Docker: Creating a Docker Registry in own hardware

docker

DockerHub is a free SaaS platform that can be used for storing and retrieving Docker images in public repositories. DockerHub also provides private registries, which is a paid service. However if we have a good hardware with enough storage and memory, we can also create our own Docker Registry server.

Docker Registry server can be created using the below steps:

It is assumed that you know basics of Docker.

  • In a lab environment, it is good to choose a server hardware with min 2GB RAM and 50GB storage.
    Install CentOS 7 and deploy Docker service
  • The Docker Registry server can be deployed as a container, by using the image present in DockerHub public cloud registry
  • As the data/images stored in the container are not persistent, it is advisable to mount a local storage folder to the container.
  • Create a folder in the base host which can be attached to the Container that we are going to deploy.
    [root@k8s-master ~]# mkdir /registry/storage
  • Now run the following command to deploy the registry server container attaching the local folder to the container and exposing the listening port, 5000 to the public to access.
  • [root@k8s-master ~]# docker run -d -p 5000:5000 -v /registry/storage:/var/lib/registry --restart=always --name MyRegistry registry:2

Creating and uploading an image to the newly created Docker Registry:

  • Download a Docker image (Example CentOS) from the public repository of DockerHub and run it on the server where our Registry is deployed.
  • Access the CentOS container, and add some data in the container.
  • Commit the running container with the changes. Tag the committed container as “localhost:5000/myfound”
  • Run the following command to upload the image present in the base server to the newly created Registry server
  • [root@k8s-master ~]# docker push localhost:5000/myfund

Download an image from the newly created Docker Registry to a new server and deploy the image as a container:

WIP ….