When launching a build for a matrix project the job stays infinitely waiting on slaves and the docker plugin does not spin up any containers. I have published scripts which automatically generate a matrix build job if you wish to test this.

https://github.com/samrocketman/jenkins-bootstrap-jervis

1. export a GitHub API token.
2. Provision a jenkins instance with ./jervis_bootstrap.sh
3. When Jenkins is up press the build botton on "Generate Jenkins job from YAML" and generate the project "samrocketman/jervis"
4. Visit "GitHub Organizations" tab and see the jervis-master job for a working builder.
5. Configure the docker plugin and update the samrocketman/jervis-master Jenkins job to use a docker slave.

You'll notice that it just stays infinitely in the queue because jobs never appear.