software.amazon.awscdk.services.ecs

Class PlacementStrategy

java.lang.Object

software.amazon.jsii.JsiiObject

software.amazon.awscdk.services.ecs.PlacementStrategy

@Generated(value="jsii-pacmak/1.52.1 (build 5ccc8f6)",
           date="2022-01-27T11:49:02.291Z")
public class PlacementStrategy
extends software.amazon.jsii.JsiiObject

The placement strategies to use for tasks in the service. For more information, see [Amazon ECS Task Placement Strategies](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-placement-strategies.html).

Tasks will preferentially be placed on instances that match these rules.

Example:

 IVpc vpc = Vpc.fromLookup(this, "Vpc", VpcLookupOptions.builder()
         .isDefault(true)
         .build());
 Cluster cluster = Cluster.Builder.create(this, "Ec2Cluster").vpc(vpc).build();
 cluster.addCapacity("DefaultAutoScalingGroup", AddCapacityOptions.builder()
         .instanceType(new InstanceType("t2.micro"))
         .vpcSubnets(SubnetSelection.builder().subnetType(SubnetType.PUBLIC).build())
         .build());
 TaskDefinition taskDefinition = TaskDefinition.Builder.create(this, "TD")
         .compatibility(Compatibility.EC2)
         .build();
 taskDefinition.addContainer("TheContainer", ContainerDefinitionOptions.builder()
         .image(ContainerImage.fromRegistry("foo/bar"))
         .memoryLimitMiB(256)
         .build());
 EcsRunTask runTask = EcsRunTask.Builder.create(this, "Run")
         .integrationPattern(IntegrationPattern.RUN_JOB)
         .cluster(cluster)
         .taskDefinition(taskDefinition)
         .launchTarget(EcsEc2LaunchTarget.Builder.create()
                 .placementStrategies(List.of(PlacementStrategy.spreadAcrossInstances(), PlacementStrategy.packedByCpu(), PlacementStrategy.randomly()))
                 .placementConstraints(List.of(PlacementConstraint.memberOf("blieptuut")))
                 .build())
         .build();
 

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PlacementStrategy(software.amazon.jsii.JsiiObject.InitializationMode initializationMode)
protected	PlacementStrategy(software.amazon.jsii.JsiiObjectRef objRef)

Method Summary

Modifier and Type	Method and Description
static PlacementStrategy	packedBy(BinPackResource resource) Places tasks on the container instances with the least available capacity of the specified resource.
static PlacementStrategy	packedByCpu() Places tasks on container instances with the least available amount of CPU capacity.
static PlacementStrategy	packedByMemory() Places tasks on container instances with the least available amount of memory capacity.
static PlacementStrategy	randomly() Places tasks randomly.
static PlacementStrategy	spreadAcross(java.lang.String... fields) Places tasks evenly based on the specified value.
static PlacementStrategy	spreadAcrossInstances() Places tasks evenly across all container instances in the cluster.
java.util.List<CfnService.PlacementStrategyProperty>	toJson() Return the placement JSON.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PlacementStrategy

protected PlacementStrategy(software.amazon.jsii.JsiiObjectRef objRef)

PlacementStrategy

protected PlacementStrategy(software.amazon.jsii.JsiiObject.InitializationMode initializationMode)

Method Detail

packedBy

public static PlacementStrategy packedBy(BinPackResource resource)

Places tasks on the container instances with the least available capacity of the specified resource.

Parameters:

resource - This parameter is required.

packedByCpu

public static PlacementStrategy packedByCpu()

Places tasks on container instances with the least available amount of CPU capacity.

This minimizes the number of instances in use.

packedByMemory

public static PlacementStrategy packedByMemory()

Places tasks on container instances with the least available amount of memory capacity.

This minimizes the number of instances in use.

randomly

public static PlacementStrategy randomly()

Places tasks randomly.

spreadAcross

public static PlacementStrategy spreadAcross(java.lang.String... fields)

Places tasks evenly based on the specified value.

You can use one of the built-in attributes found on BuiltInAttributes or supply your own custom instance attributes. If more than one attribute is supplied, spreading is done in order.

Default: attributes instanceId

Parameters:

fields - This parameter is required.

spreadAcrossInstances

public static PlacementStrategy spreadAcrossInstances()

Places tasks evenly across all container instances in the cluster.

toJson

public java.util.List<CfnService.PlacementStrategyProperty> toJson()

Return the placement JSON.