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Instead of just running another container

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as we saw it many times before,

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let's use the --help flag on Docker run

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and let's see what we got here.

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And you'll see there are actually a lot of things

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you can configure when you run a container.

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Now good news are, the vast majority of these options

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will never really matter to you,

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or if they do, you will know it, as dumb as that sounds.

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There are a couple of options here

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which we already saw though,

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like the detach flag

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or the publish flag for listening on a port

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but there's one other important flag,

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one other important setting which I wanna mention here.

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And that's the --rm flag.

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This automatically removes the container when it exits.

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And this of course can be very useful

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so that you don't manually have to clean up

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all these stopped containers from time to time.

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Instead you can simply add this to the run command

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to ensure that whenever this container is stopped,

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it's removed automatically.

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And this makes a lot of sense here in my opinion.

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So now we could pick us an image,

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the latest one I have here,

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and then execute docker run on that image

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but we publish the internal port on port 3000.

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Maybe we also run in detach mode

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and I add --rm to ensure that this container

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is always removed whenever we stop it.

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If we now hit Enter,

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this starts the container in detach mode.

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If we type docker ps

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we see the running container therefore.

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And we can visit localhost 3000 and learn Docker in-depth.

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And we can interact with that container as you learned it

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but if you now stop that container,

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you will see that it's also removed.

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So if I stop this container here,

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this again takes a short while,

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but once it is stopped,

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you will notice that if I then run docker ps -a,

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it's not listed

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because of the --rm flag

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which automatically removes a container

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when it's been stopped.

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And it's not uncommon

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that you use this flag for starting your containers,

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especially if your container contains something like,

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like such a node server,

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where you often only stop your container

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if your code changed

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which also means that you need to rebuild your image

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and therefore start a new container anyways.

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So that would be a scenario

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where removing a started container,

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if it's shut down makes a lot of sense

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because this is typically not a container

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which you're ever going to restart.

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We did this for demo purposes in the last lectures

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but as I mentioned there already,

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it's not uncommon that you don't restart

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node server containers like this one.

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So that's another useful piece of information

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you should be aware of.

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Being able to run a container with the --rm flag

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to automatically remove it when it's been stopped.