Kubernetes is automatically balancing the load across all available pod instances. Kubectl rollout status deployment/kr8sswordz. We will showcase the built-in UI functionality to scale backend service pods up and down using the Kubernetes API, and also simulate a load test. Kubectl delete pod [puzzle podname]. Giving the Kr8sswordz Puzzle a Spin. Notice the number of puzzle services increase. To simulate a real life scenario, we are leveraging the github commit id to tag all our service images, as shown in this command ( git rev-parse –short HEAD). Before we start the install, it's helpful to take a look at the pods we'll run as part of the Kr8sswordz Puzzle app: -. We will also modify a bit of code to enhance the application and enable our Submit button to show white hits on the puzzle service instances in the UI. Goes up and down and up crossword. We do not recommend stopping Minikube ( minikube stop) before moving on to do the tutorial in Part 4. In Part 3, we are going to set aside the Hello-Kenzan application and get to the main event: running our Kr8sswordz Puzzle application. An operator is a custom controller for managing complex or stateful applications.
Kr8sswordz – A React container with our frontend UI. Etcd – An etcd cluster for caching crossword answers (this is separate from the etcd cluster used by the K8s Control Plane). Let's take a closer look at what's happening on the backend of the Kr8sswordz Puzzle app to make this functionality apparent. Helm install stable/etcd-operator --version 0. Enroll in Introduction to Kubernetes, a FREE training course from The Linux Foundation, hosted on. The cluster runs as three pod instances for redundancy. Open the registry UI and verify that the monitor-scale image is in our local registry. The puzzle service sends Hits to monitor-scale whenever it receives a request. Crossword for run up. Now that it's up and running, let's give the Kr8sswordz puzzle a try. For best performance, reboot your computer and keep the number of running apps to a minimum. Curious to learn more about Kubernetes?
C. Enter kubectl get pods to see the old pod terminating and the new pod starting. If you did not allocate 8 GB of memory to Minikube, we suggest not exceeding 6 scaled instances using the slider. After moving to the United States, he studied received his master's degree in computer science at Maharishi University of Management. Similar to what we did for the Hello-Kenzan app, Part 4 will cover creating a Jenkins pipeline for the Kr8sswordz Puzzle app so that it builds at the touch of a button. Runs up and down crossword puzzle crosswords. To quickly install NodeJS and npm on Ubuntu 16. When a puzzle pod instance goes up or down, the puzzle pod sends this information to the monitor-scale pod.
We'll see later how Jenkins plugin can do this automatically. What's Happening on the Backend. Monitor-scale has the functionality to let us scale our puzzle app up and down through the Kr8sswordz UI, therefore we'll need to do some RBAC work in order to provide monitor-scale with the proper rights. This tutorial only runs locally in Minikube and will not work on the cloud. Press Enter to proceed running each command. Drag the middle slider back down to 1 and click Scale. View pods to see the monitor-scale pod running. The script runs through the same build, proxy, push, and deploy steps we just ran through manually for both services. Charts are stored in a repository and versioned with releases so that cluster state can be maintained. 1. pod instance of the puzzle service. Docker build -t 127. The sed command is replacing the $BUILD_TAG substring from the manifest file with the actual build tag value used in the previous docker build command. When you click Submit, your current answers for the puzzle are stored in MongoDB. Check to see if the puzzle and mongo services have been deployed.
We will also touch on showing caching in etcd and persistence in MongoDB. When the Load Test button is pressed, the monitor-scale pod handles the loadtest by sending several GET requests to the service pods based on the count sent from the front end. Bootstrap the kr8sswordz frontend web application. Monitor-scale – A backend service that handles functionality for scaling the puzzle service up and down. Did you notice the green arrow on the right as you clicked Reload? We've seen a bit of Kubernetes magic, showing how pods can be scaled for load, how Kubernetes automatically handles load balancing of requests, as well as how Pods are self-healed when they go down. Now that we've run our Kr8sswordz Puzzle app, the next step is to set up CI/CD for our app. Deploy the etcd cluster and K8s Services for accessing the cluster. Wait for the monitor-scale deployment to finish. Check to see if the frontend has been deployed.
We'll also spin up several backend service instances and hammer it with a load test to see how Kubernetes automatically balances the load. Upon restart, it may create some issues with the etcd cluster. The puzzle service uses a LoopBack data source to store answers in MongoDB.
Try filling out the puzzle a bit more, then click Reload once. On macOS, download the NodeJS installer, and then double-click the file to install NodeJS and npm. Try filling out some of the answers to the puzzle. Kubectl get services.
Docker build -t socat-registry -f applications/socat/Dockerfile applications/socat. We will create three K8s Services so that the applications can communicate with one another. Now run a load test. First make sure you've run through the steps in Part 1 and Part 2, in which we set up our image repository and Jenkins pods—you will need these to proceed with Part 3 (to do so quickly, you can run the part1 and part2 automated scripts detailed below). If you previously stopped Minikube, you'll need to start it up again. You can check the cluster status and view all the pods that are running.
In the case of etcd, as nodes terminate, the operator will bring up replacement nodes using snapshot data. In a terminal, run kubectl get pods to see the puzzle services terminating. You'll see that any wrong answers are automatically shown in red as letters are filled in. Mongo – A MongoDB container for persisting crossword answers. Kubectl rollout status deployment/puzzle kubectl rollout status deployment/mongo.
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