kill_disable = false
    disable_cache = false
    volumes = ["/certs/client", "/cache"]
    shm_size = 0

My .gitlab-ci.yml is

image: docker:19.03.12

variables:
  # When you use the dind service, you must instruct Docker to talk with
  # the daemon started inside of the service. The daemon is available
  # with a network connection instead of the default
  # /var/run/docker.sock socket. Docker 19.03 does this automatically
  # by setting the DOCKER_HOST in
  # https://github.com/docker-library/docker/blob/d45051476babc297257df490d22cbd806f1b11e4/19.03/docker-entrypoint.sh#L23-L29
  #
  # The 'docker' hostname is the alias of the service container as described at
  # https://docs.gitlab.com/ee/ci/docker/using_docker_images.html#accessing-the-services.
  #
  # Specify to Docker where to create the certificates. Docker
  # creates them automatically on boot, and creates
  # `/certs/client` to share between the service and job
  # container, thanks to volume mount from config.toml
  DOCKER_TLS_CERTDIR: "/certs"

services:
  - docker:19.03.12-dind

before_script:
  - docker info

build:
  stage: build
  script:
    - docker build -t my-docker-image .
    - docker run my-docker-image /script/to/run/tests

I always have this error:

Running with gitlab-runner 14.4.0 (4b9e985a)
  on My Docker Runner u9_6MpHg
Resolving secrets
00:00
Preparing the "docker" executor
Using Docker executor with image docker:19.03.12 ...
Starting service docker:19.03.12-dind ...
Authenticating with credentials from $DOCKER_AUTH_CONFIG
Pulling docker image docker:19.03.12-dind ...
Using docker image sha256:66dc2d45749a48592f4348fb3d567bdd65c9dbd5402a413b6d169619e32f6bd2 for docker:19.03.12-dind with digest docker@sha256:674f1f40ff7c8ac14f5d8b6b28d8fb1f182647ff75304d018003f1e21a0d8771 ...
Waiting for services to be up and running...
Authenticating with credentials from $DOCKER_AUTH_CONFIG
Pulling docker image docker:19.03.12 ...
Using docker image sha256:81f5749c9058a7284e6acd8e126f2b882765a17b9ead14422b51cde1a110b85c for docker:19.03.12 with digest docker@sha256:d41efe7ad0df5a709cfd4e627c7e45104f39bbc08b1b40d7fb718c562b3ce135 ...
Preparing environment
00:00
Running on runner-u96mphg-project-31310309-concurrent-0 via ip-10-120-65-72.ec2.internal...
Getting source from Git repository
00:02
Fetching changes with git depth set to 50...
Initialized empty Git repository in /builds/mediagrif/itt/network/poc/test-private-runner/.git/
Created fresh repository.
Checking out 3d7fe999 as main...
Skipping Git submodules setup
Executing "step_script" stage of the job script
00:01
Using docker image sha256:81f5749c9058a7284e6acd8e126f2b882765a17b9ead14422b51cde1a110b85c for docker:19.03.12 with digest docker@sha256:d41efe7ad0df5a709cfd4e627c7e45104f39bbc08b1b40d7fb718c562b3ce135 ...
$ docker info
Client:
 Debug Mode: false
Server:
**ERROR: Cannot connect to the Docker daemon at tcp://localhost:2375. Is the docker daemon running?**
errors pretty printing info
Cleaning up project directory and file based variables
00:00
ERROR: Job failed: exit code 1

I tried all day long and follow all the instructions on the gitlab documentation and nothing works. I’m always getting the same error. I tried with shell executor, docker and docker+machine executor and I have the same error.

I tried to use DinD, direct Socket and Shell executor to build my Docker image.

I tried to specify DOCKER_HOST, service alias, disabling certificate.

What I found strange is that even if I change the DOCKER_HOST in my gitlab-ci, when I look at /etc/hosts, I see the record for the service, but the error message is always pointing on localhost.

I tried to use version 13.11.0 and 14.4.0 of Gitlab Runner. I tried to install the runner it with YUM. I also tried to run it with Docker run. I also tried in my gitlab-ci file to use Docker 19 and Docker 20.

Nothing works.

Does somebody have an hint for me please?

Thanks

Yann