Deploy the gnocchi helm chart on Opensshift

Question

Pulumi · Accepted Answer

Deploying a Helm chart on an OpenShift cluster involves a series of steps that include setting up the OpenShift cluster, configuring the necessary permissions, and then using Helm to deploy the chart. Pulumi provides resources to manage Kubernetes resources, including Helm charts.

To accomplish this, we will be using Pulumi's `kubernetes.helm.sh/v3.Chart` resource, which allows you to deploy a Helm chart into a Kubernetes cluster. For OpenShift, we need to ensure that our Kubernetes provider is configured to point to the OpenShift cluster.

Below you will find a Pulumi program written in TypeScript that demonstrates how to deploy the `gnocchi` Helm chart on an OpenShift cluster. This example assumes you already have an OpenShift cluster running and you are authenticated with it through `kubectl`:

1. **Configure Kubernetes Provider for OpenShift**: First, we need to ensure that Pulumi is using the Kubernetes provider configured for the OpenShift cluster. This can be achieved by using the configuration from the `kubectl` command which is typically used to interact with your OpenShift cluster.

2. **Deploying the Helm Chart**: With the provider set up, we can create an instance of `kubernetes.helm.sh/v3.Chart` and specify the `gnocchi` Helm chart along with its settings.

Let's proceed with the program:

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

// Step 1: Configure the Kubernetes provider to connect to your OpenShift cluster
const openshiftK8sProvider = new k8s.Provider('openshift-k8s-provider', {
    // This utilizes the default kubeconfig file location to authenticate with OpenShift.
    // Make sure you have the correct context set for the target OpenShift cluster.
    kubeconfig: process.env.KUBECONFIG,
});

// Step 2: Deploy the gnocchi Helm chart to OpenShift
const gnocchiChart = new k8s.helm.sh.v3.Chart('gnocchi', {
    chart: 'gnocchi',
    // Specify the chart version you wish to deploy
    version: 'YOUR_CHART_VERSION',
    // The repository containing the gnocchi chart, if it isn't in the Helm stable repository
    fetchOpts: {
        repo: 'https://example.com/gnocchi-helm-charts',
    },
    // Any specific values you want to override in the values.yaml file for the Helm chart
    values: {
        // Example value override, replace with actual values specific to the gnocchi Helm chart
        storage: {
            size: '20Gi',
        },
        // ...other value overrides
    },
    // Namespace where to install the chart
    namespace: 'gnocchi-namespace',
}, { provider: openshiftK8sProvider });

// Export the base URL for the Gnocchi application, if applicable or available
export const gnocchiUrl = gnocchiChart.getResourceProperty('v1/Service', 'gnocchi', 'status').apply(status => {
    if (status?.loadBalancer?.ingress) {
        // Assuming a LoadBalancer service type, which might not be the case. Adjust accordingly.
        return status.loadBalancer.ingress[0].ip || status.loadBalancer.ingress[0].hostname;
    }
});

```

In this program:

- We create a Kubernetes provider configured to interact with the OpenShift cluster using the kubeconfig, which is expected to be available in the `KUBECONFIG` environment variable. This configuration can be found on your local machine, typically under `~/.kube/config` after you have logged in to OpenShift through the `oc` command-line tool or `kubectl`.

- We create a new Helm chart resource specifying the chart name as `gnocchi`, the Helm chart version, and any custom values you might want to provide. The `fetchOpts` object indicates the repository of the Helm chart. If the `gnocchi` Helm chart resides in a custom Helm repository, specify its URL in the `repo` property. Otherwise, you can omit this if the chart is in one of the default repositories known to Helm.

- Replace `'YOUR_CHART_VERSION'` with the actual chart version you want to deploy.

- The `values` object is a placeholder for you to specify any custom configuration that is specific to the `gnocchi` Helm chart you are deploying. This provides a means to override default settings within the chart's `values.yaml`.

- The `namespace` specifies the Kubernetes namespace in which the Helm chart will be deployed. We're deploying it to the `gnocchi-namespace`, but this can be adjusted to your preference or organizational standards.

- We're exporting the `gnocchiUrl`, which attempts to extract the external IP or hostname of the deployed Gnocchi service if it is exposed through a LoadBalancer. If you are using a different service type (like NodePort or ClusterIP), you may need to adjust this accordingly.

Please replace placeholders like `YOUR_CHART_VERSION` and the repository URL with actual values according to your needs. If required, also adjust the exported URL based on your service exposure strategy.

Finally, execute the pulumi program using `pulumi up` after saving it to a `index.ts` file, ensuring that you have installed the necessary NPM packages (`@pulumi/kubernetes`).

Remember, handling Helm charts might involve more configurations based on dependencies and complexities within the chart. Always refer to the specific Helm chart documentation for Gnocchi to understand which configurations are necessary and how they should be set.