Deploy the check-mk helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the check-mk Helm chart on DigitalOcean Kubernetes Service using Pulumi, we will perform the following steps:

1. **Set Up a DigitalOcean Kubernetes Cluster**: We will create a new Kubernetes cluster in your DigitalOcean account. This cluster will be the environment where your check-mk instance will run.

2. **Deploy the Helm Chart**: Once the cluster is up and running, we will use the `kubernetes` provider to install the check-mk Helm chart onto the cluster.

For this program, you will need a DigitalOcean account, a DigitalOcean Personal Access Token, and you must have Pulumi and the DigitalOcean CLI tool installed and configured.

Here's how you could write the Pulumi program in TypeScript:

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

// Step 1: Create a DigitalOcean Kubernetes Cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1",
    version: "latest", // You can specify a specific version of Kubernetes
    nodePool: {
        name: "default",
        size: "s-2vcpu-2gb", // This is the smallest size available, adjust based on your needs.
        nodeCount: 1,
    },
});

// Step 2: Deploy the check-mk Helm Chart
// First, we need to create a provider that uses the kubeconfig from our newly created DigitalOcean Kubernetes cluster.
const k8sProvider = new kubernetes.Provider("do-k8s", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Deploy the check-mk Helm chart using the Helm provider with the created Kubernetes cluster as the provider.
const checkMkChart = new kubernetes.helm.v3.Chart("check-mk-chart", {
    chart: "check-mk",
    // The Helm chart can be sourced from any Helm chart repository, here is an example repo
    // Assuming that 'check-mk' is available in the repository.
    fetchOpts: {
        repo: "https://helm.example.com/charts",
    },
    // Provide any custom values to the Helm chart:
    values: {
        // e.g., setup service with type LoadBalancer so it's accessible from the internet:
        service: {
            type: "LoadBalancer",
        },
        // Add any other custom values required for your check-mk deployment.
    },
}, { provider: k8sProvider });

// Export the DigitalOcean Kubernetes cluster's kubeconfig and service endpoint
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
export const serviceEndpoint = checkMkChart.getResourceProperty("v1/Service", "check-mk-chart", "status").apply(status => status.loadBalancer.ingress[0].ip);
```

Explanation of the code:
- The `digitalocean.KubernetesCluster` resource defines the cluster with its region, Kubernetes version, and the node pool configuration, including size and count.
- The `kubernetes.Provider` resource establishes the connection to the Kubernetes cluster using its kubeconfig, making it available for further deployments.
- The `kubernetes.helm.v3.Chart` resource is used to deploy the check-mk Helm chart to the cluster. You need to specify the name of the Helm chart and optionally adjust the `repo` to the URL of the Helm chart repository containing the check-mk chart.
- The `values` section in the `Chart` resource is a place to put any configuration that the Helm chart accepts in order to customize the deployment of check-mk.
- Finally, two outputs are exported: the kubeconfig to connect to the cluster and the service endpoint that can be used to access the check-mk application once deployed.

Make sure the Helm chart's name and repository are correctly set to match where the check-mk chart is located in a Helm repository. If you need any custom configurations specific to check-mk that are available in the chart, you should add them in the `values` object.