How Do I Build an AWS Appautoscaling Policy With Pulumi?

Introduction

In this guide, we will walk through the steps to create an AWS Application Auto Scaling policy using Pulumi. AWS Application Auto Scaling allows you to configure automatic scaling for various AWS resources, ensuring that your applications can handle changes in demand efficiently.

Step-by-Step Explanation

Step 1: Set Up Pulumi and AWS

1. Ensure you have Pulumi installed. If not, follow the installation guide.
2. Configure Pulumi to use AWS as the cloud provider. You can do this by setting up your AWS credentials as described in the AWS setup guide.

Step 2: Create a New Pulumi Project

1. Create a new directory for your project and navigate into it:

   mkdir pulumi-appautoscaling
   cd pulumi-appautoscaling
   

2. Initialize a new Pulumi project:

   pulumi new aws-typescript
   

Step 3: Define the Auto Scaling Policy

1. Open the index.ts file in your project directory.
2. Define the necessary resources for your auto scaling policy. This includes creating a target resource (e.g., an ECS service) and the scaling policy itself.

Here is an example code snippet to create an auto scaling policy for an ECS service:

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

// Create an ECS cluster
const cluster = new aws.ecs.Cluster("my-cluster");

// Create an ECS task definition
const taskDefinition = new aws.ecs.TaskDefinition("my-task", {
    family: "my-task-family",
    containerDefinitions: JSON.stringify([{
        name: "my-container",
        image: "nginx",
        cpu: 256,
        memory: 512,
        essential: true,
    }]),
});

// Create an ECS service
const service = new aws.ecs.Service("my-service", {
    cluster: cluster.id,
    taskDefinition: taskDefinition.arn,
    desiredCount: 1,
});

// Create an Application Auto Scaling target
const target = new aws.appautoscaling.Target("my-target", {
    maxCapacity: 10,
    minCapacity: 1,
    resourceId: pulumi.interpolate`service/${cluster.name}/${service.name}`,
    scalableDimension: "ecs:service:DesiredCount",
    serviceNamespace: "ecs",
});

// Create a scaling policy
const policy = new aws.appautoscaling.Policy("my-policy", {
    policyType: "TargetTrackingScaling",
    resourceId: target.resourceId,
    scalableDimension: target.scalableDimension,
    serviceNamespace: target.serviceNamespace,
    targetTrackingScalingPolicyConfiguration: {
        targetValue: 50.0,
        predefinedMetricSpecification: {
            predefinedMetricType: "ECSServiceAverageCPUUtilization",
        },
        scaleInCooldown: 300,
        scaleOutCooldown: 300,
    },
});

Step 4: Deploy the Stack

1. Run pulumi up to preview and deploy the changes.
2. Confirm the deployment by typing yes when prompted.

Summary

In this guide, we demonstrated how to create an AWS Application Auto Scaling policy using Pulumi. We covered setting up Pulumi with AWS, defining the necessary resources, and deploying the stack. By following these steps, you can ensure your applications scale automatically to meet demand efficiently.

Full Code Example

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

// Create an ECS cluster
const cluster = new aws.ecs.Cluster("my-cluster");

// Create an ECS task definition
const taskDefinition = new aws.ecs.TaskDefinition("my-task", {
    family: "my-task-family",
    containerDefinitions: JSON.stringify([{
        name: "my-container",
        image: "nginx",
        cpu: 256,
        memory: 512,
        essential: true,
    }]),
});

// Create an ECS service
const service = new aws.ecs.Service("my-service", {
    cluster: cluster.id,
    taskDefinition: taskDefinition.arn,
    desiredCount: 1,
});

// Create an Application Auto Scaling target
const target = new aws.appautoscaling.Target("my-target", {
    maxCapacity: 10,
    minCapacity: 1,
    resourceId: pulumi.interpolate\`service/\${cluster.name}/\${service.name}\`,
    scalableDimension: "ecs:service:DesiredCount",
    serviceNamespace: "ecs",
});

// Create a scaling policy
const policy = new aws.appautoscaling.Policy("my-policy", {
    policyType: "TargetTrackingScaling",
    resourceId: target.resourceId,
    scalableDimension: target.scalableDimension,
    serviceNamespace: target.serviceNamespace,
    targetTrackingScalingPolicyConfiguration: {
        targetValue: 50.0,
        predefinedMetricSpecification: {
            predefinedMetricType: "ECSServiceAverageCPUUtilization",
        },
        scaleInCooldown: 300,
        scaleOutCooldown: 300,
    },
});