Cloud Native Computing Foundation KubeCon + CloudNativeCon China 2018 (Shanghai), 21 Apr 2021

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From YouTube: Kubernetes Explained the Easy Way, Using Computer Games... - Steven Trescinski, Gluo

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Don't miss KubeCon + CloudNativeCon 2020 events in Amsterdam March 30 - April 2, Shanghai July 28-30 and Boston November 17-20! Learn more at kubecon.io. The conference features presentations from developers and end users of Kubernetes, Prometheus, Envoy, and all of the other CNCF-hosted projects

Kubernetes Explained the Easy Way, Using Computer Games... - Steven Trescinski, Gluo

How do you explain some of the basic Kubernetes constructs (i.e. nodes, pods, rolling updates, image tags, deployments,...) together with their concrete use cases in a fun and memorable way to people that have never heard of Kubernetes before? The above was the challenge I was faced with when preparing my talk titled "Orchestrating the Container Chaos" for a group of Belgian students. So I started looking for something that most engineering students can relate to... I ended up modding a first-person shooting computer game to interact with the Kubernetes API to visualise some of the main Kubernetes constructs. During this talk I will explain the tools/technologies used and hopefully inspire others to think outside of the box when preparing for technical talks. Screenshots: https://drive.google.com/open?id=1dKeYuBJEnm9SmZjil4aAgVCtOs9D0lZT

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Hi, my name is Steven I'm from Belgium very excited to be here and instead of all the all, the other talks are probably going to focus on yeah. So again, I need to go a little bit quicker. So, instead of focusing on the technologies, we'll be focusing on how to get people excited about new technologies. One of the challenges I was facing a couple of months ago, was how to explain, kubernetes or another complicated technology to a bunch of students that have never heard about kubernetes before so.

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Your first option is, of course, create a powerpoint, throw in some architecture overview talk about the API talk about the scheduler, throw in some llamó and everything will be great and everybody will be excited.

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The result is probably something similar to this, so you need to come up with another idea, and one thing I remembered when I was learning to Banaras was one of the talks by Kelsey Hightower, where he used Tetris as a reference for kubernetes. So I thought that's a great idea.

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Let's level this up, and instead of taking Tetris I, used Garry's Mod for those who don't know Gary smart, it's it's a first-person shooter, that's highly customizable, and what we did is we added some some Lua code, so it could interact with kubernetes and we ended up with Gary's fault. I have a demo, but just to know all the the references and the links to the code is here.

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All right, so what we do now is we'll start we'll start up. Garry's Mod we'll select a map and we start the game. While the game is loading, we'll just do a cube, CT I'll get notes, so you can see that in the back back-end it's just a normal kubernetes cluster running it's running on gke. We have three nodes and after that, we'll just put a watch to see all the pots that are running inside the cluster and as you'll see, there's there's nothing running in it now.

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So what we do now is we're going to connect the game to the kubernetes api. We do it / localhost, so we need to set up a cube, CTL proxy. That's what we did now and now. The only thing that's that's left to connect the game to the cuban Eddy's api is open up a lua script.

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So that's what we're doing now and once we had to submit the game is connected to kubernetes, so you saw that we had three nodes and those three nodes are represented by the three fenced off areas inside the game. So this is all good.

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So what happens now if we deploy an application into the cluster, so we have a deployment, it has three replicas and once we deploy it will see that the bots are started and we can start seeing characters in the game appearing, so they all have their own their own in their own area, so they're on their own little eye, their own node. So the next thing what we can do is, of course we can scale this up. So, let's see scale this up to six.

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You can see the bots appear and then you'll have some additional characters in the game. So what else can we do? We can also show how you do upgrades, because this is version one of the character and we have a more sophisticated one. Is he studied? He is a professor and he wears a white coat. So we we update the image tag, and now you can see that we have new pots running with the new image and it's also inside the game.

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Now we have the application running and now the cool thing is, of course, because you're, the administrator of your cluster and your job is to protect the cluster and you from what you protected is, of course, from from your enemies. So in the games. Those are in the game that you're those are your enemies, but in real life it's going to be disk failures, memory, leaks and things like that.

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So once I select my my weapon I'm going to spawn the the bugs, and now we start the enemies and as a cluster administrator you're, looking always over your cluster, and you see that you have one of the one of the bugs that is actually attacking your application.

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So you need to work on it, but while you're fixing one problem, of course on the other nodes, there's additional issues, so you need to have a closer look and it's going to be very complicated to fix all the problems but, of course, because you're using kubernetes, you can see here on the left that the bots are always running. That's it! Thank you.