services.x-ecs

This service level extension will allow to set some of the ECS Service properties

Syntax Reference 

services:
  serviceA:
    image: nginx/nginx
    x-ecs:
      CapacityProviderStrategy: [CapacityProviderStrategyItem]

See also

Tip

You can find the test files here to use as reference for your use-case.

CapacityProviderStrategy

List of CapacityProviderStrategyItem that allows to define the CapacityProviders you wish to use for this service, that comes as an override of the Cluster defined default CapacityProviderStrategy.

Warning

The CapacityProvider defined in the list must be a defined capacity provider in the ECS Cluster.

Hint

When using x-cluster.Lookup, the cluster properties will be evaluated to identify what capacity providers are defined on the cluster.

When assigning the capacity provider to the services, ECS Compose-X will ensure (fail) that the Capacity Providers defined in x-ecs are present in the ECS Cluster.

If the cluster has no Capacity Provider defined, validation is skipped.

Attention

When using x-cluster.Use, no validation is performed on the cluster to evaluate available capacity providers.

Examples

Simple service definition 
services:
  grafana:
    x-ecs:
      CapacityProviderStrategy:
        - CapacityProvider: FARGATE
          Base: 1
          Weight: 2
        - CapacityProvider: FARGATE_SPOT
          Base: 4
          Weight: 8
Merged definitions 
services:
  grafana:
    deploy:
      labels:
        ecs.task.family: grafana
    x-ecs:
      CapacityProviderStrategy:
        - CapacityProvider: FARGATE
          Base: 1
          Weight: 2
  nginx:
    deploy:
      labels:
        ecs.task.family: grafana
    x-ecs:
      CapacityProviderStrategy:
        - CapacityProvider: FARGATE
          Base: 0
          Weight: 3
        - CapacityProvider: FARGATE_SPOT
          Base: 4
          Weight: 8

In the above example, where grafana and nginx are part of the same task definition and therefore same ECS Service, we do the following:

  • If a capacity provider is set in only one service, we use it for both as-is

  • If they both define properties for a same CapacityProvider, here, FARGATE, we take the maximum value of the set.

    Here we take 1 for Base (from grafana) and 3 for Weight (from nginx).