B.2 Create a Registry

Because a swarm consists of multiple Docker Engines, a registry is required to distribute images to all of them.

1. Run the following command to start the registry as a service on your swarm.

   docker service create --name registry --publish published=5000,target=5000 registry:2

2. Run the following command to check the status of the registry.

   docker service ls

   In the response, look for 1/1 under REPLICAS, which indicates that the registry is running. If the response is 0/1, it is probably still pulling the image. Check the status again after some time.

   
   ID             NAME              MODE         REPLICAS   IMAGE            PORTS
   tjc0u55yavu4   registry          replicated   1/1        registry:2       *:5000->5000/tcp

3. Verify that you can use cURL to access the registry.

   curl http://localhost:5000/v2/