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@sebsto sebsto/code-stack.ts
Last active Sep 24, 2019

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CDK Create EC2 instace in private subnet. Install Nginx.
import ec2 = require('@aws-cdk/aws-ec2');
import cdk = require('@aws-cdk/core');
import { Fn, Tag, Resource } from '@aws-cdk/core';
import { AmazonLinuxImage, UserData, InstanceType } from '@aws-cdk/aws-ec2';
import { Role, ServicePrincipal, ManagedPolicy, CfnInstanceProfile } from '@aws-cdk/aws-iam'
/**
* Create my own Ec2 resource and Ec2 props as these are not yet defined in CDK
* These classes abstract low level details from CloudFormation
*/
class Ec2InstanceProps {
readonly image : ec2.IMachineImage;
readonly instanceType : ec2.InstanceType;
readonly userData : UserData;
readonly subnet : ec2.ISubnet;
readonly role : Role;
}
class Ec2 extends Resource {
constructor(scope: cdk.Construct, id: string, props? : Ec2InstanceProps) {
super(scope, id);
if (props) {
//create a profile to attch the role to the instance
const profile = new CfnInstanceProfile(this, `${id}Profile`, {
roles: [ props.role.roleName ]
});
// create the instance
const instance = new ec2.CfnInstance(this, id, {
imageId: props.image.getImage(this).imageId,
instanceType: props.instanceType.toString(),
networkInterfaces: [
{
deviceIndex: "0",
subnetId: props.subnet.subnetId
}
]
,userData: Fn.base64(props.userData.render())
,iamInstanceProfile: profile.ref
});
// tag the instance
Tag.add(instance, 'Name', `${CodeStack.name}/${id}`);
}
}
}
export class CodeStack extends cdk.Stack {
constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
super(scope, id, props);
// create VPC w/ public and private subnets in 1 AZ
// this also creates a NAT Gateway
// I am using 1 AZ because it's a demo. In real life always use >=2
const vpc = new ec2.Vpc(this, 'NewsBlogVPC', {
maxAzs : 1
});
const privateSubnet0 = vpc.privateSubnets[0];
// define the IAM role that will allow the EC2 instance to communicate with SSM
const role = new Role(this, 'NewsBlogRole', {
assumedBy: new ServicePrincipal('ec2.amazonaws.com')
});
// arn:aws:iam::aws:policy/AmazonSSMManagedInstanceCore
role.addManagedPolicy(ManagedPolicy.fromAwsManagedPolicyName('AmazonSSMManagedInstanceCore'));
// define a user data script to install & launch our web server
const ssmaUserData = UserData.forLinux();
// make sure the latest SSM Agent is installed.
const SSM_AGENT_RPM='https://s3.amazonaws.com/ec2-downloads-windows/SSMAgent/latest/linux_amd64/amazon-ssm-agent.rpm';
ssmaUserData.addCommands(`sudo yum install -y ${SSM_AGENT_RPM}`, 'restart amazon-ssm-agent');
// install and start Nginx
ssmaUserData.addCommands('yum install -y nginx', 'chkconfig nginx on', 'service nginx start');
// launch an EC2 instance in the private subnet
const instance = new Ec2(this, 'NewsBlogInstance', {
image: new AmazonLinuxImage(),
instanceType : ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE3, ec2.InstanceSize.MICRO),
subnet : privateSubnet0,
role: role,
userData : ssmaUserData
})
}
}
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