Deploy the redisfailover helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the `redisfailover` Helm chart on Kubernetes using Pulumi, you would typically use the `helm.v3.Chart` resource from the `@pulumi/kubernetes` package. This Pulumi resource allows you to deploy Helm charts in a declarative way.

In the program below, it is important to first have a Kubernetes cluster available and your kubeconfig set up correctly, as Pulumi will use it to communicate with your Kubernetes cluster. The `helm.v3.Chart` resource takes the chart name, and optionally, additional configuration parameters such as the `values`, which override the default values in the Helm chart, and the `namespace` to deploy the chart into.

Here's a TypeScript program that deploys the `redisfailover` Helm chart to a Kubernetes cluster:

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

// Create a Helm chart resource for Redis failover, using the stable repository.
const redisFailoverChart = new k8s.helm.v3.Chart("redis-failover", {
    chart: "redis-ha", // The chart name, make sure this corresponds to the real chart name of redis failover
    version: "4.3.1", // Specify the chart version you want to deploy
    // Optional: specify the Helm repository URL if it's not in the default repo list
    // repo: "https://...",
    // Optional: override default values
    // values: {
    //     "sentinel": {
    //         "enabled": true
    //     },
    //     "redis": {
    //         "password": "yourpassword"
    //     },
    // },
    namespace: "default", // Specify the namespace where you want the chart to be deployed
});

export const chartName = redisFailoverChart.metadata.apply(m => m.name);
```

**Explanation:**

1. **Import the Kubernetes package**: We start by importing the `@pulumi/kubernetes` package which allows us to interact with Kubernetes resources.

2. **Create Helm Chart Resource**: We instantiate a `helm.v3.Chart` resource named `redis-failover`. The `chart` property is used to specify the name of the Helm chart we want to deploy (`redis-ha`). Ensure to replace it with the actual name if it's different.

3. **Specify Chart Version**: Via the `version` property, we specify the version of the chart we want to deploy.

4. **Helm Repository**: If the `redisfailover` chart is not part of the stable repository that Helm knows about by default, we would need to specify the `repo` property with the URL where the Helm chart can be found.

5. **Override Default Values**: The `values` property can be used to provide any overrides to the default chart values. This is commented out in this code block but would be the place to specify things like custom image versions, resource constraints, or other Redis configurations.

6. **Namespace Specification**: By setting the `namespace` property, we decide where the Helm chart will be deployed within the Kubernetes cluster. Here it's set to `default`, but this can be changed to deploy to a different namespace.

7. **Export Chart Name**: Lastly, we export the name of the Helm chart resource as an output. This is not required but can be useful if you need to programmatically access the name of the deployed chart later on.

After writing this Pulumi program:

- Run `pulumi up` to preview and deploy the changes. It will show you what it's going to do before making any changes. Confirm the deployment to proceed.
- Pulumi will then execute the plan and deploy your `redisfailover` Helm chart to the targeted Kubernetes cluster.

Remember to replace any placeholder values with values specific to your use case, and if the Redis failover Helm chart you want to deploy is hosted in a custom repository, make sure to specify that repository's URL.