Docker #4 : Build Docker from sources

Prepare environnement

First, we must install Docker and git on our system, link binary named docker.io to /usr/local/bin/docker. Finally, to avoid uses root or sudo to each Docker relative commands add your user to docker group.

sudo aptitude install docker.io git
sudo ln -s /usr/bin/docker.io /usr/local/bin/docker
sudo usermod -G docker -a tletou

We must logout and login to applied new group membership.

Start building (as normal user)

These commands clone docker's sources, downloads some base images for building.

git clone https://github.com/dotcloud/docker.git
cd docker
make build

These commands build Docker binary.

make binary

We must see this victory message :

[...]
---> Making bundle: binary (in bundles/0.12.0-dev/binary)
Created binary: /go/src/github.com/dotcloud/docker/bundles/0.12.0-dev/binary/docker-0.12.0-dev

Our new docker command should be in bundles/0.12.0-dev/binary

tletou@aquarius:~/LPO/virt/docker/docker$ ls -l bundles/0.12.0-dev/binary/
total 17180
lrwxrwxrwx 1 root root       17 juin   8 15:17 docker -> docker-0.12.0-dev
-rwxr-xr-x 1 root root 17582674 juin   8 15:17 docker-0.12.0-dev
-rw-r--r-- 1 root root       52 juin   8 15:17 docker-0.12.0-dev.md5
-rw-r--r-- 1 root root       84 juin   8 15:17 docker-0.12.0-dev.sha256

Use it

We will remove our link to package provided binary from /usr/local/bin and linking to our new binary.

sudo rm /usr/local/bin/docker
sudo ln -s $PWD/bundles/0.12.0-dev/binary/docker-0.12.0-dev /usr/local/bin/docker
# For compatibility with previous scripts and posts
sudo ln -s $PWD/bundles/0.12.0-dev/binary/docker-0.12.0-dev /usr/local/bin/docker.io

Stop docker service and edit /etc/default/docker.io to point our new binary

sudo service docker.io stop
sudo vim /etc/default/docker.io

Uncomment line:

DOCKER="/usr/local/bin/docker"

Start service

sudo service docker.io start
docker -v
Docker version 0.12.0-dev, build 0c611d9

That's all falks.