This document discusses the Docker-slaves plugin for Jenkins, which uses Docker containers to run build jobs instead of running agents directly on Jenkins slaves. The plugin allows containers to be used as lightweight executors without constraints like SSH or a specific user. Containers can be any Docker image and do not require a JVM. The plugin provides containers as a more flexible alternative to Jenkins' native Docker plugin for running jobs inside containers.

1. #DockerHackDay
@ndeloof @yoanndubreuil
Jenkins
Docker slaves plugin

2. About
• A Jenkins plugin relying on Docker to run slaves
(aka « executors)`
• Alternative to Jenkins’ Docker-plugin

3. anatomy of
a Jenkins slave

4. slave node/slave
« classic » Jenkins slave
ssh
stdin stdout
{..}
slave
agent
git clone
npm install
…
workspace

5. Docker-plugin ?

6. Jenkins’ Docker-plugin
ssh
stdin stdout
slave
agent
git clone
npm install
…

7. Container used as a VM
Image constraints

8. DockerHost
jenkinsci/slave
VOLUME
/home/jenkins
—volumes-from
docker
run
exec build
commands
net
mysql (or other
test resources)
—net=container
stdin stdout
arbitrary
docker image
arbitrary
docker image
arbitrary
docker image
Docker-slaves plugin

9. Containers as they’re
supposed to be used
Image has 0 constraint
✓ no SSHD (sic)
✓ no required user
✓ don’t event need a JVM

10. https://github.com/ndeloof/
docker-slaves-plugin