How Do I Use Nomad With AWS Fargate?

Introduction

In this guide, we will demonstrate how to use HashiCorp Nomad with AWS Fargate using Pulumi in TypeScript. Nomad is a flexible, enterprise-grade cluster manager and scheduler that can handle a diverse range of workloads. AWS Fargate is a serverless compute engine for containers that works with both Amazon Elastic Container Service (ECS) and Amazon Elastic Kubernetes Service (EKS). By combining Nomad with AWS Fargate, you can run containerized applications without having to manage the underlying infrastructure.

Step-by-Step Explanation

Step 1: Set Up Pulumi Project

First, we need to set up a new Pulumi project. Initialize a new Pulumi project in TypeScript by running the following commands:

mkdir pulumi-nomad-fargate
cd pulumi-nomad-fargate
pulumi new typescript

Step 2: Install Required Packages

Next, install the necessary Pulumi packages for AWS and Nomad:

npm install @pulumi/aws @pulumi/nomad

Step 3: Configure AWS Provider

Configure the AWS provider in your Pulumi program. This will allow Pulumi to interact with your AWS account:

import * as aws from "@pulumi/aws";

const awsConfig = new aws.Provider("aws", {
    region: "us-west-2",
});

Step 4: Create an ECS Cluster

Create an ECS cluster that will be used by AWS Fargate:

const cluster = new aws.ecs.Cluster("nomad-cluster", {}, { provider: awsConfig });

Step 5: Create a Fargate Task Definition

Define a Fargate task that will run the Nomad agent:

const taskDefinition = new aws.ecs.TaskDefinition("nomad-task", {
    family: "nomad-task",
    networkMode: "awsvpc",
    requiresCompatibilities: ["FARGATE"],
    cpu: "256",
    memory: "512",
    containerDefinitions: JSON.stringify([{
        name: "nomad",
        image: "hashicorp/nomad:latest",
        essential: true,
        portMappings: [{
            containerPort: 4646,
            hostPort: 4646,
            protocol: "tcp"
        }]
    }]),
}, { provider: awsConfig });

Step 6: Create a Fargate Service

Create a Fargate service to run the Nomad task:

const service = new aws.ecs.Service("nomad-service", {
    cluster: cluster.arn,
    taskDefinition: taskDefinition.arn,
    desiredCount: 1,
    launchType: "FARGATE",
    networkConfiguration: {
        subnets: ["subnet-12345678"],
        assignPublicIp: true,
    },
}, { provider: awsConfig });

Key Points

• Nomad: A flexible, enterprise-grade cluster manager and scheduler.
• AWS Fargate: A serverless compute engine for containers.
• Pulumi: An infrastructure as code tool that allows you to define cloud resources using programming languages.
• ECS Cluster: A logical grouping of tasks or services.
• Fargate Task Definition: Defines how the Nomad agent container should be run.
• Fargate Service: Manages the running instances of the task definition.

Conclusion

By following this guide, you have successfully set up HashiCorp Nomad with AWS Fargate using Pulumi in TypeScript. This setup allows you to run containerized applications without managing the underlying infrastructure, leveraging the power of both Nomad and Fargate. Pulumi makes it easy to define and manage your cloud resources using familiar programming languages.

Full Code Example

import * as aws from "@pulumi/aws";

const awsConfig = new aws.Provider("aws", {
    region: "us-west-2",
});

const cluster = new aws.ecs.Cluster("nomad-cluster", {}, { provider: awsConfig });

const taskDefinition = new aws.ecs.TaskDefinition("nomad-task", {
    family: "nomad-task",
    networkMode: "awsvpc",
    requiresCompatibilities: ["FARGATE"],
    cpu: "256",
    memory: "512",
    containerDefinitions: JSON.stringify([{
        name: "nomad",
        image: "hashicorp/nomad:latest",
        essential: true,
        portMappings: [{
            containerPort: 4646,
            hostPort: 4646,
            protocol: "tcp"
        }]
    }]),
}, { provider: awsConfig });

const service = new aws.ecs.Service("nomad-service", {
    cluster: cluster.arn,
    taskDefinition: taskDefinition.arn,
    desiredCount: 1,
    launchType: "FARGATE",
    networkConfiguration: {
        subnets: ["subnet-12345678"],
        assignPublicIp: true,
    },
}, { provider: awsConfig });