Deploy the deploy-flask helm chart on AWS EKS

Question

Pulumi · Accepted Answer

To deploy a Flask application using a Helm chart on Amazon EKS with Pulumi, we need to perform several steps:

1. **Set up the EKS cluster**: Create an Amazon EKS cluster where the Flask application will be deployed.
2. **Install the Helm chart**: Deploy the Flask application represented by a Helm chart onto the EKS cluster.

Below is a Pulumi TypeScript program that accomplishes these tasks:

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

// Create an EKS cluster with the required configurations
const clusterName = "flask-cluster";

const vpc = new aws.ec2.Vpc("vpc", {
    cidrBlock: "10.100.0.0/16",
});

const subnet1 = new aws.ec2.Subnet("subnet-1", {
    vpcId: vpc.id,
    cidrBlock: "10.100.1.0/24",
});

const subnet2 = new aws.ec2.Subnet("subnet-2", {
    vpcId: vpc.id,
    cidrBlock: "10.100.2.0/24",
});

const cluster = new eks.Cluster(clusterName, {
    vpcId: vpc.id,
    subnetIds: [subnet1.id, subnet2.id],
    instanceType: "t2.medium",
    desiredCapacity: 2,
    minSize: 1,
    maxSize: 3,
});

// Deploy Helm chart for Flask application
const helmChart = new k8s.helm.v3.Chart(
    "flask-chart",
    {
        chart: "deploy-flask",
        version: "1.0.0", // Replace with actual chart version
        fetchOpts: { repo: "http://your-helm-chart-repo/" }, // Replace with actual Helm chart repo URL
    },
    { provider: cluster.provider }
);

// Export the cluster name and kubeconfig
export const kubeconfig = cluster.kubeconfig;
export const eksClusterName = clusterName;
```

### Explanation

- **Importing dependencies**: We begin by importing necessary modules from Pulumi's AWS, EKS, and Kubernetes libraries.
- **Configuring the VPC and Subnets**: We create a new VPC and a set of subnets for the EKS cluster to reside in. Properly configuring networking is vital for the cluster to communicate with other AWS resources.
- **Creating an EKS Cluster**: The 'eks.Cluster' resource creates a new Amazon EKS cluster with the specified configurations, including VPC and subnets. The instance type and capacity are also specified here.
- **Helm Chart Deployment**: Using the `k8s.helm.v3.Chart` resource, we specify the Flask application's Helm chart to be deployed on the EKS cluster. You'd need to specify the exact name of the chart `deploy-flask`, the chart version, and the chart repository where Pulumi can fetch the chart from.
- **Exporting Outputs**: Lastly, we export the `kubeconfig` and the cluster's name. The kubeconfig is needed to interact with the Kubernetes cluster.

To apply this program:

1. Save the code in a file named `index.ts`.
2. Ensure you have Pulumi and AWS CLI installed, and you're logged in to your AWS account with `aws configure`.
3. Run `pulumi up` from your command line within the directory where `index.ts` is located.

Pulumi will print out a summary of the AWS resources that will be created and request your confirmation before proceeding. After the deployment, the final output will include the Kubernetes Config and the deployed EKS Cluster name.

To find a suitable `deploy-flask` Helm chart or its repository, you typically look at Helm repositories or catalogs like [Artifact Hub](https://artifacthub.io/). You need the correct chart name, version, and repository to replace placeholders in the code above.

Please replace `http://your-helm-chart-repo/` with the actual Helm chart repository where the `deploy-flask` chart is hosted. If a repository is not provided, Helm will use its default repository, but in most cases, you will need to specify one.