@scloud/cdk-patterns
Version:
Serverless CDK patterns for common infrastructure needs
97 lines • 16.2 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.FargateService = void 0;
const aws_certificatemanager_1 = require("aws-cdk-lib/aws-certificatemanager");
const aws_cdk_lib_1 = require("aws-cdk-lib");
const aws_elasticloadbalancingv2_1 = require("aws-cdk-lib/aws-elasticloadbalancingv2");
const aws_ec2_1 = require("aws-cdk-lib/aws-ec2");
const aws_ecs_patterns_1 = require("aws-cdk-lib/aws-ecs-patterns");
const aws_ecs_1 = require("aws-cdk-lib/aws-ecs");
const aws_logs_1 = require("aws-cdk-lib/aws-logs");
const constructs_1 = require("constructs");
const EcrRepository_1 = require("./EcrRepository");
/**
* Builds an ApplicationLoadBalancedFargateService that runs a container on ECS Fargate.
*
* Warning! This pattern is not 'pure' serverless! It gennerates 24x7 running costs per container (rather than being billed on traffic/storage).
*
* Warning! If you don't pass a vpc, this construct creates a vpc for you and limits the nuber of NAT gateways to 1 to reduce cost. This is less resilient, but NAT gateways are costly!
*
* If you'd like to avoid this tradeoof, pass in a vpc you've createed that ha zero NAT gateways and is configured with PrivateEndpoint(s) that will allow ECS to pull container images.
*
* @param serviceName Name for the service
* @param zone DNS zone
* @param domain Optional: by default the zone name will be used as the DNS name for the service (e.g. 'example.com') but you can specify a different domain here (e.g. 'subdomain.example.com').
* @param environment Any environment variables for the container
* @param repository Optional: if you want to use an existing container image repository
* @param tag Optional: defaults to 'latest'
* @param vpc Optional: if you want to use an existing VPC. In not set, a vpc will be created for you
* @param cpu Optional: defaults to 512
* @param memory Optional: defaults to 1024
* @param taskCount Optional: defaults to 2 for redundancy. Set to 1 if you want to reduce cost.
* @param zeroTasks Sets task count to zero. Pass true if you don't have an image in ECR yet, otherwise this construct will fail to build.
* @param containerPort Optional: defaults to 3000. This is the port the application in your container listens on.
* @returns Deplyment detais
*/
class FargateService extends constructs_1.Construct {
constructor(scope, id, serviceName, zone, domain, environment = {}, repository = undefined, tag = 'latest', vpc = undefined, cpu = 512, memory = 1024, taskCount = 2, zeroTasks = false, containerPort = 3000) {
super(scope, `${id}FargateService`);
// Container repository
this.repository = repository || new EcrRepository_1.EcrRepository(scope, id);
// It seems like NAT gateways are costly, so I've set this up to avoid that - only creating one.
// At some point we may want to figure out a privte endpoint so that we can retire the NAT.
// Based on: https://www.binarythinktank.com/blog/truly-serverless-container
// and https://stackoverflow.com/questions/64299664/how-to-configure-aws-cdk-applicationloadbalancedfargateservice-to-log-parsed-jso
this.vpc = vpc || new aws_ec2_1.Vpc(scope, `${id}Vpc`, {
natGateways: 1,
subnetConfiguration: [{
name: id,
subnetType: aws_ec2_1.SubnetType.PUBLIC,
}],
});
// Fargate
this.albFargateService = new aws_ecs_patterns_1.ApplicationLoadBalancedFargateService(scope, `${id}AlbFargateService`, {
loadBalancerName: id,
serviceName,
domainZone: zone,
domainName: domain || zone.zoneName,
certificate: new aws_certificatemanager_1.DnsValidatedCertificate(scope, id, {
domainName: domain || zone.zoneName,
hostedZone: zone,
}),
protocol: aws_elasticloadbalancingv2_1.ApplicationProtocol.HTTPS,
cpu,
memoryLimitMiB: memory,
taskImageOptions: {
containerName: id,
image: aws_ecs_1.ContainerImage.fromEcrRepository(this.repository, tag),
containerPort,
environment,
logDriver: aws_ecs_1.LogDrivers.awsLogs({
streamPrefix: id,
logGroup: new aws_logs_1.LogGroup(scope, `${id}LogGroup`, {
// Ensure the log group is deleted when the stack is deleted
// and that logs aren't retained indefinitely
logGroupName: `/${aws_cdk_lib_1.Stack.of(scope).stackName}/ecs/${id}`,
removalPolicy: aws_cdk_lib_1.RemovalPolicy.DESTROY,
retention: aws_logs_1.RetentionDays.THREE_MONTHS,
}),
}),
},
desiredCount: taskCount,
vpc: this.vpc,
// ? https://stackoverflow.com/questions/67301268/aws-fargate-resourceinitializationerror-unable-to-pull-secrets-or-registry-auth
assignPublicIp: true,
});
this.albFargateService.loadBalancer.addRedirect(); // http -> https
if (zeroTasks) {
// On the first deploy, when there's no image in the repository, setting desired tasks to zero allows this construct to build, otherwise :
// https://github.com/aws/aws-cdk/issues/3646#issuecomment-623919242
const { node } = this.albFargateService.service;
const cfnService = node.findChild('Service');
cfnService.desiredCount = 0;
}
}
}
exports.FargateService = FargateService;
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This pattern is not 'pure' serverless! It gennerates 24x7 running costs per container (rather than being billed on traffic/storage).\n *\n * Warning! If you don't pass a vpc, this construct creates a vpc for you and limits the nuber of NAT gateways to 1 to reduce cost. This is less resilient, but NAT gateways are costly!\n *\n * If you'd like to avoid this tradeoof, pass in a vpc you've createed that ha zero NAT gateways and is configured with PrivateEndpoint(s) that will allow ECS to pull container images.\n *\n * @param serviceName Name for the service\n * @param zone DNS zone\n * @param domain Optional: by default the zone name will be used as the DNS name for the service (e.g. 'example.com') but you can specify a different domain here (e.g. 'subdomain.example.com').\n * @param environment Any environment variables for the container\n * @param repository Optional: if you want to use an existing container image repository\n * @param tag Optional: defaults to 'latest'\n * @param vpc Optional: if you want to use an existing VPC. In not set, a vpc will be created for you\n * @param cpu Optional: defaults to 512\n * @param memory Optional: defaults to 1024\n * @param taskCount Optional: defaults to 2 for redundancy. Set to 1 if you want to reduce cost.\n * @param zeroTasks Sets task count to zero. Pass true if you don't have an image in ECR yet, otherwise this construct will fail to build.\n * @param containerPort Optional: defaults to 3000. This is the port the application in your container listens on.\n * @returns Deplyment detais\n */\nexport class FargateService extends Construct {\n  certificate: DnsValidatedCertificate;\n\n  repository: Repository;\n\n  albFargateService: ApplicationLoadBalancedFargateService;\n\n  vpc: Vpc;\n\n  constructor(\n    scope: Construct,\n    id: string,\n    serviceName: string,\n    zone: IHostedZone,\n    domain?: string,\n    environment: { [key: string]: string; } = {},\n    repository: Repository | undefined = undefined,\n    tag: string = 'latest',\n    vpc: Vpc | undefined = undefined,\n    cpu: number = 512,\n    memory: number = 1024,\n    taskCount: number = 2,\n    zeroTasks: boolean = false,\n    containerPort: number = 3000,\n  ) {\n    super(scope, `${id}FargateService`);\n\n    // Container repository\n    this.repository = repository || new EcrRepository(scope, id);\n    // It seems like NAT gateways are costly, so I've set this up to avoid that - only creating one.\n    // At some point we may want to figure out a privte endpoint so that we can retire the NAT.\n    // Based on: https://www.binarythinktank.com/blog/truly-serverless-container\n    // and https://stackoverflow.com/questions/64299664/how-to-configure-aws-cdk-applicationloadbalancedfargateservice-to-log-parsed-jso\n    this.vpc = vpc || new Vpc(scope, `${id}Vpc`, {\n      natGateways: 1,\n      subnetConfiguration: [{\n        name: id,\n        subnetType: SubnetType.PUBLIC,\n      }],\n    });\n\n    // Fargate\n    this.albFargateService = new ApplicationLoadBalancedFargateService(\n      scope,\n      `${id}AlbFargateService`,\n      {\n        loadBalancerName: id,\n        serviceName,\n        domainZone: zone,\n        domainName: domain || zone.zoneName,\n        certificate: new DnsValidatedCertificate(scope, id, {\n          domainName: domain || zone.zoneName,\n          hostedZone: zone,\n        }),\n        protocol: ApplicationProtocol.HTTPS,\n        cpu,\n        memoryLimitMiB: memory,\n        taskImageOptions: {\n          containerName: id,\n          image: ContainerImage.fromEcrRepository(this.repository, tag),\n          containerPort,\n          environment,\n          logDriver: LogDrivers.awsLogs({\n            streamPrefix: id,\n            logGroup: new LogGroup(scope, `${id}LogGroup`, {\n              // Ensure the log group is deleted when the stack is deleted\n              // and that logs aren't retained indefinitely\n              logGroupName: `/${Stack.of(scope).stackName}/ecs/${id}`,\n              removalPolicy: RemovalPolicy.DESTROY,\n              retention: RetentionDays.THREE_MONTHS,\n            }),\n          }),\n        },\n        desiredCount: taskCount,\n        vpc: this.vpc,\n        // ? https://stackoverflow.com/questions/67301268/aws-fargate-resourceinitializationerror-unable-to-pull-secrets-or-registry-auth\n        assignPublicIp: true,\n      },\n    );\n    this.albFargateService.loadBalancer.addRedirect(); // http -> https\n\n    if (zeroTasks) {\n      // On the first deploy, when there's no image in the repository, setting desired tasks to zero allows this construct to build, otherwise :\n      // https://github.com/aws/aws-cdk/issues/3646#issuecomment-623919242\n      const { node } = this.albFargateService.service;\n      const cfnService = node.findChild('Service') as CfnService;\n      cfnService.desiredCount = 0;\n    }\n  }\n}\n"]}