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In the last section we spoke about how we could open up a shell inside of a running container by using

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Docker exact dash I.T. and then passing in shell or just simply SDH as the command that we want to execute.

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We've been talking about all this in the context of the exact command which we can use to execute an

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additional command inside of a container.

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But if we wanted to we could also run Docker run the original Docker run command right here along with

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that I.T. flag and start up a shell immediately when a container first starts up.

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Now of course if we start up a shell right when the container first starts that's going to displace

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or keep any other typical or default command from running but sometimes it is quite useful to get a

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empty container with a shell inside of it and just be able to poke around and not have any other process

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running.

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So let's try that out right now at our command line.

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I'm going to flip back over to my terminal.

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I'm going to run it Docker run.

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I'm going to put on the I.T. so that we can attach to standard in on the process that we're about to

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start up.

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I will run the busy box image and then the appropriate program or the primary command that we're going

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to execute inside the container will be sdh.

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So this means start up a new container out of the busy box image run the SDH program which is a shell

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and attach to standard in of that program.

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So when I run this I'll be presented with a command prompt and just like we saw a moment ago I can run

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the Ellis command I can ping Google dot com and hit control C to stop it.

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I can echo a message whatever I want to do.

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Again this is a command that you might be using somewhat frequently.

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Anytime that you want to poke around a container.

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The downside to using Docker run with I.T. and SDH is that chances are you're not going to be running

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any other process.

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It's a little bit more common that you're going to want to start up your container with a primary process

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of like maybe your web server or whatever it might be and then attached to it a running shell.

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By using the docker exact command wherever it is right here.

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But I just wanted you to be aware of this alternate use of Docker run.

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All right.

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Now one last thing I want to cover in the next section.

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So quick break and I'll see you in just a minute.