Deploy the gitserver helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a Helm chart to a Kubernetes cluster using Pulumi, you'll make use of the `kubernetes.helm.v3.Chart` resource from Pulumi's Kubernetes provider. This resource allows you to deploy Helm charts just as you would with the helm command-line tool.

Below, I will walk you through a Pulumi TypeScript program that deploys a Helm chart named `gitserver` to a Kubernetes cluster. For this program, there are a few assumptions:

1. You have a Kubernetes cluster already set up and running.
2. You have configured `kubectl` with access to this cluster, and Pulumi will use this configuration to communicate with the cluster.
3. The `gitserver` Helm chart is available in a public or private repository that is accessible from your Kubernetes cluster.

Here's the breakdown of what the program will do:

1. The program will import the necessary Pulumi and Kubernetes packages.
2. It will then define a new Helm chart resource, specifying the chart name, version, and repository, if it's not from the default Helm repository.
3. The deployment will occur in the specified namespace, which you will need to create beforehand or make sure it exists.

Now let's see the code:

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

// Replace these variables according to your requirements.
const chartName = "gitserver"; // The name of the Helm chart you want to deploy.
const chartVersion = "1.0.0"; // Specify the version of the chart.
const chartRepository = "https://charts.example.com/"; // The repository URL where the chart is located.
const chartNamespace = "production"; // The namespace where the chart should be deployed.

// Deploy a new Helm chart instance of "gitserver".
const gitserverChart = new k8s.helm.v3.Chart("gitserver-helm-chart", {
    chart: chartName,
    version: chartVersion,
    fetchOpts: {
        repo: chartRepository,
    },
    namespace: chartNamespace,
}, { provider: k8sProvider });

// Export the URL to access the Git server.
// This assumes that the Helm Chart creates a Service with an external LoadBalancer.
export const gitServerUrl = gitserverChart.getResourceProperty('v1/Service', 'gitserver', 'status').apply(status => {
    const ingress = status.loadBalancer.ingress[0];
    return ingress.ip || ingress.hostname;
});
```

This program uses Pulumi's Kubernetes provider to interact with your Kubernetes cluster. It specifies that we wish to deploy a `gitserver` Helm chart located at the given `chartRepository`. Then, it assumes the Helm chart defines a `Service` that, once deployed, results in the creation of an external LoadBalancer from which we can extract the IP or hostname to access the Git server. The load balancer URL is then exported as a stack output which you can use to access your Git server.

Note that the `getResourceProperty` function is used to get the IP or hostname from the Service status. This function may need to be adjusted depending on the specifics of your Helm chart's Service object.

To use the above program:

1. Save the code to a file named `index.ts`.
2. Ensure that you have Pulumi installed and set up. Visit the [Pulumi installation guide](https://www.pulumi.com/docs/get-started/install/) for instructions if necessary.
3. Initialize a new Pulumi project using `pulumi new typescript`.
4. Replace the content of `index.ts` with the code provided above.
5. Run `pulumi up` to execute the deployment.

Remember, for the above program to work, the Helm chart must be properly configured to expose a service. Otherwise, you would need to adjust the code to fit the actual output of your Helm chart.