Deploy the mattermost-instance helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the Mattermost instance using a Helm chart on Kubernetes with Pulumi, you'll use the `kubernetes.helm.v3.Chart` resource from the Kubernetes provider. This allows you to specify the chart, version, and any overrides needed for your Mattermost deployment directly within your Pulumi program.

You'll begin by setting up a new Pulumi project and stack if you haven't already. Within this Pulumi stack, you define the Kubernetes resources needed to install Mattermost. Here, you focus on installing the Mattermost instance using the Helm chart. Usually, you'd have to have your Kubernetes cluster already set up and have `kubectl` configured to connect to it.

Here's a detailed breakdown of the `Chart` resource properties you might use:

- `chart`: Name of the Helm chart you want to deploy.
- `version`: The version of the Helm chart.
- `fetchOpts`: Any special fetch options required, such as the repository where the Helm chart is located.
- `values`: An object representing the values you want to override in the Helm chart.

Below is the TypeScript program to deploy Mattermost. This example assumes that you have a Kubernetes cluster configured and ready for deployment and that you have the helm chart information ready.

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

// Create a Kubernetes Helm Chart resource specifying the Mattermost Helm chart.
const mattermost = new k8s.helm.v3.Chart("mattermost-instance", {
    // Replace with the actual repo URL where the Mattermost chart is hosted.
    fetchOpts: {
        repo: "https://helm.mattermost.com/"
    },
    chart: "mattermost-team-edition",
    version: "6.0.0", // Specify the desired chart version.
    values: {
        // Provide any Mattermost configuration values here.
        // These values will override the defaults in the Mattermost Helm chart values.
        // For example, you might want to configure the following:
        mysql: {
            mysqlUser: "mattermost",
            mysqlDatabase: "mattermost",
            mysqlPassword: "securepassword"
        },
        ingress: {
            enabled: true,
            hosts: ["mattermost.your-domain.com"]
        },
        service: {
            type: "LoadBalancer"
        }
        // ... add more configuration based on your requirements.
    }
});

// Export the endpoint of Mattermost
export const endpoint = mattermost.getResourceProperty("v1/Service", "mattermost-instance-mattermost-team-edition", "status");
```

In the above program:

- An instance of `k8s.helm.v3.Chart` is created with the name `mattermost-instance`.
- The `fetchOpts` specify the repository where the Mattermost Helm chart can be found.
- The `chart` is set to the name of the Mattermost chart, and the `version` is specified to ensure you deploy a particular version.
- The `values` property is used to override default values from the Mattermost chart. You can configure how Mattermost connects to a database, how it's exposed to the internet through an ingress controller, and the type of service to use (in this case, a LoadBalancer).
  
This results in deploying Mattermost to your Kubernetes cluster at the specified version with your custom configurations. Finally, we are exporting an 'endpoint' resource property that will contain information about the LoadBalancer service, such as IP address or DNS name once Mattermost is deployed and the service is live.

Remember, you should replace the values with appropriate ones suitable for your deployment. You may also need to install specific CRDs or configure role-based access controls (RBAC) if the chart requires them.

Before running this code, ensure you have the Pulumi CLI installed and authenticated with your Kubernetes cluster. You can then run `pulumi up` to execute your program and deploy Mattermost. The Pulumi CLI will show you a preview of the resources that will be created, and you can confirm to proceed with the deployment.