Why/When to use docker start instead of docker run?

we used docker start –attach <container name> instead of docker run. We use the start command, and rather than naming the image, we specify the name of a container that’s already loaded. The –attach tells Docker to connect to the container output so we can see the results.

We stop containers with docker stop <container name> and remove them with docker rm <container name>. We’ll take a look at that below when we work with applications designed to keep running in the background.

If we check docker ps again, we still see two containers.