1.
Testing with Jenkins, Docker and Ansible

2.
Move fast, but don’t break things
● Agile development
● Continuous Integration
● But don’t break production
● Testing, testing, testing

3.
Goals
● Test everything after committing to master
● Test on different platforms
● Reduce testing time
● Automate and re-use

4.
But why so many tests?
● Test the deployment of the app in a clean
environment, a fresh build.
● Test the deployment in a staging
environment and ensure backwards
compatibility
● Test the interface against multiple browsers

5.
Jenkins
● Mature and widely used
● Very flexible
● Easily extendable via plugins
● Github integration

6.
Docker
● Fast and lightweight containers
● Docker images can jumpstart the process
● Dockerfiles for automation
● Docker repositories let us reuse images

7.
Ansible
● Deployment automation
● Flexible configuration through playbooks
● Orchestration

8.
The Process
● Jenkins responds to Github commits
● Calls Ansible to spawn our test servers
● Servers use Docker images to optimize test
speed

9.
Dockerfile example
FROM ubuntu:latest
MAINTAINER mist.io
RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
RUN apt-get update
RUN mkdir MIST
RUN cd MIST && git clone https://github.com/mistio/mist.io
WORKDIR MIST/mist.io
RUN git pull
RUN virtualenv . && ./bin/pip install --upgrade setuptools
RUN ./bin/python bootstrap.py && ./bin/buildout -N
ADD ./test_config.py src/mist/io/tests/features/
ADD ./init.sh /
ENTRYPOINT ./init.sh

10.
Dockerfile example
● FROM Chooses the base image (ubuntu/latest)
● RUN Runs the following commands.
● ADD Adds files from our host machine to the docker
image.
● ENTRYPOINT This tells docker to start with ./init.sh
script every time we run the image

11.
Ansible hosts file
Group your servers in an ansible_hosts file:
[testservers]
testserver1 ansible_ssh_host=178.127.33.109
testserver2 ansible_ssh_host=178.253.121.93
testserver3 ansible_ssh_host=114.252.27.128[testservers:vars]
ansible_ssh_user=mister
ansible_ssh_private_key_file=~/.ssh/testkey

12.
Define docker in playbook
- name: Add Docker repository key
sudo: True
apt_key: url="https://get.docker.io/gpg"- name: Add Docker repository
sudo: True
apt_repository:
repo: 'deb http://get.docker.io/ubuntu docker main'
update_cache: yes- name: Install Docker
sudo: True
apt: pkg=lxc-docker state=present
notify: "Start Docker"

13.
Define docker in playbook
- name: Make dir for io docker files
command: mkdir -p docker/iotest- name: Copy io Dockerfiles
template:
src=templates/iotest/Dockerfile.j2 dest=docker/iotest/Dockerfile- name: Copy io init scripts
copy:
src=templates/iotest/init.sh dest=docker/iotest/init.sh- name: Build docker images for io
sudo: True
command: docker build -t mist/iotest docker/iotest

14.
Thank you!
● Jenkins-Github integration: https://wiki.jenkins-
ci.org/display/JENKINS/GitHub+Plugin
● Complete code and examples: http://blog.mist.io/post/82383668190/move-
fast-and-dont-break-things-testing-with
● A more advanced Ansible setup:
https://developer.rackspace.com/blog/move-fast-and-dont-break-things-
testing-with-jenkins-ansible-and-docker/