Deploy the syslog-forwarder helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `syslog-forwarder` Helm chart on Digital Ocean Kubernetes Service (DOKS), we need to follow several steps using Pulumi with the Digital Ocean and Kubernetes providers. You will need to have a Digital Ocean account and have Pulumi installed and configured on your machine to use the code provided.

First, I will walk you through what the Pulumi program will do:
1. Set up a Digital Ocean Kubernetes Cluster using the DigitalOcean provider.
2. Deploy a Helm chart onto the Kubernetes cluster using the Kubernetes provider.

Here's a breakdown of how you could structure your Pulumi project in TypeScript:

1. **Define the DOKS cluster**: We will create a new Kubernetes cluster in Digital Ocean. The configuration will specify parameters like the region, version, node size, and number of nodes.

2. **Deploy Helm chart**: Once the cluster is provisioned, we will configure the Kubernetes provider to deploy the `syslog-forwarder` Helm chart. The Helm chart will be deployed to the `default` namespace, assuming that the Helm chart you are referring to is available in the public Helm chart repositories. If it's a private repository or requires specific configurations, you would need to adjust the code accordingly.

Now, let's write the Pulumi program to achieve this:

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

// Specify the Digital Ocean region where the Kubernetes cluster will be deployed
const region = "nyc3"; // This is an example region, you can change this as needed

// Create a Digital Ocean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: region,
    version: "latest", // Use the latest available version or specify a version like "1.21.5-do.0"
    nodePool: {
        name: "default-pool",
        size: "s-2vcpu-2gb", // This is an example node size, adjust this based on your needs
        nodeCount: 2, // The number of nodes in the node pool
    },
});

// Export the kubeconfig to interact with the cluster using kubectl
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Configure the Kubernetes provider to use the created cluster's kubeconfig
const provider = new k8s.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Deploy the syslog-forwarder Helm chart to the Kubernetes cluster
const syslogForwarderChart = new k8s.helm.v3.Chart("syslog-forwarder", {
    chart: "syslog-forwarder",
    version: "1.0.0", // Replace with the specific chart version you want to deploy
    fetchOpts: {
        repo: "https://charts.example.com/", // Replace with the Helm chart repository URL
    },
}, { provider });

// Export the cluster name and kubeconfig file
export const clusterName = cluster.name;
```

Here's what each part does:

- We import the necessary Pulumi libraries for Digital Ocean and Kubernetes.
- We define the region and create a Digital Ocean Kubernetes Cluster resource, specifying the version, region, size, and count of nodes in the cluster.
- A kubeconfig file is obtained from the cluster, which allows us to interact with the cluster using `kubectl` and other Kubernetes tools.
- We initialize the Kubernetes provider plugin with the kubeconfig, thereby allowing Pulumi to interact with our Kubernetes cluster and apply changes to it.
- We declare a Helm chart resource for the `syslog-forwarder` and specify its version and repository. The Helm release is then managed by Pulumi under the created Kubernetes provider context.
- Finally, we export the names of the cluster and the raw kubeconfig string, which you might need for future reference or manual interactions with the cluster.

To apply this Pulumi program:

1. Save the code in a TypeScript file, for example `index.ts`.
2. Run `pulumi up` in the command line to create the resources in your Digital Ocean account.
3. You can get the exported values with `pulumi stack output` once your Pulumi stack is successfully updated.

Remember to review the specific requirements for the `syslog-forwarder` Helm chart to ensure all necessary values are properly configured. If you need to specify custom values or if the Helm chart is not available in a public repository, you will have to adjust the Helm chart resource defined in the Pulumi program accordingly.