Deploy the mysql-is helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the `mysql` Helm chart on a Kubernetes cluster using Pulumi, we will utilize the Pulumi Kubernetes provider. The provider allows us to use Pulumi to deploy and manage Kubernetes resources, including those defined by Helm charts.

We'll begin by creating a Pulumi program in TypeScript that accomplishes the following:

1. Sets up the necessary Kubernetes provider.
2. Defines the Helm chart resource pointing to the `mysql` chart.

For the purpose of this example, we will assume that you have already set up your Kubernetes cluster and configured `kubectl` to connect to it. Additionally, we'll use the `mysql` chart from the default Helm repository (stable).

Here is the Pulumi program that deploys the `mysql` Helm chart on your Kubernetes cluster:

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

// Create a Kubernetes Provider instance that uses the current context from your kubeconfig.
const provider = new k8s.Provider("k8s", {
    // Uses the context from the kubeconfig file specified in the KUBECONFIG environment variable.
    // If KUBECONFIG is not specified, it will use the default kubeconfig path (~/.kube/config).
});

// Instantiate the MySQL Helm Chart from the Helm repository.
const mysqlChart = new k8s.helm.v3.Chart("mysql", {
    chart: "mysql",
    version: "8.8.2", // Specify the version of the chart you wish to deploy, make sure it's compatible with your cluster.
    fetchOpts: {
        repo: "https://charts.bitnami.com/bitnami", // The repository where the MySQL chart is located.
    },
}, { provider: provider });

// To access the MySQL instance, you might need the service endpoint or other information.
// You can export these details from your Pulumi program.
export const mysqlServiceName = mysqlChart.getResourceProperty("v1/Service", "mysql", "metadata").apply(m => m.name);
```

Here's a brief explanation of what each part of this code is doing:

- **Import Pulumi Kubernetes Package:** We import the `@pulumi/kubernetes` package, which includes the classes and functions we'll use to interact with Kubernetes resources.

- **Kubernetes Provider:** This is an instance of the Kubernetes provider that tells Pulumi how to communicate with a Kubernetes cluster. We configure it to use the default kubeconfig file (`~/.kube/config`) or the one specified by the `KUBECONFIG` environment variable.

- **Helm Chart Resource:** The `Chart` resource is how Pulumi deploys Helm charts. In our example, we create a new chart resource for `mysql`, specifying the chart name, version, and repository. Note that you should specify a version compatible with your Kubernetes cluster. You can find available versions on the [artifacthub.io](https://artifacthub.io/).

- **Exported Outputs:** Pulumi allows exporting resources' information that may be useful elsewhere. In this case, we export the service name of the MySQL deployment to potentially use it outside of Pulumi, like constructing a connection string in an application.

You would run this program using the Pulumi CLI by executing `pulumi up`, which will perform the deployment. Make sure that your Pulumi CLI is correctly installed and configured to connect to your Kubernetes cluster. If the deployment is successful, Pulumi will print out the exported values, like the MySQL service name, at the end of the run. This information can be used to interact with the MySQL database deployed in your cluster.