Deploy the python-fastapi-postgres helm chart on Rancher

Question

Pulumi · Accepted Answer

To deploy a Helm chart on Rancher using Pulumi, you will need to interact with the Rancher2 provider. This provider enables you to manage Rancher resources within your Pulumi program. As of the current state of the Pulumi provider for Rancher, it doesn't directly support deploying Helm charts. However, you can manage Rancher clusters and other resources.

To accomplish your goal with Pulumi, you'll need to ensure that your Rancher cluster is set up and accessible. Once that's done, you typically use `kubectl` to apply Helm charts to your Kubernetes cluster. In a typical workflow outside of Pulumi, you would use `helm` directly to deploy your chart after connecting to your Kubernetes cluster.

The approach with Pulumi would be to ensure that your Kubernetes cluster managed by Rancher is properly configured, and then you would use a combination of `kubectl` or `helm` command-line tools to deploy the FastAPI and PostgreSQL Helm chart.

Below is a hypothetical Pulumi TypeScript program structure that can help you start working with the Rancher2 provider. The program itself won't deploy a Helm chart as this is not directly supported, but it will set up a namespace in Rancher which you can use to organize your FastAPI deployment:

```typescript
import * as rancher2 from "@pulumi/rancher2";
import * as k8s from "@pulumi/kubernetes";

// Create a new Rancher2 namespace
const namespace = new rancher2.Namespace("fastapi-namespace", {
    name: "fastapi",
    projectId: "your-rancher-project-id", // Replace with your actual project ID
    description: "Namespace for the FastAPI application",
    // Other parameters as needed
});

// Initialize a provider for the created namespace
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: "your-kubeconfig-string", // Replace with your actual kubeconfig
});

// Using the K8s provider, you could apply raw manifests, yaml files, etc.
// Here we would place the code to apply the Helm chart using k8s.helm.v3.Chart or raw YAML manifests.

// Informational output
export const namespaceName = namespace.name;
```

In this code:
- We're importing the Rancher2 provider and the Kubernetes provider. 
- We're creating a new namespace in Rancher, which you could use to deploy your Helm chart.
- We're creating a Kubernetes provider, this is where you would need your `kubeconfig` from Rancher which allows you to interact with your Kubernetes cluster.

For deploying a Helm chart, you would typically add the following lines inside your Pulumi program:

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

// ... other code ...

const chart = new k8s.helm.v3.Chart("python-fastapi-postgres", {
    chart: "python-fastapi-postgres",
    version: "chart-version", // specify the chart version
    namespace: namespaceName,
    // Set values for the necessary customizations
    values: {
        // Chart values
    },
}, { provider: k8sProvider });

// ... other code ...
```

The actual values and chart version will depend on the specific Helm chart you're trying to deploy. You'll need to replace `"python-fastapi-postgres"` with the correct chart name and repository, and provide the necessary `values` for your FastAPI and PostgreSQL configuration.

Please note that the code above assumes you have set up Pulumi, Rancher, and Helm appropriately and have the right access credentials and permissions in place. If you are new to Pulumi, I recommend visiting the [Pulumi documentation](https://www.pulumi.com/docs/intro/) to understand the core concepts before starting with your deployments.