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Enter the following command to delete the remaining puzzle pod. We will go into the main service endpoints and architecture in more detail after running the application. The proxy's work is done, so go ahead and stop it. Curious to learn more about Kubernetes? 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. When a puzzle pod instance goes up or down, the puzzle pod sends this information to the monitor-scale pod. Runs up and down crossword. Mongo – A MongoDB container for persisting crossword answers. 04 or higher, use the following terminal commands. We will create three K8s Services so that the applications can communicate with one another. Running the Kr8sswordz Puzzle App. This script follows the same build proxy, push, and deploy steps that the other services followed. 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). Charts are stored in a repository and versioned with releases so that cluster state can be maintained.
Giving the Kr8sswordz Puzzle a Spin. Start the web application in your default browser. Make sure the registry and jenkins pods are up and running. Push the monitor-scale image to the registry.
Kubectl get ingress. When the Reload button is pressed, answers are retrieved with a GET request in MongoDB, and the etcd client is used to cache answers with a 30 second TTL. Check to see if the frontend has been deployed. You can see these new pods by entering kubectl get pods in a separate terminal window. You can check the cluster status and view all the pods that are running.
On macOS, download the NodeJS installer, and then double-click the file to install NodeJS and npm. 1:30400/ monitor-scale:'`git rev-parse --short HEAD`'#' applications/monitor-scale/k8s/ | kubectl apply -f -. If you previously stopped Minikube, you'll need to start it up again. If you did not allocate 8 GB of memory to Minikube, we suggest not exceeding 6 scaled instances using the slider. Runs up and down crosswords. Now that it's up and running, let's give the Kr8sswordz puzzle a try. You can check if there's any process currently using this port by running the command. Monitor-scale persists the list of available puzzle pods in etcd with set, delete, and get pod requests.
Kubernetes is automatically balancing the load across all available pod instances. David's also helped design and deliver training sessions on Microservices for multiple client teams. Notice the number of puzzle services increase. Bootstrap the kr8sswordz frontend web application. In the manifests/ you'll find the specs for the following K8s Objects. For now, let's get going!
What's Happening on the Backend. In a terminal, run kubectl get pods to see the puzzle services terminating. After moving to the United States, he studied received his master's degree in computer science at Maharishi University of Management. The monitor-scale pod handles scaling and load test functionality for the app. View deployments to see the monitor-scale deployment. Docker build -t socat-registry -f applications/socat/Dockerfile applications/socat. Drag the middle slider back down to 1 and click Scale. To use the automated scripts, you'll need to install NodeJS and npm. 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. Copy the puzzle pod name (similar to the one shown in the picture above). In a terminal, run kubectl get pods to see the new replicas.
Helm is a package manager that deploys a Chart (or package) onto a K8s cluster with all the resources and dependencies needed for the application. The GET also caches those same answers in etcd with a 30 sec TTL (time to live). View pods to see the monitor-scale pod running. 1:30400/monitor-scale:`git rev-parse --short HEAD` -f applications/monitor-scale/Dockerfile applications/monitor-scale. Underneath, the chart generates Kubernetes deployment manifests for the application using templates that replace environment configuration values. This tutorial only runs locally in Minikube and will not work on the cloud. Etcd – An etcd cluster for caching crossword answers (this is separate from the etcd cluster used by the K8s Control Plane).
The puzzle service sends Hits to monitor-scale whenever it receives a request. Notice how it very quickly hits several of the puzzle services (the ones that flash white) to manage the numerous requests. Kubectl get deployments. Now that we've run our Kr8sswordz Puzzle app, the next step is to set up CI/CD for our app. Monitor-scale then uses websockets to broadcast to the UI to have pod instances light up green. 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.
To quickly install NodeJS and npm on Ubuntu 16. Did you notice the green arrow on the right as you clicked Reload? Now we're going to walk through an initial build of the monitor-scale application. The up and down states are configured as lifecycle hooks in the puzzle pod k8s deployment, which curls the same endpoint on monitor-scale (see kubernetes-ci-cd/applications/crossword/k8s/ to view the hooks). For best performance, reboot your computer and keep the number of running apps to a minimum. The puzzle service uses a LoopBack data source to store answers in MongoDB. Press Enter to proceed running each command. He was born and raised in Colombia, where he studied his BE in Systems Engineering.
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. Check to see that all the pods are running. In Part 3, we are going to set aside the Hello-Kenzan application and get to the main event: running our Kr8sswordz Puzzle application. We will run a script to bootstrap the puzzle and mongo services, creating Docker images and storing them in the local registry. Kubectl get services. As a separate watcher, it monitors the state of the application, and acts to align the application with a given specification as events occur.
Monitor-scale – A backend service that handles functionality for scaling the puzzle service up and down. 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. Docker stop socat-registry. The crossword application is a multi-tier application whose services depend on each other. When you click Submit, your current answers for the puzzle are stored in MongoDB. Deploy the etcd cluster and K8s Services for accessing the cluster. The script runs through the same build, proxy, push, and deploy steps we just ran through manually for both services. Kr8sswordz – A React container with our frontend UI. ServiceAccount: A "monitor-scale" ServiceAccount is assigned to the monitor-scale deployment. 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: -. You'll need a computer running an up-to-date version of Linux or macOS. We do not recommend stopping Minikube ( minikube stop) before moving on to do the tutorial in Part 4.
1:30400/monitor-scale:$BUILD_TAG#127. A. curl -sL | sudo -E bash - b. sudo apt-get install -y nodejs. Helm install stable/etcd-operator --version 0. 1:30400/monitor-scale:`git rev-parse --short HEAD`. Enter the following terminal command, and wait for the cluster to start: minikube start. We will also touch on showing caching in etcd and persistence in MongoDB. This will install Tiller (Helm's server) into our Kubernetes cluster.
Npm run part1 (or part2, part3, part4 of the blog series). In Part 2 of our series, we deployed a Jenkins pod into our Kubernetes cluster, and used Jenkins to set up a CI/CD pipeline that automated building and deploying our containerized Hello-Kenzan application in Kubernetes.