aws-cdk.aws-ecs-patterns 1.5.0

CDK Constructs for AWS ECS

CDK Construct library for higher-level ECS Constructs

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This is a developer preview (public beta) module. Releases might lack important features and might have future breaking changes.

This API is still under active development and subject to non-backward compatible changes or removal in any future version. Use of the API is not recommended in production environments. Experimental APIs are not subject to the Semantic Versioning model.

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

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

Load Balanced Services

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

• LoadBalancedEc2Service

const loadBalancedEcsService = new ecsPatterns.LoadBalancedEc2Service(stack, 'Service', {
  cluster,
  memoryLimitMiB: 1024,
  image: ecs.ContainerImage.fromRegistry('test'),
  desiredCount: 2,
  environment: {
    TEST_ENVIRONMENT_VARIABLE1: "test environment variable 1 value",
    TEST_ENVIRONMENT_VARIABLE2: "test environment variable 2 value"
  }
});

• LoadBalancedFargateService

const loadBalancedFargateService = new ecsPatterns.LoadBalancedFargateService(stack, 'Service', {
  cluster,
  memoryLimitMiB: 1024,
  cpu: 512,
  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 on 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.

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(this, 'ScheduledTask', {
  cluster,
  image: ecs.ContainerImage.fromRegistry("amazon/amazon-ecs-sample"),
  scheduleExpression: 'rate(1 minute)',
  environment: [{ name: 'TRIGGER', value: 'CloudWatch Events' }],
  memoryLimitMiB: 256
});