aws-cdk.aws-ecs-patterns 1.12.0

CDK Constructs for AWS ECS

CDK Construct library for higher-level ECS Constructs

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This library provides higher-level Amazon ECS constructs which follow common architectural patterns. It contains:

• Application Load Balanced Services
• Network Load Balanced Services
• Queue Processing Services
• Scheduled Tasks (cron jobs)

Application Load Balanced Services

To define an Amazon ECS service that is behind an application load balancer, instantiate one of the following:

• ApplicationLoadBalancedEc2Service

const loadBalancedEcsService = new ecsPatterns.ApplicationLoadBalancedEc2Service(stack, 'Service', {
  cluster,
  memoryLimitMiB: 1024,
  taskImageOptions: {
    image: ecs.ContainerImage.fromRegistry('test'),
    environment: {
      TEST_ENVIRONMENT_VARIABLE1: "test environment variable 1 value",
      TEST_ENVIRONMENT_VARIABLE2: "test environment variable 2 value"
    },
  },
  desiredCount: 2,
});

• ApplicationLoadBalancedFargateService

const loadBalancedFargateService = new ecsPatterns.ApplicationLoadBalancedFargateService(stack, 'Service', {
  cluster,
  memoryLimitMiB: 1024,
  cpu: 512,
  taskImageOptions: {
    image: ecs.ContainerImage.fromRegistry("amazon/amazon-ecs-sample"),
  },
});

Instead of providing a cluster you can specify a VPC and CDK will create a new ECS cluster. If you deploy multiple services CDK will only create one cluster per VPC.

You can omit cluster and vpc to let CDK create a new VPC with two AZs and create a cluster inside this VPC.

Network Load Balanced Services

To define an Amazon ECS service that is behind a network load balancer, instantiate one of the following:

• NetworkLoadBalancedEc2Service

const loadBalancedEcsService = new ecsPatterns.NetworkLoadBalancedEc2Service(stack, 'Service', {
  cluster,
  memoryLimitMiB: 1024,
  taskImageOptions: {
    image: ecs.ContainerImage.fromRegistry('test'),
    environment: {
      TEST_ENVIRONMENT_VARIABLE1: "test environment variable 1 value",
      TEST_ENVIRONMENT_VARIABLE2: "test environment variable 2 value"
    },
  },
  desiredCount: 2,
});

• NetworkLoadBalancedFargateService

const loadBalancedFargateService = new ecsPatterns.NetworkLoadBalancedFargateService(stack, 'Service', {
  cluster,
  memoryLimitMiB: 1024,
  cpu: 512,
  taskImageOptions: {
    image: ecs.ContainerImage.fromRegistry("amazon/amazon-ecs-sample"),
  },
});

The CDK will create a new Amazon ECS cluster if you specify a VPC and omit cluster. If you deploy multiple services the CDK will only create one cluster per VPC.

If cluster and vpc are omitted, the CDK creates a new VPC with subnets in two Availability Zones and a cluster within this VPC.

Queue Processing Services

To define a service that creates a queue and reads from that queue, instantiate one of the following:

• QueueProcessingEc2Service

const queueProcessingEc2Service = new QueueProcessingEc2Service(stack, 'Service', {
  cluster,
  memoryLimitMiB: 1024,
  image: ecs.ContainerImage.fromRegistry('test'),
  command: ["-c", "4", "amazon.com"],
  enableLogging: false,
  desiredTaskCount: 2,
  environment: {
    TEST_ENVIRONMENT_VARIABLE1: "test environment variable 1 value",
    TEST_ENVIRONMENT_VARIABLE2: "test environment variable 2 value"
  },
  queue,
  maxScalingCapacity: 5
});

• QueueProcessingFargateService

const queueProcessingFargateService = new QueueProcessingFargateService(stack, 'Service', {
  cluster,
  memoryLimitMiB: 512,
  image: ecs.ContainerImage.fromRegistry('test'),
  command: ["-c", "4", "amazon.com"],
  enableLogging: false,
  desiredTaskCount: 2,
  environment: {
    TEST_ENVIRONMENT_VARIABLE1: "test environment variable 1 value",
    TEST_ENVIRONMENT_VARIABLE2: "test environment variable 2 value"
  },
  queue,
  maxScalingCapacity: 5
});

Scheduled Tasks

To define a task that runs periodically, instantiate an ScheduledEc2Task:

// Instantiate an Amazon EC2 Task to run at a scheduled interval
const ecsScheduledTask = new ScheduledEc2Task(stack, 'ScheduledTask', {
  cluster,
  scheduledEc2TaskImageOptions: {
    image: ecs.ContainerImage.fromRegistry('amazon/amazon-ecs-sample'),
    memoryLimitMiB: 256,
    environment: { name: 'TRIGGER', value: 'CloudWatch Events' },
  },
  schedule: events.Schedule.expression('rate(1 minute)')
});