Playing with explicit docker daemon and registry

private-docker-play.md

Running local fresh docker in a terminal:

mkdir -p /home/core/docker1
sudo docker -d -g /home/core/docker1 -p /var/run/docker1.pid -H tcp://127.0.0.1:5011

Pulling ubuntu image from public registry into that docker (in another terminal):

$ docker -H tcp://localhost:5011 pull ubuntu:13.04
Pulling repository ubuntu
eb601b8965b8: Download complete 
511136ea3c5a: Download complete 
f323cf34fd77: Download complete 
$ docker -H tcp://localhost:5011 images           
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
ubuntu              13.04               eb601b8965b8        6 days ago          166.5 MB

Run a private registry (within a docker container, hey, why not?)

git clone https://github.com/drnic/docker-registry-dockerfile.git
cd docker-registry-dockerfile
git submodule update --init
docker -H tcp://localhost:5011 build -t registry .
docker -H tcp://localhost:5011 run -p 5000:5000 -v $(pwd)/cache:/registry registry

Note, the stored files of this private registry is on the host machine and so will survive restarts of the docker-registry docker container.

Tag and push the downloaded image to the private registry:

$ docker -H tcp://localhost:5011 tag ubuntu:13.04 localhost:5000/ubuntu-13.04

$ docker -H tcp://localhost:5011 push localhost:5000/ubuntu-13.04
The push refers to a repository [localhost:5000/ubuntu-13.04] (len: 1)
Sending image list
Pushing repository localhost:5000/ubuntu-13.04 (1 tags)
511136ea3c5a: Image successfully pushed 
f323cf34fd77: Image successfully pushed 
eb601b8965b8: Image successfully pushed 
Pushing tags for rev [eb601b8965b8] on {http://localhost:5000/v1/repositories/ubuntu-13.04/tags/latest}

Running local fresh docker in another terminal:

mkdir -p /home/core/docker2
sudo docker -d -g /home/core/docker2 -p /var/run/docker2.pid -H tcp://127.0.0.1:5012

Now, you can run a new container in the new docker daemon based on the private registry image:

$ docker -H tcp://localhost:5012 run localhost:5000/ubuntu-13.04 echo hello world
Unable to find image 'localhost:5000/ubuntu-13.04' (tag: latest) locally
Pulling repository localhost:5000/ubuntu-13.04
f323cf34fd77: Download complete 
511136ea3c5a: Download complete 
eb601b8965b8: Download complete 
hello world

Now the fresh docker daemon has the private localhost:5000/ubuntu-13.04 repository downloaded and can be reused again quickly:

$ docker -H tcp://localhost:5012 run localhost:5000/ubuntu-13.04 echo hello world
hello world