Docker and Ansible builder

This is an example of using Docker, Ansible, Vagrant and Jenkins to build a self contained continuous integration environment. It was put together for the a presentation done at Docker London. The slides that go along with this code are here:

http://slides.com/jamiemccrindle/docker-and-ansible#/

Getting started

Requirements

Vagrant SSH

Add the following to your .ssh/config file so that ansible can ssh into Vagrant

Host vagrant
  HostName 127.0.0.1
  User vagrant
  Port 2222
  UserKnownHostsFile /dev/null
  StrictHostKeyChecking no
  IdentityFile ~/.vagrant.d/insecure_private_key

Notes

installing the docker registry will take quite a while. the step will look like this:
```
  docker_registry | docker ports="5000:5000" image="registry"
```
the installation process should be idempotent so if it gets stuck, you should be able to rerun it

Building things

# clone the repo
git clone git@github.com:jamiemccrindle/docker_ansible_build.git
# go into the build directory
cd docker_ansible_build
# start up vagrant
vagrant up
# run ansible with lots of debugging
ansible-playbook build.yml -i inventory/vagrant_build -vvvv

Running it

Browse to http://localhost:8080 and click on the docker_and_ansible_app. Click 'build now' on the left hand side to kick off a build. Once the build has completed, browse to http://localhost:8000 to see the app running.

Todo

Figure out why Jenkins doesn't see changes to the git repo
Run Jenkins in a container

Troubleshooting

It can take a while for jenkins to come up, which will result in a 503 when the app tries to get the cli, just rerun

  failed: [vagrant] => {"dest": "/opt/jenkins/jenkins-cli.jar", "failed": true, "response": "HTTP Error 503: Service Unavailable", "state": "absent", "status_code": 503, "url": "http://localhost:8080/jnlpJars/jenkins-cli.jar"}
  msg: Request failed

What it is doing under the hood

Installs the latest version of Docker
Installs Ansible
Installs Java
Installs a Private Docker Repository
Installs and configures Jenkins
Adds Jenkins Job to build our application
The Jenkins Job:
- Compiles the application
- Builds a docker image
- Pushes the docker image to the docker repository
- Runs and tests the new docker

lu-chi/docker_ansible_build