Deploy the krakend helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the `krakend` Helm chart on a Kubernetes cluster using Pulumi, we need to follow these steps:

1. Ensure that you have a Kubernetes cluster up and running. You can either provision a new Kubernetes cluster using cloud provider-specific Pulumi resources or use an existing one.

2. Set up the Pulumi Kubernetes provider to interact with your Kubernetes cluster.

3. Use the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes provider to deploy the `krakend` Helm chart.

Below is a detailed TypeScript program that demonstrates how to deploy the `krakend` Helm chart on Kubernetes using Pulumi:

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

// Create a Kubernetes provider instance. The provider uses the default kubeconfig
// credentials in your local environment. You can also explicitly pass a kubeconfig file.
const provider = new k8s.Provider('k8s-provider', {});

// Deploy the krakend Helm chart using the kubernetes.helm.v3.Chart resource.
// You can specify chart values by setting the `values` field. This example assumes
// you are using the default values of the chart.

// Define the chart name and repository URL.
const chartName = 'krakend';
const chartRepo = 'https://helm.devopsfaith.com/';

// Instantiate the Helm chart for Krakend.
const krakendChart = new k8s.helm.v3.Chart('krakend-chart', {
    chart: chartName,
    fetchOpts: { repo: chartRepo },
    version: '1.0.0', // Replace with the desired chart version.
    // Define any custom values for the Helm chart here. For example:
    // values: {
    //     service: {
    //         type: 'LoadBalancer',
    //     },
    // },
}, { provider }); // Associate the helm chart with the k8s provider.

export const chartNameOutput = krakendChart.chart;
export const chartVersionOutput = krakendChart.version;

```

This program does the following:

- It starts by importing the required Pulumi package to interact with Kubernetes.
  
- Sets up a Kubernetes provider resource, which is an abstraction used by Pulumi to handle communication with your Kubernetes cluster. Here, it simply uses the default kubeconfig settings.

- Then, it uses the `kubernetes.helm.v3.Chart` class to deploy the `krakend` Helm chart from the specified repository. In this case, `version` is set to `1.0.0`, but you should replace this with the actual chart version you intend to deploy.

- Optionally, you can pass a values object to the `values` property to customize the Helm chart values. This is where you would set configuration options for `krakend`, such as service type, ports, etc.

- Finally, it exports two stack outputs: the name of the Helm chart and the version that has been deployed. This can be helpful for reference or integration with other parts of your infrastructure.

When you run this Pulumi program, it will deploy the `krakend` Helm chart onto your Kubernetes cluster using the settings provided. If you need to customize the deployment, you can modify the `values` object with the specific configuration needed for `krakend`. For more detailed information about Helm charts and configuration, refer to the official Helm Chart documentation and `krakend` Helm chart configuration options.

Remember to replace the `version` placeholder with the actual chart version you want to deploy, and if the chart requires it, specify a namespace or any other mandatory parameters.

To apply the Pulumi program, save it to a file `index.ts`, and run the following commands:

```sh
pulumi up
```

This command will preview the changes and then prompt you to apply them to your Kubernetes cluster. If everything looks correct, you can confirm, and Pulumi will carry out the deployment.