Deploy the mongo-sed helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the `mongo-sed` Helm chart on an OpenShift cluster using Pulumi, we'll use the `@pulumi/kubernetes` package to interact with the Kubernetes API within OpenShift. Pulumi allows you to write code in TypeScript to define and manage infrastructure as code, and we'll leverage the `Chart` resource from the Helm API to deploy a chart.

Before you proceed, ensure you have the following prerequisites in place:

1. Pulumi CLI installed and configured.
2. Access to an OpenShift cluster with `kubectl` configured to communicate with it.
3. `@pulumi/kubernetes` package installed in your project.

Here's a step-by-step guide with a Pulumi TypeScript program that deploys the `mongo-sed` Helm chart to your OpenShift cluster:

1. **Import necessary libraries** - We import the Pulumi Kubernetes library which is required to create Kubernetes resources.
2. **Create a Kubernetes provider** - If your `kubectl` is already configured to communicate with your OpenShift cluster, Pulumi will use that configuration by default. Otherwise, you'll need to explicitly create a provider with the `kubeconfig` of your OpenShift cluster.
3. **Deploy the Helm chart** - We use the `Chart` resource to deploy the `mongo-sed` Helm chart. You will need to replace `REPO_URL` with the URL of the Helm repository that contains the `mongo-sed` chart and specify any custom `values` required for your MongoDB setup.

Here's the Pulumi program in TypeScript:

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

// Deploy the mongo-sed Helm chart on an OpenShift cluster.

// Create an instance of the Chart resource to deploy the mongo-sed Helm chart.
// This assumes that you have a Helm chart available for mongo-sed in a repository.
const mongoSedChart = new k8s.helm.v3.Chart("mongo-sed", {
    chart: "mongo-sed",
    // Add the actual Helm repo URL here
    fetchOpts: { 
        repo: "REPO_URL",
    },
    // Define values for the Helm chart, as needed.
    values: {
        // Add any values you want to override here,
        // for example, you might want to set a custom admin user and password:
        // adminUser: "your-admin-username",
        // adminPassword: "your-safe-password",
    },
    // Specify the namespace if needed, the default is "default".
    // namespace: "your-namespace",
});

// Export the base URL to access the MongoDB instance.
// This assumes that the Helm chart creates a service that we can access.
// You might need to check the actual details from your Helm chart documentation.
export const mongoBaseUrl = mongoSedChart.getResourceProperty("v1/Service", "mongo-sed", "status").apply(status => status.loadBalancer.ingress[0].hostname || status.loadBalancer.ingress[0].ip);
```

The above program will deploy the `mongo-sed` Helm chart to your OpenShift cluster when executed using Pulumi.

To run this Pulumi program:

1. Save the code in a file called `index.ts`.
2. Run `pulumi up` in the command-line interface from the same directory as your `index.ts` file.
3. Pulumi will perform a preview and prompt you for confirmation before making changes to your OpenShift cluster.

Make sure to replace `REPO_URL` with the actual repository URL for the Helm chart, and fill in any necessary values that need to be configured for the MongoDB setup. If additional configuration is required (like providing a custom `kubeconfig` for a non-default OpenShift cluster), more settings can be added to the program.

Remember, before running `pulumi up`, you must run `npm install` or `yarn install` to install the necessary dependencies, including `@pulumi/kubernetes`.