Deploy the openshift-nexus3 helm chart on Opensshift

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Pulumi · Accepted Answer

Deploying a Helm chart on an OpenShift cluster using Pulumi involves several steps. OpenShift is a Kubernetes distribution from Red Hat, so we can make use of Pulumi's Kubernetes resources to accomplish this task. Specifically, I'll be using the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes provider, which allows us to deploy Helm charts into a Kubernetes cluster.

The OpenShift Nexus3 Helm chart is a pre-packaged application that can be installed on OpenShift to provide a Nexus Repository Manager 3 instance. Helm charts define the desired state of an application's resources, which Pulumi can then apply to your cluster.

First, make sure you have access to an OpenShift cluster and that `kubectl` is configured to interact with it. Helm charts can include a lot of configurable parameters, but I'll stick to the basics in this example. If you have specific configuration values you'd like to use for your Nexus3 deployment, you could include those in the `values` argument to the `kubernetes.helm.v3.Chart` resource.

Before you can deploy, you'll need to set up the Pulumi environment:
- Install Pulumi CLI on your local machine.
- Log in to the Pulumi service (`pulumi login`).
- Create a new Pulumi project with `pulumi new`.
- Set up your OpenShift/Kubernetes credentials so that Pulumi can use them to access your cluster.

Now, here is the program in TypeScript that deploys the OpenShift Nexus3 Helm chart:

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

// Create a new instance of the openshift-nexus3 Chart
const nexusChart = new k8s.helm.v3.Chart("openshift-nexus3", {
    // Point to the repository and chart we want to install.
    // The exact location and version will depend on the chart's repository.
    repo: "nexus-repository",
    chart: "openshift-nexus3",
    // You can override default values here.
    // 'values' is where you alter the configuration provided by the Helm chart.
    // E.g., setting the service type to NodePort or passing a specific Nexus configuration.
    values: {
        // For example purposes only.
        // These are not actual configuration values for the OpenShift Nexus3 Helm chart.
        // You will need to replace these with actual values based on the chart documentation.
        service: {
            type: "NodePort",
            nodePort: 32000,
        },
    },
    // Namespace where the chart will be installed.
    namespace: "nexus",
    // (Optional) Set to true if you want Pulumi to install the Helm chart without waiting for all resources to be available.
    // It can be helpful if you are managing dependencies manually or to speed up deployments, but use with caution.
    skipAwait: false,
    // (Optional) By default, Pulumi will use the Kubernetes Credentials you've set up in your environment (or in kubeconfig).
    // If you need to specify a different context or credentials, you can do so here.
    // For example:
    // kubeconfig: "<KUBECONFIG_CONTENTS>",
});

// Export the Chart name
export const chartName = nexusChart.name;

// Export the namespace of the Chart
export const chartNamespace = nexusChart.namespace;
```

This program will create a `Chart` resource using the `openshift-nexus3` Helm chart. Replace the `repo` and `chart` details with the actual Helm chart repository information for OpenShift Nexus3. The `values` parameter is used to override or specify any configuration options that are specific to the Nexus3 chart. In a real-world scenario, consult the chart's documentation to find out what values can be customized.

The `namespace` parameter should reflect the OpenShift project or Kubernetes namespace where you want to deploy Nexus3. If you don't specify it, the chart will be installed in the default namespace. If you want Pulumi to apply the configuration and not wait for the resources to be available (ready status), you can set `skipAwait` to `true`.

After you've set up your program, run `pulumi up` to start the deployment. Pulumi will print out the planned changes, ask for confirmation, and proceed to deploy the chart to your OpenShift cluster if you confirm. Once the deployment is complete, you can use `pulumi stack output` to get any exported values, such as the deployed chart name or namespace.

Remember to refer to the Helm chart's own documentation for details on the various configuration options that can be set in the `values` object.