GitLab runner in docker (using dind) with sample gitlab.ci set up

gitlab-runner-dind-setup.txt

** run these commands inside your machine

docker run -v /srv/gitlab-runner/config:/etc/gitlab-runner --name runner -v /var/run/docker.sock:/var/run/docker.sock -d gitlab/gitlab-runner

docker exec -it runner bash

gitlab-runner register  -n \
  --url "https://gitlab.com/" \
  --registration-token "qSf6YzdsXjMug69WxVTt" \
  --executor "docker" \
  --docker-image alpine:latest \
  --docker-privileged \
  --description "ubuntu-dind-runner" \
  --tag-list "ubuntu-dind-runner" \
  --run-untagged="true" 

gitlab-runner start

exit

** sample gitlab-ci.yml (if you would like to add versions to images - keep 'docker:dind' service and 'docker:stable' with the same versions)

variables:
  DOCKER_HOST: tcp://thedockerhost:2375/
  DOCKER_DRIVER: overlay2
  DOCKER_TLS_CERTDIR: ""

build_image:
  stage: build
  services:
    - name: docker:dind
      alias: thedockerhost
  image:
    name: docker:stable
  script:
    - docker login -u <username> -p $REGISTRY_TOKEN $CI_REGISTRY
    - docker build -t $CI_REGISTRY/$CI_PROJECT_PATH .
    - docker push $CI_REGISTRY/$CI_PROJECT_PATH
    - echo "image was built and pushed."
    - docker logout