Run the Docker Registry with High Availability

The Docker Registry is a server-side application that stores and lets you distribute Docker images. The following instructions use Docker Registry version 2.3.0.

Step 1: Create a storage volume for the Docker Registry

To create a storage volume for the Docker Registry, run the following command on each server and make a note of the returned volume ID. You will need the volume ID when you start the Registry container in the next step.

docker volume create -d pxd --name registry_volume --opt \
    size=4 --opt block_size=64 --opt repl=3 --opt fs =ext4

That command creates a volume to attach to your Docker Registry container. The Docker Registry stores its data in the /tmp/registry directory. Use the Docker -v option to attach the Portworx volume to this directory.

If you don't have the Registry image available locally, you can pull it with docker pull registry.

Step 2: Start the Docker Registry

To start the Docker Registry, run the following command. Substitute DOCKER_CREATE_VOLUME_ID for the volume id from the docker volume create command.

docker run -d -p 5000:5000  --name registry \
    -v registry_volume:/var/lib/registry registry:2

Your Docker Registry is now available for Docker push and pull commands on port 5000.