Make sure the registry and jenkins pods are up and running. Open the registry UI and verify that the monitor-scale image is in our local registry. Kubectl rollout status deployment/puzzle kubectl rollout status deployment/mongo. An operator is a custom controller for managing complex or stateful applications. Running the Kr8sswordz Puzzle App. Crossword for run up. In a terminal, run kubectl get pods to see the new replicas. This is not a ClusterRole kind of object, which means it will only work on a specific namespace (in our case "default") as opposed to being cluster-wide. View services to see the monitor-scale service. Drag the lower slider to the right to 250 requests, and click Load Test. When the Scale button is pressed, the monitor-scale pod uses the Kubectl API to scale the number of puzzle pods up and down in Kubernetes. On Linux, follow the NodeJS installation steps for your distribution. If you previously stopped Minikube, you'll need to start it up again. Monitor-scale – A backend service that handles functionality for scaling the puzzle service up and down.
Mongo – A MongoDB container for persisting crossword answers. Kubectl apply -f manifests/. On macOS, download the NodeJS installer, and then double-click the file to install NodeJS and npm. Once again we'll need to set up the Socat Registry proxy container to push the monitor-scale image to our registry, so let's build it. 1. pod instance of the puzzle service.
Try filling out some of the answers to the puzzle. We will run a script to bootstrap the puzzle and mongo services, creating Docker images and storing them in the local registry. 1:30400/ monitor-scale:'`git rev-parse --short HEAD`'#' applications/monitor-scale/k8s/ | kubectl apply -f -. Kubectl get deployments. View deployments to see the monitor-scale deployment. Goes up and down and up crossword. RoleBinding: A "monitor-scale-puzzle-scaler" RoleBinding binds together the aforementioned objects. Check to see if the frontend has been deployed.
This will install Tiller (Helm's server) into our Kubernetes cluster. The puzzle service sends Hits to monitor-scale whenever it receives a request. Runs up and down crossword. This article was revised and updated by David Zuluaga, a front end developer at Kenzan. Deploy the etcd cluster and K8s Services for accessing the cluster. To quickly install NodeJS and npm on Ubuntu 16. We'll also spin up several backend service instances and hammer it with a load test to see how Kubernetes automatically balances the load.
Now that we've run our Kr8sswordz Puzzle app, the next step is to set up CI/CD for our app. This script follows the same build proxy, push, and deploy steps that the other services followed. Enter the following terminal command, and wait for the cluster to start: minikube start. Upon restart, it may create some issues with the etcd cluster.
Copy the puzzle pod name (similar to the one shown in the picture above). Feel free to skip this step in case the socat-registry image already exists from Part 2 (to check, run docker images). We will also touch on showing caching in etcd and persistence in MongoDB. We will create three K8s Services so that the applications can communicate with one another. If you need to walk through the steps we did again (or do so quickly), we've provided npm scripts that will automate running the same commands in a terminal. Check to see that all the pods are running. Monitor-scale persists the list of available puzzle pods in etcd with set, delete, and get pod requests. Etcd – An etcd cluster for caching crossword answers (this is separate from the etcd cluster used by the K8s Control Plane). What's Happening on the Backend.
Let's take a closer look at what's happening on the backend of the Kr8sswordz Puzzle app to make this functionality apparent. You can check if there's any process currently using this port by running the command. Scale the number of instances of the Kr8sswordz puzzle service up to 16 by dragging the upper slider all the way to the right, then click Scale. For now, let's get going! The crossword application is a multi-tier application whose services depend on each other. The cluster runs as three pod instances for redundancy. Curious to learn more about Kubernetes? Bootstrap the kr8sswordz frontend web application. Kubernetes is automatically balancing the load across all available pod instances.
Check to see if the puzzle and mongo services have been deployed. This step will fail if local port 30400 is currently in use by another process. Wait for the monitor-scale deployment to finish. You'll see that any wrong answers are automatically shown in red as letters are filled in. Charts are stored in a repository and versioned with releases so that cluster state can be maintained. In a terminal enter kubectl get pods to see all pods. Docker stop socat-registry. Minikube service kr8sswordz. The proxy's work is done, so go ahead and stop it. Helm install stable/etcd-operator --version 0. View ingress rules to see the monitor-scale ingress rule.
1:30400/monitor-scale:`git rev-parse --short HEAD`. Minikube service registry-ui. Try filling out the puzzle a bit more, then click Reload once. You can check the cluster status and view all the pods that are running. C. Enter kubectl get pods to see the old pod terminating and the new pod starting. Run the proxy container from the newly created image.
So far we have been creating deployments directly using K8s manifests, and have not yet used Helm. You should see the new puzzle pod appear in the Kr8sswordz Puzzle app. 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. Npm run part1 (or part2, part3, part4 of the blog series). After moving to the United States, he studied received his master's degree in computer science at Maharishi University of Management.
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