How do I use AWS EC2 with API Gateway?
To create an AWS EC2 instance and expose it through an API Gateway using Pulumi, you will need to follow these steps:
- Create an EC2 instance: This instance will host your application or service.
- Create an API Gateway: This will provide a RESTful API interface to your EC2 instance.
- Integrate API Gateway with the EC2 instance: This involves creating an API Gateway resource and method, and then linking it to the EC2 instance.
Here’s a detailed explanation followed by a Pulumi program written in TypeScript to achieve this:
Explanation
EC2 Instance:
- We will create a security group to allow HTTP traffic.
- We will launch an EC2 instance using a specified AMI and instance type.
API Gateway:
- We will create a REST API.
- We will create a resource and method for the API.
- We will create an integration to link the API method to the EC2 instance.
- We will deploy the API.
Pulumi Program
import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";
// Create an EC2 security group to allow HTTP traffic
const ec2SecurityGroup = new aws.ec2.SecurityGroup("web-secgrp", {
ingress: [
{ protocol: "tcp", fromPort: 80, toPort: 80, cidrBlocks: ["0.0.0.0/0"] },
],
});
// Launch an EC2 instance
const ec2Instance = new aws.ec2.Instance("web-server", {
instanceType: "t2.micro",
ami: "ami-0c55b159cbfafe1f0", // Amazon Linux 2 AMI
securityGroups: [ec2SecurityGroup.name],
userData: `#!/bin/bash
echo "Hello, World" > index.html
nohup python -m SimpleHTTPServer 80 &`,
});
// Create an API Gateway REST API
const api = new aws.apigateway.RestApi("myapi", {
description: "API for my web server",
});
// Create a resource in the API
const resource = new aws.apigateway.Resource("myresource", {
restApi: api.id,
parentId: api.rootResourceId,
pathPart: "{proxy+}",
});
// Create a method for the resource
const method = new aws.apigateway.Method("mymethod", {
restApi: api.id,
resourceId: resource.id,
httpMethod: "ANY",
authorization: "NONE",
});
// Create an integration to link the API method to the EC2 instance
const integration = new aws.apigateway.Integration("myintegration", {
restApi: api.id,
resourceId: resource.id,
httpMethod: method.httpMethod,
type: "HTTP_PROXY",
uri: pulumi.interpolate`http://${ec2Instance.publicDns}`,
integrationHttpMethod: "ANY",
});
// Deploy the API
const deployment = new aws.apigateway.Deployment("mydeployment", {
restApi: api.id,
stageName: "prod",
}, { dependsOn: [method] });
// Export the URL of the API
export const apiUrl = deployment.invokeUrl;
Explanation of the Code
- Security Group: We create a security group
web-secgrp
to allow incoming HTTP traffic on port 80. - EC2 Instance: We launch an EC2 instance
web-server
using the Amazon Linux 2 AMI. The instance runs a simple HTTP server that serves “Hello, World”. - API Gateway:
- We create a REST API
myapi
. - We create a resource
myresource
with a path parameter{proxy+}
to act as a catch-all for all paths. - We create a method
mymethod
for the resource, allowing any HTTP method (ANY
) and no authorization. - We create an integration
myintegration
that links the method to the EC2 instance using the instance’s public DNS.
- We create a REST API
- Deployment: We deploy the API to a stage named
prod
. - Export: We export the URL of the deployed API.
This program sets up an EC2 instance and exposes it via an API Gateway, allowing you to access the EC2 instance through the API Gateway URL.
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