• build cluster

docker compose up -d

Wait a few minutes for GitLab to fully initialize (you can tail logs using docker logs -f gitlab).

• access GitLab http://localhost:8929

Username: root

Password: rootpassword

or as specified in docker-compose.yaml

optionally change the credentials later through GitLab UI.

• Register GitLab Runner manually:

docker exec -it gitlab-runner gitlab-runner register

You’ll be prompted: | | |

• in the project build file .gitlab-ci.yml reference the runner image

---
build-java:
  image: my/java-runner:latest
  script:
    - java -version
    - mvn clean package