Deploy the icinga2-master helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

Deploying the `icinga2-master` Helm chart on the Digital Ocean Kubernetes Service (DOKS) involves a few key steps:

1. **Setting up a Digital Ocean Kubernetes Cluster**: First, we will create a Kubernetes cluster on Digital Ocean using the `digitalocean.KubernetesCluster` resource. This will ensure we have a Kubernetes environment where we can deploy our Helm chart.

2. **Deploying the icinga2-master Helm chart**: After setting up the cluster, we will use the `kubernetes.helm.v3.Chart` resource from the Kubernetes provider to deploy the `icinga2-master` Helm chart. This resource allows us to specify the chart that we want to deploy, as well as the values we want to use for our configuration.

Here's the Pulumi program in TypeScript to accomplish these steps:

```typescript
import * as digitalocean from "@pulumi/digitalocean";
import * as k8s from "@pulumi/kubernetes";
import * as pulumi from "@pulumi/pulumi";

// Create a Digital Ocean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1",
    version: "latest",
    nodePool: {
        size: "s-2vcpu-2gb",
        nodeCount: 2,
    },
});

// Create a Kubernetes provider instance using the kubeconfig from our cluster
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Deploy the icinga2-master Helm chart using the Kubernetes provider
const icinga2MasterChart = new k8s.helm.v3.Chart("icinga2-master", {
    chart: "icinga2-master",
    // You can specify the Helm chart repository URL with `repo`, if it's not in the default Helm repo.
    // repo: "https://charts.icinga.com/icinga",
    values: {
        // Custom values for the Icinga2 Helm chart can go here.
        // For example:
        // resources: { limits: { cpu: "100m", memory: "256Mi" }, requests: { cpu: "100m", memory: "256Mi" } },
    },
}, { provider: k8sProvider });

// Export the cluster's kubeconfig and the icinga2 deployment status
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
export const icinga2Ready = icinga2MasterChart.getResourceProperty("v1/Service", "icinga2-master", "status");
```

Explanation of code:

- We import the required packages for Pulumi, DigitalOcean, and Kubernetes.
  
- We declare a Kubernetes cluster on Digital Ocean by creating an instance of `digitalocean.KubernetesCluster`. It is set up with a specified region, the latest version, and the desired node pool configuration. We use a small node size here (`s-2vcpu-2gb`) for this example, but for a production-ready Icinga2 setup, you may want to choose nodes with more resources.

- We use the `kubeConfigs` output property from our Digital Ocean Kubernetes cluster resource to initialize a Kubernetes provider. This provider configures Pulumi to communicate with the new Digital Ocean Kubernetes cluster.

- Next, we create a Helm chart resource, pointing to the `icinga2-master` chart. This assumes the `icinga2-master` chart is available in the Helm chart repository you are using. If the chart is hosted in a different repository, you would include the `repo` property with the URL to that repository.

- Finally, we export the kubeconfig and the status of the Icinga2 service for use outside of Pulumi. The `kubeconfig` allows us to interact with our Kubernetes cluster using `kubectl` or other Kubernetes tools. The `icinga2Ready` export can be used to check if the Icinga2 service is running as expected.

Ensure that you have Pulumi and the Digital Ocean command-line tools set up with access to your account. You can run this Pulumi program by saving it to a `index.ts` file, running `pulumi up`, and following the prompts from the CLI. If you’re using this Helm chart for the first time, check the chart's documentation for the available configuration options, as they will need to be passed in the `values` property of the Helm chart resource.