i am trying to build a supersimple cicd pipeline using gitlab ci. upon running it i get presented with the error :

Server:
ERROR: Cannot connect to the Docker daemon at tcp://docker:2375. Is the docker daemon running?

my .gitlab-ci.yml is :

image: docker:latest
variables:
  DOCKER_HOST: tcp://docker:2375
services:
  - name: docker:dind
    entrypoint: ["env", "-u", "DOCKER_HOST"]
    command: ["dockerd-entrypoint.sh"]


before_script:
  - docker --version
docker_build:
  stage: build
  image: docker:latest
  services:
    - docker:dind
  script:
    - docker build -t arieltar/hubsec:1.1 .
    - docker push arieltar/hubsec:1.1

CodePudding user response：

Based on the error message I would ask, does the gitlab-runner user belong to the docker group?

You will need to decide if you want to use Docker-in-Docker with, or without TLS. This requires changing /etc/gitlab-runner/config.toml settings, and assigning the DOCKER_TLS_CERTDIR in your .gitlab-ci.yml file. See the Docker-in-docker section of the GitLab docs.

CodePudding user response：

Please check below things as prelim.

1. Whether docker is running or not
2. Login with gitlab-user if you are running pipeline with gitlab user and check if that user can access or run docker ps without sudo :).
3. add below entry if pt1. and pt2 satisfied.

services:

• name: docker:dind entrypoint: ["dockerd-entrypoint.sh", "--tls=false"] script:
• export DOCKER_HOST=tcp://127.0.0.1:2375 && docker build -t arieltar/hubsec:1.1 .