# 1. update your aws cli
# https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-install.html
#
# 2. update your existing cluster with capacity providers support
CLUSTER_NAME=fargate
SERVICE_NAME=myservice
FARGATE_WEIGHT=1
FARGATE_SPOT_WEIGHT=1
FARGATE_BASE=1
FARGATE_SPOT_BASE=0

# update the existing cluster
aws ecs put-cluster-capacity-providers --cluster ${CLUSTER_NAME}  \
--capacity-providers FARGATE FARGATE_SPOT \
--default-capacity-provider-strategy capacityProvider=FARGATE_SPOT,weight=1

# update existing service
aws ecs update-service --cluster fargate --service ${SERVICE_NAME} \
--capacity-provider-strategy capacityProvider=FARGATE_SPOT,weight=${FARGATE_SPOT_WEIGHT},base=${FARGATE_SPOT_BASE} \
capacityProvider=FARGATE,weight=${FARGATE_WEIGHT},base=${FARGATE_BASE} --force-new-deployment

# describe the service to see its capacityProviderStrategy
aws ecs describe-services --cluster ${CLUSTER_NAME} --service ${SERVICE_NAME} --query 'services[0].capacityProviderStrategy'                    
[
    {
        "capacityProvider": "FARGATE_SPOT",
        "weight": 1,
        "base": 0
    },
    {
        "capacityProvider": "FARGATE",
        "weight": 1,
        "base": 1
    }
]