Step 3: Linking Containers ... Not clear you are meant to stop the old users-service

Hey

This is for your blog entry: http://www.dwmkerr.com/learn-docker-by-building-a-microservice/

In _step 3: Linking Container with the 'link' parameter_, I had both containers running when I tried to run the following `docker run -it -p 8123:8123 --link db:db -e DATABASE_HOST=DB users-service`.

My understanding was it would connect two currently running containers, not a one currently running to a new one. The error message wasn't helpful at all either.

It would had been clearer to me if you specifically state you have to stop the `users-service` container before running this command.

Cheers

Open the linked blog entry and read “Step 3: Linking Container with the 'link' parameter,” then reproduce the documented docker run command if needed. Clarify in that step that the existing users-service container must be stopped before starting the linked container, and explain what the command connects.

Written by the indexing model from the issue text.