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In this video we're going to do a quick overview of some very basic Docker commands.

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Just make sure these are fresh in your mind.

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We're going to be running all the commands you see here quite a bit and also running some variance of

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them that are based on Cuban eddies as opposed to Docker.

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But don't worry about that part just yet.

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So first command we're going to get a quick reminder on is darker build.

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We did just run this last video but just as a reminder whenever we build a new image we can add on that

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dash t flag that will tag the image that is created.

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If we add on the dash t then we can easily create a new container at a image using either the image

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I.D. or the image tag.

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So for example if we go back over to our post service we can do a docker build a dash T and then usually

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we'll put in our Docker I.D. which for me is Steven greater flash and then the name of our project.

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So for us to be posts then after that we'd put in a dot to specify that we want to build this image

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out of the current directory that we're in.

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So I would run that the build runs very quickly because I've not made any changes to it from the last

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video and now I can create an image out personally a container of this image using either the image

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I.D. That's right there or the tag that is right there once we have built the image we can create and

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start a container based on it by using Docker run and then providing either the image I.D. or the tag.

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So for example I could now do Docker run Steven Greider slash posts like so and there we go there's

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our post service.

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Next up whenever we start up a container we can either just use Docker and by itself or alternatively

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we can override the default command of the container by providing both that I.T. flag right there and

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then the command that we want to execute instead the default one right there at the very end.

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So for example I could start up that postal service container that we just created and start up a shell

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inside there.

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So essentially a terminal window inside that container rather than actually running the default command

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which is NPM starts.

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So we could do a docker run dash I.T. Steven Greider posts and I would put an S H which will start up

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a shell inside there s h is short for the word shell.

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It is a very specific type of shell essentially equivalent to if you're running bash right now on your

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computer.

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And so now rather than running our server inside there I've got a shell running and inside of here I

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can run a typical commands all being executed inside of that container.

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So if I do an L S I'll see all of the files that have been built inside of that image or again change

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to the or seeing the container where I can change my root directory and prints out all the files and

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folders inside of their and then if I want to exit I can hit command D I always smash commands or control

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C out of habit but control or command D OK next comment.

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Docker P.S. we can use this to print out information about all the containers that we are currently

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running.

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So for example if we start up a container in one terminal window and then open up a second terminal

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window into a docker PSN there we'll see the idea of the running container.

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The image it is using the command that was used to start it up.

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How long ago he was created and so on.

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Once a container is running we can also execute arbitrary commands inside of it.

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So for example we could do a docker exact dash I.T. then put in the container I.D. and then the command

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that we want to actually run inside there.

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So for example if I wanted to start up a shell inside of my running post service right now I could take

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that container I.D. I could do a docker exact dash I.T. within that I.D. And then once again run as

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H.

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And that will start up a shell inside that running container

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and then finally one more very useful command is Docker logs.

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This will printout all the logs that have been executed to be emitted by the primary process inside

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of that container.

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So for example if I flip back over I'm going to stop the running container

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all then start it back up but I'm not going to override the default command.

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So we'll do it a docker run even greater post.

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And so as soon as I start this up our primary process which is that NPM start command is emitting some

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different logs here over standard out.

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That's everything we see right here.

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I can get all that information printed out inside of a second terminal window by doing a docker.

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P.S. getting the new container I.D. and then a docker logs and provide the relevant container I.D. and

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that will essentially show me everything that primary process has emitted.

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So again just some very basic commands we are going to be using these commands quite a bit.

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And again we'll be running kind of variance of them in the Cuban 80s world in just a little bit as well

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to just inspect what's going on inside of all of our different containers Well at this point we have

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seen how to make use of Docker how to build an image.

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We've made an image out of just the post service.

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So let's take a quick pause right here.

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When we come back the next video we're going to take that darker file and darker ignore.

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And we're going to copy it over to all of our different other services as well.