Deploy the postgres-instance helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a PostgreSQL instance using Helm on a Kubernetes cluster with Pulumi, you would typically perform the following steps:

1. Create a new Pulumi project and set up the necessary configurations for your Kubernetes provider.
2. Utilize the `Chart` resource from the Pulumi Kubernetes provider to deploy a Helm chart.

In this program, we will:

- Define a `Chart` resource specifying the `postgres-instance` Helm chart.
- Provide the necessary configurations for the PostgreSQL instance through the `values` property.
- Deploy this chart to a pre-configured Kubernetes cluster.

Below is a Pulumi TypeScript program that demonstrates how to deploy the `postgres-instance` Helm chart:

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

// Define the PostgreSQL Helm chart from a remote repository
const postgresChart = new k8s.helm.v3.Chart("postgres-instance", {
    chart: "postgresql",
    version: "10.3.11", // Specify the version of the chart you want to deploy
    fetchOpts: {
        repo: "https://charts.bitnami.com/bitnami" // This is the Bitnami Helm charts repository
    },
    // Provide values for the Helm chart's configurable options
    values: {
        global: {
            postgresql: {
                postgresqlUsername: "admin",
                postgresqlPassword: "P@ssw0rd!",
                postgresqlDatabase: "mydb"
            }
        }
    }
});

// Export the Cluster IP of the PostgreSQL service
export const postgresClusterIP = postgresChart.getResourceProperty(
    "v1/Service",
    "postgres-instance-postgresql",
    "spec"
).apply(spec => spec.clusterIP);
```

In this code:

- We import the Pulumi Kubernetes library, which allows you to interact with Kubernetes resources.
- We create a new instance of a Helm chart with `new k8s.helm.v3.Chart()`, which represents a deployable unit of the `postgresql` Helm chart.
- The `chart` parameter is the name of the chart we want to deploy, in this case, `postgresql`.
- The `version` is the specific chart version we want to use.
- `fetchOpts.repo` points to the repository where the Helm chart is hosted.
- The `values` object allows us to specify configurations for the PostgreSQL deployment, such as the username, password, and default database name.
- Lastly, we export the Cluster IP of the PostgreSQL service to be able to access the PostgreSQL instance once it's been deployed.

If you have Pulumi CLI and Kubernetes configured, you can save this code to a `index.ts` file, execute `pulumi up`, and Pulumi will perform the deployment. Ensure that you have Helm installed on your system and that your Kubernetes cluster context is correctly set in your environment.