1. Deploy the pubsub-emulator helm chart on Digital Ocean Kubernetes Service


    To deploy the pubsub-emulator Helm chart on DigitalOcean's Managed Kubernetes Service (DOKS), you'll follow these steps:

    1. Set up a new DigitalOcean Kubernetes cluster using Pulumi's digitalocean.KubernetesCluster resource.
    2. Deploy the pubsub-emulator Helm chart to the cluster using the kubernetes.helm.v3.Chart resource.

    Let's start by defining our DigitalOcean Kubernetes cluster. We'll utilize the digitalocean package in Pulumi to create a DOKS cluster. The cluster will consist of a single node pool with the smallest possible size for demonstration purposes.

    After the cluster is provisioned, we install the pubsub-emulator using the Pulumi Kubernetes provider by specifying the kubernetes.helm.v3.Chart resource. Helm is a package manager for Kubernetes that allows you to define, install, and upgrade Kubernetes applications. The Chart is a Helm package that contains all the resource definitions necessary to run an application, tool, or service inside of a Kubernetes cluster. By utilizing a Helm chart, it becomes simple to deploy services like pubsub-emulator.

    Here is the detailed TypeScript program that accomplishes these tasks:

    import * as pulumi from '@pulumi/pulumi'; import * as digitalocean from '@pulumi/digitalocean'; import * as k8s from '@pulumi/kubernetes'; // Define the DigitalOcean Kubernetes cluster const cluster = new digitalocean.KubernetesCluster('do-cluster', { // Define the region where our cluster will be created. region: digitalocean.Regions.NYC1, // Version of Kubernetes to use for the cluster version: 'latest', // Creating a single node pool with the smallest machine type for cost efficiency nodePool: { name: 'default-pool', size: digitalocean.DropletSlugs.DropletS1VCPU2GB, nodeCount: 1, // Single node is sufficient for the pubsub-emulator }, }); // Now we need to setup the Kubernetes provider to interact with the DigitalOcean cluster // The kubeconfig is obtained from the DigitalOcean Kubernetes cluster // to authenticate and communicate with the cluster. const k8sProvider = new k8s.Provider('do-k8s', { kubeconfig: cluster.kubeConfigs[0].rawConfig, }); // Deploy pubsub-emulator using the Helm chart const pubsubEmulatorChart = new k8s.helm.v3.Chart('pubsub-emulator', { chart: 'pubsub-emulator', fetchOpts: { repo: 'https://googlecloudplatform.github.io/pubsub-emulator', // Replace with the correct Helm chart repository }, }, { provider: k8sProvider }); // Export the cluster's name and kubeconfig export const clusterName = cluster.name; export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

    Here's what each section of the code does:

    • We import the necessary Pulumi packages for DigitalOcean and Kubernetes.
    • We create a new DOKS cluster with a single node in the nyc1 region using the digitalocean.KubernetesCluster class. We specify the machine size and the number of nodes.
    • We then create a Pulumi Kubernetes provider using the k8s.Provider class. This provider uses the kubeconfig from our newly created cluster to authenticate against the Kubernetes cluster.
    • We deploy the pubsub-emulator Helm chart to DOKS using the k8s.helm.v3.Chart. The repo option specifies the Helm repository where the chart is located.
    • Finally, we export the clusterName and kubeconfig, which we could use to interact with our Kubernetes cluster from our terminal or CI/CD system.

    Keep in mind that the process of setting up the cluster and deploying the application can take several minutes. Once the deployment is finished, you can check the status of the installed Helm release with kubectl using the exported kubeconfig.

    Please note that the Helm chart repository provided in the fetchOpts is just a placeholder. You would need to provide the actual URL of the repository where the pubsub-emulator chart is hosted. If pubsub-emulator is not available as a Helm chart, you would need to create your Helm chart or use an existing Docker image and define Kubernetes resources manually.

    Remember to install the Pulumi CLI and configure your DigitalOcean token by running pulumi config set digitalocean:token <YOUR_DO_TOKEN> in your terminal before running this program.