CI with Gitlab & Docker
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This document discusses using GitLab CI with Docker containers. It describes how to set up a GitLab Runner as a Docker container to execute jobs within Docker containers. The GitLab Runner is configured to use the Docker executor to pull custom images, link dependent services, and cache artifacts between jobs. Docker volumes and environment variables can also be configured for the Runner container.
![Executor Config
● Executor type
● Name (only informative)
● URl of GitLab installation
● Registration token
● Env vars
● etc.
[[runners]]
name = "Road Runner"
url = "https://git.acme.org/ci"
token = "{{TOKEN}}"
executor = "docker"
environment = ["ENV=value"]](https://image.slidesharecdn.com/ciwithdocker-160422013718/85/CI-with-Gitlab-Docker-11-320.jpg)
![Executor Config (Runner)
● Default image (overridden in
gitlab-ci.yml)
● Default services (added to the
ones in .gitlab-ci.yml)
● Private registry for image,
services
● Privileged (“dockerception”)
● Volumes, caches (arbitrary stuff
from host - npm cache, etc.)
● Image whitelist, etc.
[[runners]]
executor = "docker"
[runners.docker]
image = "ruby:2.1"
privileged = false
volumes = ["/data"]
services = ["mysql", "redis:2.8"]
allowed_images = ["ruby:*"]
allowed_services = ["postgres:latest"]](https://image.slidesharecdn.com/ciwithdocker-160422013718/85/CI-with-Gitlab-Docker-12-320.jpg)
![#/srv/gitlab-runner/config/config.toml
concurrent = 1
[[runners]]
name = "demo"
url = "http://192.168.33.20/ci"
token = "0cedbafa816f5b80a496f47c4c2e1e"
executor = "docker"
environment = ["npm_config_cache=/cache/npm","MYSQL_ALLOW_EMPTY_PASSWORD=1"]
[runners.docker]
tls_verify = false
image = "debian:jessie"
privileged = false
disable_cache = false
volumes = ["/var/cache:/cache:rw","/home/vagrant/.ssh:/root/.ssh:ro"]
services = ["mysql"]](https://image.slidesharecdn.com/ciwithdocker-160422013718/85/CI-with-Gitlab-Docker-15-320.jpg)
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CI with Gitlab & Docker
- 1. CI with Docker Using Gitlab CI
- 3. What is GitLab? ● Git based code hosting & collaboration platform ● Similar to GitHub, Bitbucket ● Open source, freemium ● Hosted (free) or on premise ● Rails, PostGres, etc. ● Actively maintained ● https://about.gitlab.com/
- 4. Gitlab CI ● Integrated with Gitlab ● Similar to Travis, Codeship ● Integrated since 8.0 ● Build scripts hosted in repo ● Distributed runners ● Git hooks #gitlab-ci.yml image: ruby:2.2 services: - postgres:9.3 before_script: - bundle install test: script: - bundle exec rake spec
- 6. Gitlab CI Multi Runner ● https://gitlab.com/gitlab- org/gitlab-ci-multi-runner ● Written in Go, single binary ● Linux, Windows, OSX ● Or as Docker container ● Multiple executors - Shell, Docker, VirtualBox, SSH
- 7. ● Distributed ● Even local Runners Gitlab Server #41 #40 #42 runner server-us.domain.com runner server-sg.domain.com runner joe-macbook
- 8. As Docker Service # Start runner as container in daemon mode docker run -d --name gitlab-runner --restart always -v /srv/gitlab-runner/config:/etc/gitlab-runner # runner config -v /var/run/docker.sock:/var/run/docker.sock # docker sock gitlab/gitlab-runner:latest # Register runner with CI Server docker exec -it gitlab-runner gitlab-runner register Note: User running this needs to be in group `docker`.
- 9. Host System Runner Setup docker.sock /usr/bin/docker gitlab-runner #2539 #2540 #2541 spawns Docker Engine
- 10. Docker Executor ● Custom images, services, cache, artifacts (gitlab-ci.yml) ● Caching, artifacts ● Images, from Docker Hub, private registry ● Services ● Persistent storage (volumes=) #gitlab-ci.yml image: jdoe/node-4 services: - mongo:3.0 - redis:2.8 cache: artifacts: test: script: - npm test
- 11. Executor Config ● Executor type ● Name (only informative) ● URl of GitLab installation ● Registration token ● Env vars ● etc. [[runners]] name = "Road Runner" url = "https://git.acme.org/ci" token = "{{TOKEN}}" executor = "docker" environment = ["ENV=value"]
- 12. Executor Config (Runner) ● Default image (overridden in gitlab-ci.yml) ● Default services (added to the ones in .gitlab-ci.yml) ● Private registry for image, services ● Privileged (“dockerception”) ● Volumes, caches (arbitrary stuff from host - npm cache, etc.) ● Image whitelist, etc. [[runners]] executor = "docker" [runners.docker] image = "ruby:2.1" privileged = false volumes = ["/data"] services = ["mysql", "redis:2.8"] allowed_images = ["ruby:*"] allowed_services = ["postgres:latest"]
- 13. Advanced ● Autoscaling (docker-machine) ● Auto cleanup ● Docker-in-Docker
- 14. Demo
- 15. #/srv/gitlab-runner/config/config.toml concurrent = 1 [[runners]] name = "demo" url = "http://192.168.33.20/ci" token = "0cedbafa816f5b80a496f47c4c2e1e" executor = "docker" environment = ["npm_config_cache=/cache/npm","MYSQL_ALLOW_EMPTY_PASSWORD=1"] [runners.docker] tls_verify = false image = "debian:jessie" privileged = false disable_cache = false volumes = ["/var/cache:/cache:rw","/home/vagrant/.ssh:/root/.ssh:ro"] services = ["mysql"]