Deploy the mongodb-replicaset helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the `mongodb-replicaset` Helm chart on OpenShift using Pulumi, you'll need to use the Pulumi Kubernetes provider. The provider allows you to interact with Kubernetes clusters and deploy resources such as Helm charts.

Below is a Pulumi program in TypeScript that demonstrates how to deploy a Helm chart for a MongoDB ReplicaSet on OpenShift. This example assumes that you have an existing OpenShift cluster and that you've already configured your Pulumi environment to communicate with that cluster (e.g., via `kubeconfig`).

First, we’ll import the necessary packages for deploying Helm charts with Pulumi. We'll then create a new Pulumi Kubernetes chart resource which represents the MongoDB ReplicaSet Helm chart.

Please pay attention to the inline comments within the code; they explain what each section is doing.

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

// Define the name of the namespace you want to deploy the Helm chart in.
// By default, we set this to 'default', but you can change it as required.
const namespace = 'default';

// Create an instance of the Helm chart for MongoDB ReplicaSet.
// This assumes that you have already added the relevant Helm repository
// with the MongoDB charts and named it 'bitnami' (e.g., `helm repo add bitnami https://charts.bitnami.com/bitnami`).
// If using a different repository, ensure the correct repository name and URL.
const mongodbReplicaSet = new k8s.helm.v3.Chart('mongodb-replicaset', {
    chart: 'mongodb-replicaset',
    version: '3.9.10', // specify the version of the chart to deploy
    namespace: namespace,
    fetchOpts: {
        repo: 'https://charts.bitnami.com/bitnami',
    },
    // Override values here to configure your MongoDB ReplicaSet.
    // Below is an example configuration of values you might set, 
    // but adjust them to fit your needs.
    values: {
        replicaSetName: 'rs0',
        replicas: 3,
        auth: {
            enabled: true,
            rootPassword: 'your-root-password', // replace with your own password
            // ... other auth configs
        },
        // ... additional custom configs
    }
});

// Export the MongoDB ReplicaSet Helm chart name
export const chartName = mongodbReplicaSet.name;
```

In the code above, you can customize the chart deployment by:

- Changing the `namespace` variable, if you want to deploy the Helm chart to a different namespace.
- Specifying the `version` property for the desired version of the Helm chart.
- Setting the `values` property, which allows you to configure the Helm chart to fit your needs, including enabling authentication and setting root passwords. Make sure to replace `'your-root-password'` with an actual secure password.
- Adjusting any other values according to the [chart documentation](https://artifacthub.io/packages/helm/bitnami/mongodb-replicaset) as needed.

To apply this Pulumi program, save the code to a file with a `.ts` extension, for example, `deployMongoDb.ts`. Before running the given Pulumi program, you will need to have the Pulumi CLI and Node.js installed, and you must have configured your Pulumi for Kubernetes, specifically targeted to your OpenShift cluster.

Once you've done this setup, you can run the following commands in your terminal to deploy the Helm chart:

```shell
pulumi stack init mongodb-replicaset-deployment
pulumi up
```

The first command initializes a new stack, which is an isolated environment where resources are deployed. The second command (`pulumi up`) provisions the resources as per the program. It will show you a preview of the actions that will be taken, and upon confirmation, it will apply those actions to deploy the MongoDB ReplicaSet.

Always ensure that you review the Helm chart values that you are setting and adhere to best practices regarding sensitive data, such as using Pulumi's secret management for passwords or other secrets.