distribution/contrib/compose

Docker Compose V1 + V2 registry

This compose configuration configures a v1 and v2 registry behind an nginx proxy. By default, you can access the combined registry at localhost:5000.

The configuration does not support pushing images to v2 and pulling from v1. If a docker client has a version less than 1.6, Nginx will route its requests to the 1.0 registry. Requests from newer clients will route to the 2.0 registry.

Install Docker Compose

1. Open a new terminal on the host with your distribution source.

2. Get the docker-compose binary.

    $ sudo wget https://github.com/docker/compose/releases/download/1.1.0/docker-compose-`uname  -s`-`uname -m` -O /usr/local/bin/docker-compose
   

   This command installs the binary in the /usr/local/bin directory.

3. Add executable permissions to the binary.

    $  sudo chmod +x /usr/local/bin/docker-compose
   

Build and run with Compose

1. In your terminal, navigate to the distribution/contrib/compose directory

   This directory includes a single docker-compose.yml configuration.

    nginx:
    	build: "nginx"
    	ports:
    		- "5000:5000"
    	links:
    		- registryv1:registryv1
    		- registryv2:registryv2
    registryv1:
    	image: registry
    	ports:
    		- "5000"
    registryv2:
    	build: "../../"
    	ports:
    		- "5000"
   

   This configuration builds a new nginx image as specified by the nginx/Dockerfile file. The 1.0 registry comes from Docker's official public image. Finally, the registry 2.0 image is built from the distribution/Dockerfile you've used previously.

2. Get a registry 1.0 image.

    $ docker pull registry:0.9.1 
   

   The Compose configuration looks for this image locally. If you don't do this step, later steps can fail.

3. Build nginx, the registry 2.0 image, and

    $ docker-compose build
    registryv1 uses an image, skipping
    Building registryv2...
    Step 0 : FROM golang:1.4
   
    ...
   
    Removing intermediate container 9f5f5068c3f3
    Step 4 : COPY docker-registry-v2.conf /etc/nginx/docker-registry-v2.conf
     ---> 74acc70fa106
    Removing intermediate container edb84c2b40cb
    Successfully built 74acc70fa106
   

   The commmand outputs its progress until it completes.

4. Start your configuration with compose.

    $ docker-compose up
    Recreating compose_registryv1_1...
    Recreating compose_registryv2_1...
    Recreating compose_nginx_1...
    Attaching to compose_registryv1_1, compose_registryv2_1, compose_nginx_1
    ...
   

5. In another terminal, display the running configuration.

    $ docker ps
    CONTAINER ID        IMAGE                       COMMAND                CREATED             STATUS              PORTS                                     NAMES
    a81ad2557702        compose_nginx:latest        "nginx -g 'daemon of   8 minutes ago       Up 8 minutes        80/tcp, 443/tcp, 0.0.0.0:5000->5000/tcp   compose_nginx_1        
    0618437450dd        compose_registryv2:latest   "registry cmd/regist   8 minutes ago       Up 8 minutes        0.0.0.0:32777->5000/tcp                   compose_registryv2_1   
    aa82b1ed8e61        registry:latest             "docker-registry"      8 minutes ago       Up 8 minutes        0.0.0.0:32776->5000/tcp                   compose_registryv1_1   
   

Explore a bit

1. Check for TLS on your nginx server.

    $ curl -v https://localhost:5000
    * Rebuilt URL to: https://localhost:5000/
    * Hostname was NOT found in DNS cache
    *   Trying 127.0.0.1...
    * Connected to localhost (127.0.0.1) port 5000 (#0)
    * successfully set certificate verify locations:
    *   CAfile: none
    	CApath: /etc/ssl/certs
    * SSLv3, TLS handshake, Client hello (1):
    * SSLv3, TLS handshake, Server hello (2):
    * SSLv3, TLS handshake, CERT (11):
    * SSLv3, TLS alert, Server hello (2):
    * SSL certificate problem: self signed certificate
    * Closing connection 0
    curl: (60) SSL certificate problem: self signed certificate
    More details here: http://curl.haxx.se/docs/sslcerts.html
   

2. Tag the v1 registry image.

     $ docker tag registry:latest localhost:5000/registry_one:latest
   

3. Push it to the localhost.

     $ docker push localhost:5000/registry_one:latest
   

   If you are using the 1.6 Docker client, this pushes the image the v2 registry.

4. Use curl to list the image in the registry.

    	$ curl -v -X GET http://localhost:32777/v2/registry1/tags/list
    	* Hostname was NOT found in DNS cache
    	*   Trying 127.0.0.1...
    	* Connected to localhost (127.0.0.1) port 32777 (#0)
    	> GET /v2/registry1/tags/list HTTP/1.1
    	> User-Agent: curl/7.36.0
    	> Host: localhost:32777
    	> Accept: */*
    	> 
    	< HTTP/1.1 200 OK
    	< Content-Type: application/json; charset=utf-8
    	< Docker-Distribution-Api-Version: registry/2.0
    	< Date: Tue, 14 Apr 2015 22:34:13 GMT
    	< Content-Length: 39
    	< 
    	{"name":"registry1","tags":["latest"]}
    	* Connection #0 to host localhost left intact
   

   This example refers to the specific port assigned to the 2.0 registry. You saw this port earlier, when you used docker ps to show your running containers.