Flatcar Container Linux Tech demos, 10 Aug 2017

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From YouTube: An Introduction to kube-spawn: local, multi-node Kubernetes clusters made easy

Description

kube-spawn is a tool for creating a multi-node Kubernetes cluster on a single Linux machine, created mostly for developers of Kubernetes but should also be useful for just trying things out.

Github: https://github.com/kinvolk/kube-spawn/

Created by http://kinvolk.io
Twitter: https://twitter.com/kinvolkio

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Hi my name's chris and m yago and we're from kinfolk we've got a tool that we've.

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Been working on at kinfolk called cube, spawn it's a tool for spinning up multi.

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Node local clusters using um kubernetes clusters on linux machines. It does this.

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By using os containers which are very similar to app containers and that they.

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Run on the host kernel, but you have an entire operating system and in this case.

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We're using the korres container linux operating system image so and what we're.

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Going to do we're going to show what how cute phone sets this up using the up.

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Command and then we're going to deploy a demonstration or application called.

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Micro services, demo or sock shop, which is created from our friends at weave.

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Works so let's get started so, let's just check our go path, pretty standard.

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Education and we're currently in the cube spawn repository directory under.

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The go pal so yeah. Unfortunately, we do actually have to disable selinux as.

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There's an a problem with pulling images with machine cdl on fedora 26, which.

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We're running on so we can see that we actually pre fetched this chorus. Linux.

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Image is a little large, so we're trying to save time and but we have not created.

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Any machines, okay, so let's run the cube, long up command.

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We're going to create a cluster with three nodes: you do that, just with using.

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The up sub command and telling it how many nodes you want. So what this does it.

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Will do the fetching of the image for you if you haven't done that already.

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It will provision the nodes and set them up, and then it uses cube atm to set up.

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Kubernetes on those nodes- and this takes a little bit of time on the where we're.

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At right now takes the longest, so we'll actually cut back to this once that's.

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All over so we're back so there are kubernetes cluster is set.

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Up, let's set up our cube, config environment variable alright, and let's.

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See what the state of our nodes are they're, not quite ready yet so this.

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Gives us a little bit of time to look around and see what cube spawn created.

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For us, in the current directory, you will find a dot cube spawn directory. This is.

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Where cubes spawn puts the cube, config file and it has for each node there's a.

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Directory- and there is a mouth point, this is the mount point for the very lib.

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Docker inside of each node there's also token, and then there's the.

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Extras directory has a so cat binary in it because chorus container linux does.

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Not include that, so we mount that in there so that we can do port forwarding.

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All right, so, let's take a look at the state of our.

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Nodes again, these nodes need to be ready, so we can do the deployment all right.

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Cool they're ready note that a cube spawn zero is the master. The others are.

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The working nodes all right, so let's go to the other tab here.

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Here we are in the deploy, slash, kubernetes directory of the micro.

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Services demo repository and inside of there, yes, sir, set that again.

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So what we need first need to do is set up our namespace. It requires a soft.

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Shop namespace and then we can simply do a huge gto. Oh, we want to look at it. Okay,.

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So what do we find here iago? So we have the demo size for the sub shop.

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Application, so we have some deployments some services. As you can see, this is a.

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Micro service application, so it has a lot of things. There's a micro service.

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For cards, I like the service for the catalog database for the catalog itself, so a lot of micro service as mysql mongodb, and I.

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Think rabbit in queue yeah. So let's deploy us okie dokie.

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So this is being deployed on to the few minutes cluster and that's done, but.

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Let's check the: what we want to do is check the state of the pods that.

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Namespace all right, so these are still getting ready.

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The pods are running and ready, so this means we can actually take a look at the.

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Phoque shop application so but first we need to know the ip address of this yeah.

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So you can see that there's a service for the front end and externality is.

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Notes so that means it uses yeah, so you can access any worker node on this board.

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And you will access the actual shop? Yes, but how do we get those.

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It was very node ip address, yeah, let's figure out that by writing machine.

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Detail so we can see our three nodes here and the idea dresses. So, as we said.

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Before the zero is the master, and so we will get number two, for example, so this.

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Ip and then we'll use this board, 30,000 won and there we go. We've docks so yeah.

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We're actually running a rather complicated or you know, complex.

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Application on top of our local multi node kubernetes cluster and that's.

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Actually, what we wanted to show, so I guess we're pretty much finished here.

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And we probably want to know how to stop the kubernetes cluster right sure so.

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There are some that I command flex guarantee one terminal. Now, that's a.

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Command. Stop! That's basically! Okay! That's it.

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Yeah, so I hope you find this tool useful as useful as we do in testing. You know.

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It was basically originally made for testing kubernetes patches, but we find.

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It also interesting just to play around with kubernetes, and you know to learn.

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More about it, so yeah thanks bye,.