Jenkins with DooD (Docker outside of Docker)

A Jenkins container capable of using Docker, so you can Docker while you Docker.

• How to use it
• Advantages
• Disadvantages
• Copyright and Licensing

First of all, WTF is DooD supposed to mean?

Long story short, DooD (as in dude) is the opposite of DinD and whereas the latter includes a whole Docker installation inside of it, the former just uses its underlying host's Docker installation.

This Docker container is highly based on the one explained at the article by Adrian Mouat which explains the DooD approach in order to have a Jenkins container that is able to use Docker. Don't thank me, thank Mouat for his contribution on this matter.

How to use it

If you wish to obtain the image, you just have to ...

docker pull axltxl/jenkins-dood

###However, if you wish to build it instead ...

git clone https://github.com/axltxl/docker-jenkins-dood.git
cd jenkins-dood
docker build -t jenkins-dood .

You can optionally set docker-engine version at build time through the use of the docker_version build argument, like so:

# Default docker_version is 1.11.2
docker build --build-arg docker_version=1.12.0 -t jenkins-dood .

You can easily test it as well with docker-compose

docker-compose up

###Now, time to have fun with it...

docker run -d -v /var/run/docker.sock:/var/run/docker.sock \
              -v /path/to/your/jenkins/home:/var/jenkins_home \
              -p 8080:8080 \
              axltxl/jenkins-dood

###Advantages

• No privileged mode needed
• Simpler, Jenkins will use it underlying host's Docker installation
• Ability to reuse the image cache from the host
• Any settings in the host's Docker daemon will apply to Jenkins container as well
• Easier to set up, you just need to map the host's Docker executable and daemon socket onto the container
• Your host and your container will use the same version of Docker, always.

###Disadvantages

• Although this image does not require privileged mode, it does not make it any safer because it can do docker things directly on the host, so you have to be aware of this
• If you want to manage a complete clean Docker environment inside your Jenkins, this one's not for you, you're looking for DinD

---

What is the most resilient parasite? Bacteria? A virus? An intestinal worm? An idea. Resilient... highly contagious. Once an idea has taken hold of the brain it's almost impossible to eradicate. An idea that is fully formed - fully understood - that sticks; right in there somewhere.

Cobb ("Inception" by Mr. Christopher Nolan), 2010

##Copyright and Licensing Copyright (c) 2015 Alejandro Ricoveri

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.