ExZuul - Experiment Zuul on an easy to start platform

!!! This docker container should only be used as a test platform !!!

This docker container bundles all the needed pre-configured pieces to experiments the Zuul gating system used by the Openstack project. Zuul is a generic software and can be reused for other projects outside of Openstack.

This docker container is based on a centos7 image and contains:

• Gerrit
• Zuul
• Jenkins
• Jenkins-job-builder

Use Fedora 21 Cloud as Docker host

The easiest way to start with Docker is to use a Fedora 21 Cloud image. Start the image and execute the following commands to install Docker and other requirements:

$ sudo yum install https://get.docker.com/rpm/1.7.0/fedora-21/RPMS/x86_64/docker-engine-1.7.0-1.fc21.x86_64.rpm
$ sudo service docker start
$ sudo docker run hello-world
$ sudo yum install git python-pip

Services

Use ci.localdomain to access the services. It means you should add such a line in your laptop /etc/hosts:

<container_ip> ci.localdomain

Gerrit

Gerrit is configured with "DEVELOPMENT_BECOME_ANY_ACCOUNT" setting so no need to deal with any external authentication system. Also a local H2 database is used.

Two users are created by default:

• An admin user
• A Zuul user (to allow the zuul to perform action on Gerrit)

Gerrit can be reached at http://ci.localdomain:8080

Zuul

Zuul is pre-configured to listen to events from the Gerrit event stream and will connect to Gerrit at container startup. Zuul's merger git repositories are served via a pre-configured Apache.

layout.yaml is stored at /etc/zuul/layout.yaml. Two pipeline (check and gate) are already configured.

Zuul status page can be reached at http://ci.localdomain

Jenkins

Only a Jenkins master is configured here. The Jenkins Gearman plugin is pre-configured to connect on the Zuul gearman server.

A default user "jenkins/password" is pre-configured in order to allow to perform administrative tasks on Jenkins. This is needed in order to use Jenkins Jobs Builder to manage jobs on Jenkins.

Jenkins Jobs Builder is pre-configured and can be used locally to update jobs.

Jenkins can be reached at http://ci.localdomain:8081/jenkins

Build and start

Install Docker at least 1.6 and build the container:

$ sudo docker build -t exzuul .

Start the container:

$ sudo docker run -d -h ci.localdomain -v /dev/urandom:/dev/random -p 80:80 -p 29418:29418 -p 8080:8080 -p 8081:8081 exzuul
$ CID=$(sudo docker ps | grep exzuul | cut -f1 -d' ')

Get a live shell inside a running container:

$ sudo docker exec -i -t $CID /bin/bash

Get the container IP:

$ sudo docker inspect --format '{{ .NetworkSettings.IPAddress }}' $CID

You should access the container using ci.localdomain hostname instead of the IP. Please add "<container_ip> ci.localdomain" in /etc/hosts.

WARNING: If the container is stopped and restarted all local work and configuration will be lost.

Configure a first project to be validated via Zuul

Here is the first steps to perform in order to have a project hosted on Gerrit and a job triggered by Zuul.

• Login to Gerrit as the admin user. Add your public key in the admin user settings page. If you don't have a key yet, create one:

$ ssh-keygen
$ cat ~/.ssh/id_rsa.pub

• Create a Job in Jenkins for "testproject" using the following command. The container already has a valid JJB configuration with a working job definition for "testproject".

$ sudo docker exec -i -t $CID /bin/bash
# # Create a job in Jenkins for a project call "testproject"
# jenkins-jobs --conf /etc/jenkins_jobs/jenkins_jobs.ini update /etc/jenkins_jobs/jobs

• The job "testproject-unit-tests" must be shown in the Jenkin job list
• As admin - create a project called "testproject" in Gerrit (check "create inital empty commit")
• Clone the new project on your local computer and submit the as a review

$ git clone http://ci.localdomain:8080/testproject
$ cd testproject
$ git checkout -b "first_commit"
$ cat > .gitreview << EOF
[gerrit]
host=ci.localdomain
port=29418
project=testproject.git
EOF
$ cat > run_tests.sh << EOF
#!/bin/bash
exit 0
EOF
$ chmod +x run_tests.sh
$ sudo pip install git-review
$ touch "$HOME/.ssh/known_hosts"
$ ssh-keygen -f "$HOME/.ssh/known_hosts" -R [ci.localdomain]:29418
$ git review -s # use "admin" as login and be sure to have the public key listed by ssh-add -l
$ git config --add gitreview.username "admin"
$ git add run_tests.sh .gitreview
$ git commit -m "first commit"
$ git review

In the Gerrit web UI you should see your new patch on "testproject" and a green check sign added by Zuul in the "Verified" label.

If you succeed to have your patch validated by Zuul that means the platform is ready to be used !