Docker Private Registry

Docker registry image on docker hub uses tcp port 5000 and static directory path to manage images. The YAML configuration file in image defines this configuration.

• Download registry image

    # docker pull registry 

• Create registry container

Dump this container to a tar archive and extract it in /tmp to refer YAML configuration.

    # docker image ls
    REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
    registry            latest              d1fd7d86a825        4 weeks ago         33.3MB

    # docker run -d registry
    c46b242e4167782ac7f0873720495f4e2b2d86d3a033961d8b712b06f4664f62

    # docker ps -a
    CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               
    NAMES
    c46b242e4167        registry            "/entrypoint.sh /e..."   8 seconds ago       Up 5 seconds        5000/tcp            
 
    # docker export c46b242e4167 > /tmp/registry.tar
    # ls -l /tmp/registry.tar
    -rw-r--r-- 1 root root 35716096 Feb 12 13:17 /tmp/registry.tar

    # docker stop c46b242e4167
    # docker rm c46b242e4167

    # cd /tmp; mkdir REGISTRY; cd REGISTRY; tar xvf ../registry.tar 
  

• Default YAML configuration file

  # cat etc/docker/registry/config.yml
  version: 0.1
  log:
      fields:
      service: registry
  storage:
      cache:
      blobdescriptor: inmemory
      filesystem:
          rootdirectory: /var/lib/registry
  http:
      addr: :5000
      headers:
      X-Content-Type-Options: [nosniff]
  health:
      storagedriver:
         enabled: true
         interval: 10s
         threshold: 3

• Customize Image storage directory

  # mkdir /var/Private_Registry
  # docker run -d -p 5000:5000 -v /var/Private_Registry:/var/lib/registry registry 

• Tag and Push Image to the private registry

  # docker image ls
  REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
  registry            latest              d1fd7d86a825        4 weeks ago         33.3MB
  alpine              latest              3fd9065eaf02        4 weeks ago         4.15MB

  # docker tag alpine:latest localhost:5000/alpine:private

  # docker image ls
  REPOSITORY              TAG                 IMAGE ID            CREATED             SIZE
  registry                latest              d1fd7d86a825        4 weeks ago         33.3MB
  alpine                  latest              3fd9065eaf02        4 weeks ago         4.15MB
  localhost:5000/alpine   private             3fd9065eaf02        4 weeks ago         4.15MB

  # ls /var/Private_Registry

  # docker push localhost:5000/alpine:private 
  The push refers to a repository [localhost:5000/alpine]
  cd7100a72410: Pushed
  private: digest: sha256:8c03bb07a531c53ad7d0f6e7041b64d81f99c6e493cb39abba56d956b40eacbc size: 528

  # ls /var/Private_Registry/docker/registry/v2/repositories/
  alpine

• Pull Image from local private registry

  # docker pull localhost:5000/alpine:private
  private: Pulling from alpine
  ff3a5c916c92: Pull complete
  Digest: sha256:8c03bb07a531c53ad7d0f6e7041b64d81f99c6e493cb39abba56d956b40eacbc
  Status: Downloaded newer image for localhost:5000/alpine:private
  root@UBUNTU16:/tmp/REGISTRY# docker image ls
  REPOSITORY              TAG                 IMAGE ID            CREATED             SIZE
  registry                latest              d1fd7d86a825        4 weeks ago         33.3MB
  localhost:5000/alpine   private             3fd9065eaf02        4 weeks ago         4.15MB