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In this video we're going to start to write out a config file for a deployment.

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So let's get to it.

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Back inside.

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My code Ed I'm going to delete the post dot gamble file if you want to.

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You can back up this file or just change the extension.

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Something like that you want to make sure you don't have this file anymore.

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So if you want to keep a backup I would encourage you to add on a like dot old or something like that

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extension to the very end.

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Going to delete that file because we don't want to create an individual pod anymore and then inside

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my aids directory I'm gonna make a new file called Post dash devil dot yellow devil on there indicates

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that this file is going to create a deployment.

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So devil is just deployment for short.

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That's all inside if you're ever gonna write out.

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Once again some config to create a deployment inside this config we're going to say that we want to

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run some number of pods that are going to run our post image.

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So let's get to it a lot.

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The code or configuration we're going to write inside of here is going to be very similar to the stuff

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that we just wrote out for a pod.

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Well first start off with an API version and in this case they're going to put an apps slash V1.

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So remember there are certain buckets of different types of objects we have access to.

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In this case the deployment is inside this bucket of different objects called Apps slash be one a pod

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as you will recall was inside of just the one will then specify the kind of object that we're trying

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to create.

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It's a deployment will then set up some metadata.

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And in this case we're just going to assign a name to it.

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So let's say posts dash devil that is going to be the name of my deployment again I'm putting on the

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dash depot here so that if I ever print out some logs or something like that about all the objects inside

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my cluster I'll see double.

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And know that this is a deployment after that I'll put in a spec section but this is going to specify

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exactly how this deployment should behave the first property will designate inside of here is replicas

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and I'm gonna give it a one for right now replicas is the number of pods we want to create running some

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particular image so in this diagram over here I'm showing three separate pods.

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Right now we're not going to run three separate pods we're going to run just one by itself.

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Now the next a little piece of configuration here is going to be just a little bit mysterious.

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So we'll write it out and then take it right out a little bit additional config after that and we'll

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talk about how these two parts of config kind of work together.

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So going to say selector then match labels and then app post remember that inside of a gamble file indentation

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is a big deal.

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So you need to make sure that you've got one level of indentation on selector then two and then three.

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So again we'll talk about what this is in just a second.

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First we're gonna write out another little bit of config I'm gonna say template then metadata labels

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and then app notes all right.

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So these two sections right here the selector thing and this metadata thing right here are really working

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together.

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This might sound really in it's funny it might sound like crazy but to be honest with you a deployment

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kind of has a hard time figuring out which pods it should manage inside of our cluster.

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In other words if a set of pods get created we have to somehow give the deployment some information

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and tell it hey these pods over here.

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These are the ones you need to manage and that's what the goal of this selector and metadata labels

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app thing is all about the selector right here is saying take a look at all the different pods that

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have been created by an all the pods with a label of app os.

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So this right here is what I refer to as a label as essentially well a label.

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It's a key value pair that is just applying some arbitrary information to a pod app right here doesn't

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really have any special meaning.

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We can set up labels with any structure you can imagine so we can have a label of like that right there.

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So in this case we are telling the deployment that we wanted to find all the different pods with the

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label of app hosts and those are the pods that it should be in charge of then inside this template section.

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The template is where we specify the exact configuration of a pod that we want this deployment to create

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so this right here is some configuration that is going to be applied to the pod that the deployment

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is going to make.

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We are saying that we want the pod to have a label of app posts.

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So again this part right here and this part right here are really working together to tell the deployment

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about which pods it should try to manage after that will then set up a spec this back again.

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Everything inside this template thing right here can be really thought of as a pod spec or a pod config

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file very similar to the pod config file we had just a moment ago to the spec section right here is

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describing the specification or the configuration options where the pod that we're trying to make so

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we will designate containers we're going to have one container so containers is an array remember and

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inside of a gamble we designate an array entry with a single Dash.

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We'll say that the container should have a name of post and it should run the image of your dock or

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I.D. so not mine whatever your Docker I.D. is flash posts and then version 0 0 1.

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Like so and that's it.

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That is our deployment config.

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Now over time you're going to see that there are many other options or pieces of configuration we can

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specify in here.

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This is about as barebones a configuration as we can get when we are creating a deployment let's save

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this.

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And then finally we're going to go back over to our terminal and we're going to try to apply this to

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our cluster.

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Remember anytime we want to make a change or a cluster recreate those config files then we will run

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that cube GTL apply command that we saw that we used just a moment ago to create a pod.

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So to apply this config file we will run cube Seitel apply dash F and then post devil dot yellow and

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that's it.

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Now the deployment has been created but what does that really do for us.

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Well let's take a quick pause right here.

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We're gonna come back the next video and we'll see what creating the deployment really did to our cluster.