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At this point we have the ability to create a new custom image out of our Docker file and we can do

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so by running docker build dot the output from all that is this very last line right here that says

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successfully built blah blah blah.

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This is the idea of the image that was just created so we can now create a container out of this image

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by copying the idea and running Docker run and then placing the ideas in there.

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Now when we run this command an instance of our image we created we'll get a new container and inside

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that we're going to be running an instance of a server.

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So I'll hit enter and there we go we've got our copy of readies and again all the warnings.

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You can totally ignore now.

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One thing I want to point out here is that having to execute Docker run and then paste in that I.D.

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I don't have anymore about having a pasting that I.D. is kind of a pain.

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And it sure was a lot nicer earlier in the course when we were able to do stuff like just simply Docker

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run red S or Docker run.

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Hello world.

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In those cases we didn't have to memorize an I.D. to use so we can actually do the same by slightly

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changing the form of the docker build command.

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Here's what we're gonna do.

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We are going to run docker build and we're going to add on this little argument right here that is going

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to tag the image that is created and make it a lot easier to refer to it by a name that you and I can

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customize the convention for this is your Docker I.D. a slash the name of the project that you're working

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on a colon and then the version which traditionally is going to be latest whenever you are building

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the newest version of an image.

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But in general that is supposed to actually be a version.

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So traditionally a number or for the latest version of your image you simply say latest.

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Now this is a convention right here.

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You're going to see all projects in Docker trying to follow this convention as much as possible.

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And you might be wondering why some other images that we've been able to use have more simplified names

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like simply reticence or hello dash world or busy box.

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Well all those are community images.

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They're images that have been created by people in the community and kind of open source for very popular

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use anytime that you are creating an image of your own.

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You're always going to prefix it with your darker ideas.

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All right.

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So let's give this a shot and see how it works.

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So I'm going to flip back in my terminal and we are going to execute docker build dash t your Docker

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idea.

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So for me it's Steven Greider for you it's probably gonna be something else slash whatever you want

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the name of the project to be.

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So I'm going to use red as you can do red as you can do read a server.

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Really anything goes here.

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A colon and I'll say it specifically latest and then don't forget after all that stuff we still have

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to put in that dot at the very end still need to specify that built context which again is the source

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of all the files and folders that are going to going to be used to build your container out.

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One quick reminder we're not really doing a lot with this build context yet but we will use it for something

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later on in the course.

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All right.

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So once you got to all that in there we'll run that and then the output down here says successfully

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built the image I.D. but then it tagged it as this name.

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And so now we can start up a container out of this image by running Docker run and then using the name

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that we just provided of Steven Greider or whatever your tag is slash red it's and then you do not have

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to actually specify the version on the end.

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You can simply leave it as your doc right.

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You slash redness if you don't put on the version on the end then the latest version of the container

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or mutilated version of the image will be used by default so I'll run that.

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And sure enough we get our Docker image running.

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All right.

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So one last quick kind of nitpick thing I want to throw out here just because you might see some documentation

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it looks a little bit confusing.

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Technically the version number on the very end here this is technically the tag.

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Now the entire process of what we just did is known as tagging the image and even the argument we used

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was dash to you right here.

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So we call this process tag in the image but technically just the version on the end is the tag everything

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else on here is actually like the repository or the project name.

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So just a little bit of a nitpick I just want you to be aware of that.

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All right.

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So that's pretty much it.

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Let's take a quick break and we'll continue in the next section.