Deploy the postgresql-persistent helm chart on AWS EKS

Question

Pulumi · Accepted Answer

To deploy a PostgreSQL chart on AWS EKS, you'll follow a few primary steps:

1. **Create or configure an AWS EKS cluster**: EKS, or Amazon Elastic Kubernetes Service, is a managed Kubernetes service that simplifies running Kubernetes on AWS without needing to install, operate, and maintain your own Kubernetes control plane or nodes.

2. **Deploy the PostgreSQL Helm chart on the EKS cluster**: Helm is a package manager for Kubernetes, which uses charts as packages. A Helm chart can define complex stacks with Kubernetes resources.

The following Pulumi program will guide you through the steps needed to deploy the `postgresql` Helm chart on an AWS EKS cluster. Note that for simplicity, we're assuming that you have AWS credentials configured and the necessary IAM roles and policies for EKS already set up.

Here's the TypeScript code to accomplish this:

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

// Create a VPC for our cluster.
const vpc = new awsx.ec2.Vpc("my-vpc", {
    numberOfAvailabilityZones: 2,
});

// Create an EKS cluster with the default configuration.
const cluster = new eks.Cluster("my-cluster", {
    vpcId: vpc.id,
    subnetIds: vpc.publicSubnetIds, // Assuming workloads are fine to run in the public subnet
});

// Set up a Kubernetes provider using the kubeconfig from the EKS cluster
const provider = new k8s.Provider("k8s-provider", {
    kubeconfig: cluster.kubeconfig.apply(JSON.stringify),
});

// Deploy the postgresql-persistent Helm chart on the EKS cluster
const postgresqlChart = new k8s.helm.v3.Chart("postgresql-persistent", {
    chart: "postgresql",
    version: "10.3.11", // replace with the desired chart version
    fetchOpts: { repo: "https://charts.bitnami.com/bitnami" },
    values: {
        // The values here will be specific to PostgreSQL chart and your needs.
        // Persistence settings, resource limits, passwords, etc., should be set up here.
        // Beispiel:
        persistence: {
            size: "10Gi",
            storageClass: "standard", // The storage class should exist in the EKS cluster.
        },
    },
}, { provider });

// Export the cluster's kubeconfig.
export const kubeconfig = cluster.kubeconfig;
```

### Explanation:

- **VPC Creation**: We first create a VPC suitable for our EKS cluster. We are setting up a new VPC with a set number of Availability Zones.

- **EKS Cluster**: We then create an EKS cluster within the VPC. This sets up all the necessary resources for an EKS cluster on AWS.

- **Kubernetes Provider**: We configure a Kubernetes provider using the kubeconfig from our EKS cluster. This provider enables us to deploy Kubernetes resources to the cluster.

- **Helm Chart Deployment**: Finally, we deploy the `postgresql` Helm chart by specifying the chart name and the desired version. We use `values` to provide configuration options for the PostgreSQL chart, which can include persistence settings, security configurations, resource constraints, among others.

- **Exported Value**: The `kubeconfig` file necessary to interact with the cluster is exported, allowing you to use `kubectl` or other tools to interact with your EKS cluster.

Please inspect the values and configurations to ensure they meet your requirements before deploying this to a production environment. Adjust the various properties, such as storage class or chart version, as needed.

Remember, to run this Pulumi program, you would need to:

1. Install Pulumi and set it up with your AWS account.
2. Install Node.js and the Pulumi CLI.
3. Create a new directory and initialize a new Pulumi project with `pulumi new`.
4. Replace the contents of `index.ts` with the code above.
5. Run `pulumi up` to preview and deploy the changes.