Deploying A Fargate Cluster With LocalStack And The AWS CDK
Published: Aug 11, 2021
Last updated: Aug 11, 2021
This post will demonstrate how we can deploy a demo Fargate cluster to LocalStack using ECS patterns defined in the AWS CDK.
Source code can be found here
Prerequisites
- Basic familiarity with AWS CDK for TypeScript.
Getting started
We will clone the template repo to get started:
$ git clone https://github.com/okeeffed/using-the-aws-cdk-with-localstack-and-aws-cdk-local deploying-a-fargate-cluster-with-localstack-and-the-aws-cdk $ cd deploying-a-fargate-cluster-with-localstack-and-the-aws-cdk $ npm i # if install fails, remove the lockfile and try again
At this stage, we will have the app in a basic working state.
In order to create the CDN stack, we will require the following AWS CDK libraries:
@aws-cdk/core @aws-cdk/aws-ec2 @aws-cdk/aws-ecs @aws-cdk/aws-ecs-patterns
We can install these prior to doing any work:
npm i @aws-cdk/core @aws-cdk/aws-ec2 @aws-cdk/aws-ecs @aws-cdk/aws-ecs-patterns
The repository that we cloned already has a upgrade script supplied. We can use this to ensure our CDK packages are at parity:
npm run upgrade
We are now at a stage add a pattern construct to a stack.
Create a Fargate cluster
Update lib/aws-cdk-with-typescript-foundations-stack.ts to the following:
import * as cdk from "@aws-cdk/core"; import * as ec2 from "@aws-cdk/aws-ec2"; import * as ecs from "@aws-cdk/aws-ecs"; import * as ecs_patterns from "@aws-cdk/aws-ecs-patterns"; export class AwsCdkWithTypescriptFoundationsStack extends cdk.Stack { constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) { super(scope, id, props); // The code that defines your stack goes here const vpc = new ec2.Vpc(this, "MyVpc"); const cluster = new ecs.Cluster(this, "MyCluster", { vpc: vpc, }); // Create a load-balanced Fargate service and make it public new ecs_patterns.ApplicationLoadBalancedFargateService( this, "MyFargateService", { cluster: cluster, // Required cpu: 256, // Default is 256 desiredCount: 1, // Default is 1 taskImageOptions: { image: ecs.ContainerImage.fromRegistry("amazon/amazon-ecs-sample"), }, memoryLimitMiB: 512, // Default is 512 publicLoadBalancer: true, // Default is false } ); } }
At this stage, we are ready to deploy to LocalStack.
Deploying to LocalStack
The docker-compose.yml file already has what is required for us to startup LocalStack.
Run docker compose up for LocalStack to start on Docker.
Once that is started, we can go through our usual lifecycle of the AWS CDK by synthesizing and deploying our app.
$ npm run local synth # ... output omitted
We can then deploy our stack:
$ npm run local deploy > aws-cdk-with-typescript-foundations@0.1.0 local > cdklocal "deploy" This deployment will make potentially sensitive changes according to your current security approval level (--require-approval broadening). Please confirm you intend to make the following modifications: IAM Statement Changes ┌───┬───────────────┬────────┬───────────────┬───────────────┬───────────┐ │ │ Resource │ Effect │ Action │ Principal │ Condition │ ├───┼───────────────┼────────┼───────────────┼───────────────┼───────────┤ │ + │ ${MyFargateSe │ Allow │ sts:AssumeRol │ Service:ecs-t │ │ │ │ rvice/TaskDef │ │ e │ asks.amazonaw │ │ │ │ /ExecutionRol │ │ │ s.com │ │ │ │ e.Arn} │ │ │ │ │ ├───┼───────────────┼────────┼───────────────┼───────────────┼───────────┤ │ + │ ${MyFargateSe │ Allow │ sts:AssumeRol │ Service:ecs-t │ │ │ │ rvice/TaskDef │ │ e │ asks.amazonaw │ │ │ │ /TaskRole.Arn │ │ │ s.com │ │ │ │ } │ │ │ │ │ ├───┼───────────────┼────────┼───────────────┼───────────────┼───────────┤ │ + │ ${MyFargateSe │ Allow │ logs:CreateLo │ AWS:${MyFarga │ │ │ │ rvice/TaskDef │ │ gStream │ teService/Tas │ │ │ │ /web/LogGroup │ │ logs:PutLogEv │ kDef/Executio │ │ │ │ .Arn} │ │ ents │ nRole} │ │ └───┴───────────────┴────────┴───────────────┴───────────────┴───────────┘ Security Group Changes ┌───┬────────────────────────┬─────┬────────────┬────────────────────────┐ │ │ Group │ Dir │ Protocol │ Peer │ ├───┼────────────────────────┼─────┼────────────┼────────────────────────┤ │ + │ ${MyFargateService/LB/ │ In │ TCP 80 │ Everyone (IPv4) │ │ │ SecurityGroup.GroupId} │ │ │ │ │ + │ ${MyFargateService/LB/ │ Out │ TCP 80 │ ${MyFargateService/Ser │ │ │ SecurityGroup.GroupId} │ │ │ vice/SecurityGroup.Gro │ │ │ │ │ │ upId} │ ├───┼────────────────────────┼─────┼────────────┼────────────────────────┤ │ + │ ${MyFargateService/Ser │ In │ TCP 80 │ ${MyFargateService/LB/ │ │ │ vice/SecurityGroup.Gro │ │ │ SecurityGroup.GroupId} │ │ │ upId} │ │ │ │ │ + │ ${MyFargateService/Ser │ Out │ Everything │ Everyone (IPv4) │ │ │ vice/SecurityGroup.Gro │ │ │ │ │ │ upId} │ │ │ │ └───┴────────────────────────┴─────┴────────────┴────────────────────────┘ (NOTE: There may be security-related changes not in this list. See https://github.com/aws/aws-cdk/issues/1299) Do you wish to deploy these changes (y/n)? y AwsCdkWithTypescriptFoundationsStack: deploying... AwsCdkWithTypescriptFoundationsStack: creating CloudFormation changeset... ✅ AwsCdkWithTypescriptFoundationsStack Outputs: AwsCdkWithTypescriptFoundationsStack.MyFargateServiceLoadBalancerDNS704F6391 = 50dc6c495c0c9188.elb.localhost.localstack.cloud AwsCdkWithTypescriptFoundationsStack.MyFargateServiceServiceURL4CF8398A = http://50dc6c495c0c9188.elb.localhost.localstack.cloud Stack ARN: arn:aws:cloudformation:us-east-1:000000000000:stack/AwsCdkWithTypescriptFoundationsStack/7c56b074
The output includes a public URL that we can now visit at http://50dc6c495c0c9188.elb.localhost.localstack.cloud/.
The container running locally
Updating our test
We can update our test by running npm t and copying the resources output and adding it to our stack.
import { expect as expectCDK, matchTemplate, MatchStyle, } from "@aws-cdk/assert"; import * as cdk from "@aws-cdk/core"; import * as AwsCdkWithTypescriptFoundations from "../lib/aws-cdk-with-typescript-foundations-stack"; test("Fargate Stack", () => { const app = new cdk.App(); // WHEN const stack = new AwsCdkWithTypescriptFoundations.AwsCdkWithTypescriptFoundationsStack( app, "MyTestStack" ); // THEN expectCDK(stack).to( matchTemplate( { Resources: { MyVpcF9F0CA6F: { Type: "AWS::EC2::VPC", Properties: { CidrBlock: "10.0.0.0/16", EnableDnsHostnames: true, EnableDnsSupport: true, InstanceTenancy: "default", Tags: [ { Key: "Name", Value: "MyTestStack/MyVpc", }, ], }, }, MyVpcPublicSubnet1SubnetF6608456: { Type: "AWS::EC2::Subnet", Properties: { CidrBlock: "10.0.0.0/18", VpcId: { Ref: "MyVpcF9F0CA6F", }, AvailabilityZone: { "Fn::Select": [ 0, { "Fn::GetAZs": "", }, ], }, MapPublicIpOnLaunch: true, Tags: [ { Key: "aws-cdk:subnet-name", Value: "Public", }, { Key: "aws-cdk:subnet-type", Value: "Public", }, { Key: "Name", Value: "MyTestStack/MyVpc/PublicSubnet1", }, ], }, }, MyVpcPublicSubnet1RouteTableC46AB2F4: { Type: "AWS::EC2::RouteTable", Properties: { VpcId: { Ref: "MyVpcF9F0CA6F", }, Tags: [ { Key: "Name", Value: "MyTestStack/MyVpc/PublicSubnet1", }, ], }, }, MyVpcPublicSubnet1RouteTableAssociation2ECEE1CB: { Type: "AWS::EC2::SubnetRouteTableAssociation", Properties: { RouteTableId: { Ref: "MyVpcPublicSubnet1RouteTableC46AB2F4", }, SubnetId: { Ref: "MyVpcPublicSubnet1SubnetF6608456", }, }, }, MyVpcPublicSubnet1DefaultRoute95FDF9EB: { Type: "AWS::EC2::Route", Properties: { RouteTableId: { Ref: "MyVpcPublicSubnet1RouteTableC46AB2F4", }, DestinationCidrBlock: "0.0.0.0/0", GatewayId: { Ref: "MyVpcIGW5C4A4F63", }, }, DependsOn: ["MyVpcVPCGW488ACE0D"], }, MyVpcPublicSubnet1EIP096967CB: { Type: "AWS::EC2::EIP", Properties: { Domain: "vpc", Tags: [ { Key: "Name", Value: "MyTestStack/MyVpc/PublicSubnet1", }, ], }, }, MyVpcPublicSubnet1NATGatewayAD3400C1: { Type: "AWS::EC2::NatGateway", Properties: { SubnetId: { Ref: "MyVpcPublicSubnet1SubnetF6608456", }, AllocationId: { "Fn::GetAtt": ["MyVpcPublicSubnet1EIP096967CB", "AllocationId"], }, Tags: [ { Key: "Name", Value: "MyTestStack/MyVpc/PublicSubnet1", }, ], }, }, MyVpcPublicSubnet2Subnet492B6BFB: { Type: "AWS::EC2::Subnet", Properties: { CidrBlock: "10.0.64.0/18", VpcId: { Ref: "MyVpcF9F0CA6F", }, AvailabilityZone: { "Fn::Select": [ 1, { "Fn::GetAZs": "", }, ], }, MapPublicIpOnLaunch: true, Tags: [ { Key: "aws-cdk:subnet-name", Value: "Public", }, { Key: "aws-cdk:subnet-type", Value: "Public", }, { Key: "Name", Value: "MyTestStack/MyVpc/PublicSubnet2", }, ], }, }, MyVpcPublicSubnet2RouteTable1DF17386: { Type: "AWS::EC2::RouteTable", Properties: { VpcId: { Ref: "MyVpcF9F0CA6F", }, Tags: [ { Key: "Name", Value: "MyTestStack/MyVpc/PublicSubnet2", }, ], }, }, MyVpcPublicSubnet2RouteTableAssociation227DE78D: { Type: "AWS::EC2::SubnetRouteTableAssociation", Properties: { RouteTableId: { Ref: "MyVpcPublicSubnet2RouteTable1DF17386", }, SubnetId: { Ref: "MyVpcPublicSubnet2Subnet492B6BFB", }, }, }, MyVpcPublicSubnet2DefaultRoute052936F6: { Type: "AWS::EC2::Route", Properties: { RouteTableId: { Ref: "MyVpcPublicSubnet2RouteTable1DF17386", }, DestinationCidrBlock: "0.0.0.0/0", GatewayId: { Ref: "MyVpcIGW5C4A4F63", }, }, DependsOn: ["MyVpcVPCGW488ACE0D"], }, MyVpcPublicSubnet2EIP8CCBA239: { Type: "AWS::EC2::EIP", Properties: { Domain: "vpc", Tags: [ { Key: "Name", Value: "MyTestStack/MyVpc/PublicSubnet2", }, ], }, }, MyVpcPublicSubnet2NATGateway91BFBEC9: { Type: "AWS::EC2::NatGateway", Properties: { SubnetId: { Ref: "MyVpcPublicSubnet2Subnet492B6BFB", }, AllocationId: { "Fn::GetAtt": ["MyVpcPublicSubnet2EIP8CCBA239", "AllocationId"], }, Tags: [ { Key: "Name", Value: "MyTestStack/MyVpc/PublicSubnet2", }, ], }, }, MyVpcPrivateSubnet1Subnet5057CF7E: { Type: "AWS::EC2::Subnet", Properties: { CidrBlock: "10.0.128.0/18", VpcId: { Ref: "MyVpcF9F0CA6F", }, AvailabilityZone: { "Fn::Select": [ 0, { "Fn::GetAZs": "", }, ], }, MapPublicIpOnLaunch: false, Tags: [ { Key: "aws-cdk:subnet-name", Value: "Private", }, { Key: "aws-cdk:subnet-type", Value: "Private", }, { Key: "Name", Value: "MyTestStack/MyVpc/PrivateSubnet1", }, ], }, }, MyVpcPrivateSubnet1RouteTable8819E6E2: { Type: "AWS::EC2::RouteTable", Properties: { VpcId: { Ref: "MyVpcF9F0CA6F", }, Tags: [ { Key: "Name", Value: "MyTestStack/MyVpc/PrivateSubnet1", }, ], }, }, MyVpcPrivateSubnet1RouteTableAssociation56D38C7E: { Type: "AWS::EC2::SubnetRouteTableAssociation", Properties: { RouteTableId: { Ref: "MyVpcPrivateSubnet1RouteTable8819E6E2", }, SubnetId: { Ref: "MyVpcPrivateSubnet1Subnet5057CF7E", }, }, }, MyVpcPrivateSubnet1DefaultRouteA8CDE2FA: { Type: "AWS::EC2::Route", Properties: { RouteTableId: { Ref: "MyVpcPrivateSubnet1RouteTable8819E6E2", }, DestinationCidrBlock: "0.0.0.0/0", NatGatewayId: { Ref: "MyVpcPublicSubnet1NATGatewayAD3400C1", }, }, }, MyVpcPrivateSubnet2Subnet0040C983: { Type: "AWS::EC2::Subnet", Properties: { CidrBlock: "10.0.192.0/18", VpcId: { Ref: "MyVpcF9F0CA6F", }, AvailabilityZone: { "Fn::Select": [ 1, { "Fn::GetAZs": "", }, ], }, MapPublicIpOnLaunch: false, Tags: [ { Key: "aws-cdk:subnet-name", Value: "Private", }, { Key: "aws-cdk:subnet-type", Value: "Private", }, { Key: "Name", Value: "MyTestStack/MyVpc/PrivateSubnet2", }, ], }, }, MyVpcPrivateSubnet2RouteTableCEDCEECE: { Type: "AWS::EC2::RouteTable", Properties: { VpcId: { Ref: "MyVpcF9F0CA6F", }, Tags: [ { Key: "Name", Value: "MyTestStack/MyVpc/PrivateSubnet2", }, ], }, }, MyVpcPrivateSubnet2RouteTableAssociation86A610DA: { Type: "AWS::EC2::SubnetRouteTableAssociation", Properties: { RouteTableId: { Ref: "MyVpcPrivateSubnet2RouteTableCEDCEECE", }, SubnetId: { Ref: "MyVpcPrivateSubnet2Subnet0040C983", }, }, }, MyVpcPrivateSubnet2DefaultRoute9CE96294: { Type: "AWS::EC2::Route", Properties: { RouteTableId: { Ref: "MyVpcPrivateSubnet2RouteTableCEDCEECE", }, DestinationCidrBlock: "0.0.0.0/0", NatGatewayId: { Ref: "MyVpcPublicSubnet2NATGateway91BFBEC9", }, }, }, MyVpcIGW5C4A4F63: { Type: "AWS::EC2::InternetGateway", Properties: { Tags: [ { Key: "Name", Value: "MyTestStack/MyVpc", }, ], }, }, MyVpcVPCGW488ACE0D: { Type: "AWS::EC2::VPCGatewayAttachment", Properties: { VpcId: { Ref: "MyVpcF9F0CA6F", }, InternetGatewayId: { Ref: "MyVpcIGW5C4A4F63", }, }, }, MyCluster4C1BA579: { Type: "AWS::ECS::Cluster", }, MyFargateServiceLBDE830E97: { Type: "AWS::ElasticLoadBalancingV2::LoadBalancer", Properties: { LoadBalancerAttributes: [ { Key: "deletion_protection.enabled", Value: "false", }, ], Scheme: "internet-facing", SecurityGroups: [ { "Fn::GetAtt": [ "MyFargateServiceLBSecurityGroup6FBF16F1", "GroupId", ], }, ], Subnets: [ { Ref: "MyVpcPublicSubnet1SubnetF6608456", }, { Ref: "MyVpcPublicSubnet2Subnet492B6BFB", }, ], Type: "application", }, DependsOn: [ "MyVpcPublicSubnet1DefaultRoute95FDF9EB", "MyVpcPublicSubnet2DefaultRoute052936F6", ], }, MyFargateServiceLBSecurityGroup6FBF16F1: { Type: "AWS::EC2::SecurityGroup", Properties: { GroupDescription: "Automatically created Security Group for ELB MyTestStackMyFargateServiceLB1C43A0E9", SecurityGroupIngress: [ { CidrIp: "0.0.0.0/0", Description: "Allow from anyone on port 80", FromPort: 80, IpProtocol: "tcp", ToPort: 80, }, ], VpcId: { Ref: "MyVpcF9F0CA6F", }, }, }, MyFargateServiceLBSecurityGrouptoMyTestStackMyFargateServiceSecurityGroup757F82AB805F4EF67B: { Type: "AWS::EC2::SecurityGroupEgress", Properties: { GroupId: { "Fn::GetAtt": [ "MyFargateServiceLBSecurityGroup6FBF16F1", "GroupId", ], }, IpProtocol: "tcp", Description: "Load balancer to target", DestinationSecurityGroupId: { "Fn::GetAtt": [ "MyFargateServiceSecurityGroup7016792A", "GroupId", ], }, FromPort: 80, ToPort: 80, }, }, MyFargateServiceLBPublicListener61A1042F: { Type: "AWS::ElasticLoadBalancingV2::Listener", Properties: { DefaultActions: [ { TargetGroupArn: { Ref: "MyFargateServiceLBPublicListenerECSGroup4A3EDF05", }, Type: "forward", }, ], LoadBalancerArn: { Ref: "MyFargateServiceLBDE830E97", }, Port: 80, Protocol: "HTTP", }, }, MyFargateServiceLBPublicListenerECSGroup4A3EDF05: { Type: "AWS::ElasticLoadBalancingV2::TargetGroup", Properties: { Port: 80, Protocol: "HTTP", TargetType: "ip", VpcId: { Ref: "MyVpcF9F0CA6F", }, }, }, MyFargateServiceTaskDefTaskRole62C7D397: { Type: "AWS::IAM::Role", Properties: { AssumeRolePolicyDocument: { Statement: [ { Action: "sts:AssumeRole", Effect: "Allow", Principal: { Service: "ecs-tasks.amazonaws.com", }, }, ], Version: "2012-10-17", }, }, }, MyFargateServiceTaskDef5DA17B39: { Type: "AWS::ECS::TaskDefinition", Properties: { ContainerDefinitions: [ { Essential: true, Image: "amazon/amazon-ecs-sample", LogConfiguration: { LogDriver: "awslogs", Options: { "awslogs-group": { Ref: "MyFargateServiceTaskDefwebLogGroup4A6C44E8", }, "awslogs-stream-prefix": "MyFargateService", "awslogs-region": { Ref: "AWS::Region", }, }, }, Name: "web", PortMappings: [ { ContainerPort: 80, Protocol: "tcp", }, ], }, ], Cpu: "256", ExecutionRoleArn: { "Fn::GetAtt": [ "MyFargateServiceTaskDefExecutionRoleD6305504", "Arn", ], }, Family: "MyTestStackMyFargateServiceTaskDef6235E468", Memory: "512", NetworkMode: "awsvpc", RequiresCompatibilities: ["FARGATE"], TaskRoleArn: { "Fn::GetAtt": [ "MyFargateServiceTaskDefTaskRole62C7D397", "Arn", ], }, }, }, MyFargateServiceTaskDefwebLogGroup4A6C44E8: { Type: "AWS::Logs::LogGroup", UpdateReplacePolicy: "Retain", DeletionPolicy: "Retain", }, MyFargateServiceTaskDefExecutionRoleD6305504: { Type: "AWS::IAM::Role", Properties: { AssumeRolePolicyDocument: { Statement: [ { Action: "sts:AssumeRole", Effect: "Allow", Principal: { Service: "ecs-tasks.amazonaws.com", }, }, ], Version: "2012-10-17", }, }, }, MyFargateServiceTaskDefExecutionRoleDefaultPolicyEC22B20F: { Type: "AWS::IAM::Policy", Properties: { PolicyDocument: { Statement: [ { Action: ["logs:CreateLogStream", "logs:PutLogEvents"], Effect: "Allow", Resource: { "Fn::GetAtt": [ "MyFargateServiceTaskDefwebLogGroup4A6C44E8", "Arn", ], }, }, ], Version: "2012-10-17", }, PolicyName: "MyFargateServiceTaskDefExecutionRoleDefaultPolicyEC22B20F", Roles: [ { Ref: "MyFargateServiceTaskDefExecutionRoleD6305504", }, ], }, }, MyFargateServiceF490C034: { Type: "AWS::ECS::Service", Properties: { Cluster: { Ref: "MyCluster4C1BA579", }, DeploymentConfiguration: { MaximumPercent: 200, MinimumHealthyPercent: 50, }, DesiredCount: 1, EnableECSManagedTags: false, HealthCheckGracePeriodSeconds: 60, LaunchType: "FARGATE", LoadBalancers: [ { ContainerName: "web", ContainerPort: 80, TargetGroupArn: { Ref: "MyFargateServiceLBPublicListenerECSGroup4A3EDF05", }, }, ], NetworkConfiguration: { AwsvpcConfiguration: { AssignPublicIp: "DISABLED", SecurityGroups: [ { "Fn::GetAtt": [ "MyFargateServiceSecurityGroup7016792A", "GroupId", ], }, ], Subnets: [ { Ref: "MyVpcPrivateSubnet1Subnet5057CF7E", }, { Ref: "MyVpcPrivateSubnet2Subnet0040C983", }, ], }, }, TaskDefinition: { Ref: "MyFargateServiceTaskDef5DA17B39", }, }, DependsOn: [ "MyFargateServiceLBPublicListenerECSGroup4A3EDF05", "MyFargateServiceLBPublicListener61A1042F", ], }, MyFargateServiceSecurityGroup7016792A: { Type: "AWS::EC2::SecurityGroup", Properties: { GroupDescription: "MyTestStack/MyFargateService/Service/SecurityGroup", SecurityGroupEgress: [ { CidrIp: "0.0.0.0/0", Description: "Allow all outbound traffic by default", IpProtocol: "-1", }, ], VpcId: { Ref: "MyVpcF9F0CA6F", }, }, }, MyFargateServiceSecurityGroupfromMyTestStackMyFargateServiceLBSecurityGroupE6A072BD80B62F5F02: { Type: "AWS::EC2::SecurityGroupIngress", Properties: { IpProtocol: "tcp", Description: "Load balancer to target", FromPort: 80, GroupId: { "Fn::GetAtt": [ "MyFargateServiceSecurityGroup7016792A", "GroupId", ], }, SourceSecurityGroupId: { "Fn::GetAtt": [ "MyFargateServiceLBSecurityGroup6FBF16F1", "GroupId", ], }, ToPort: 80, }, }, }, Outputs: { MyFargateServiceLoadBalancerDNS704F6391: { Value: { "Fn::GetAtt": ["MyFargateServiceLBDE830E97", "DNSName"], }, }, MyFargateServiceServiceURL4CF8398A: { Value: { "Fn::Join": [ "", [ "http://", { "Fn::GetAtt": ["MyFargateServiceLBDE830E97", "DNSName"], }, ], ], }, }, }, }, MatchStyle.EXACT ) ); });
Running our test again will yield the following output:
$ npm t > aws-cdk-with-typescript-foundations@0.1.0 test > jest PASS test/aws-cdk-with-typescript-foundations.test.ts ✓ Fargate Stack (294 ms) Test Suites: 1 passed, 1 total Tests: 1 passed, 1 total Snapshots: 0 total Time: 4.407 s, estimated 6 s Ran all test suites.
Tear down
I had an issue with the teardown on LocalStack for this one, but stopping Docker will do the trick.
Summary
Today's post demonstrated how to deploy a Fargate cluster locally to LocalStack using the AWS CDK.
Resources and further reading
Photo credit: lucabravo
Dennis O'Keeffe
Melbourne, Australia
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Deploying A Fargate Cluster With LocalStack And The AWS CDK
Introduction
