Deploy the thanos-mixin helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the `thanos-mixin` Helm chart on a Kubernetes cluster using Pulumi, you can leverage the `kubernetes.helm.v3.Chart` resource. This resource allows you to deploy Helm charts in a declarative way.

Here's what you need to accomplish this:

1. **Chart Resource**: You'll define a Helm Chart resource to represent the `thanos-mixin` chart. You need to provide the name of the chart and optionally specify a specific version and values that configure the chart.

2. **Kubernetes Provider**: Pulumi needs to be connected to your Kubernetes cluster. Typically, if you've already logged into your cluster using a tool like `kubectl`, Pulumi will use the same kubeconfig file to communicate with the cluster.

Below is a program written in TypeScript which you can use as a base to deploy the `thanos-mixin` Helm chart:

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

// Define the Thanos Mixin Helm chart.
const thanosMixinChart = new kubernetes.helm.v3.Chart('thanos-mixin', {
    chart: 'thanos-mixin',
    // You might specify the repository here if it's a custom Helm chart repository.
    // For example, if you need to add a repository:
    // repo: 'https://kubernetes-charts.storage.googleapis.com/',
    // version: 'x.y.z', // Optionally, specify a chart version here.
    namespace: 'thanos', // Specify the namespace where you want this chart to be deployed.

// If the chart requires custom values, you can add them here:
    values: {
        // Your custom values for the 'thanos-mixin' chart go here.
        // eg:
        // persistence: {
        //   enabled: true,
        //   size: "10Gi",
        // },
    },
    
    // If necessary, you can customize the resource names using transformations.
    transformations: [
        (obj: any) => {
            obj.metadata.namespace = 'thanos'; // Ensuring that all resources are deployed in the 'thanos' namespace.
        },
    ],
});

// Export the URL to access the dashboard if applicable.
export const thanosUrl = thanosMixinChart.getResourceProperty('v1/Service', 'thanos-mixin', 'status').apply(status => {
    if (status.loadBalancer.ingress) {
        // Depending on your service type and cluster setup, you might get an IP or a hostname here.
        let ingress = status.loadBalancer.ingress[0];
        return ingress.ip ? ingress.ip : ingress.hostname;
    }
    return 'The service is not externally reachable yet';
});
```

### Explanation:

- We import the `@pulumi/kubernetes` package which is the Pulumi provider for Kubernetes resources.
  
- We create a new Helm chart resource named `thanos-mixin` with the `kubernetes.helm.v3.Chart` class.
  
- The `chart` parameter is the name of the chart we want to deploy.
  
- The `repo` parameter is where you would place the URL of the custom chart repository. If `thanos-mixin` is available in the default repository that Pulumi knows, this can be omitted.

- The `version` parameter is optionally used if you want to pin the deployment to a specific chart version.
  
- The `namespace` parameter specifies which namespace in the cluster you would like this chart to be deployed. Make sure this namespace already exists in your cluster or add `createNamespace: true` to let Pulumi create it as part of the deployment.

- The `values` parameter is optional. This is a place to provide any custom configuration that your chart accepts. These values will overwrite the defaults provided by the Helm chart.

- The `transformations` parameter is a list of functions that modify the default resource manifests in some way before they are applied to the cluster. In this case, just as an example, we make sure that all resources will be deployed in the `thanos` namespace.

- Finally, we're exporting the URL where you might access your Thanos service. However, this is highly dependent on how the Helm chart is set up and how services are exposed in your environment.
  
Remember to replace placeholders in the `values` object with the actual configuration parameters specific to `thanos-mixin` Helm chart and your requirements.

### Using This Program:

To use this program, you will need to have Pulumi installed and configured for access to your Kubernetes cluster. You can write this TypeScript code into a file, for example, `index.ts`, set up your Pulumi project, install the necessary dependencies with npm (`@pulumi/kubernetes`), and then run `pulumi up` to execute it. Pulumi will provision the Kubernetes resources as defined by the Helm chart, and your `thanos-mixin` deployment should be live shortly afterward.