Update the ECS agent from ElasticBeanstalk

01-update-ecs-agent.config

{
    "commands": {
        "01ecsupdate": {"command": ".os-config/scripts/ecs-agent-update.sh"},
        "99completed": {"command": "logger -t update-ecs-agent completed"}
    }
}

ecs-agent-update.sh

#!/bin/bash
# install this to .os-config/scripts/ecs-agent-update.sh

ECS_INIT_VER=`curl -sS http://localhost:51678/v1/metadata | jq -r .Version`

echo $ECS_INIT_VER | grep '1.6.0'

if [ $? -eq 0 ]
then
    echo "Found outdated version of ECS agent"
    NEEDS_UPDATE=1
else
    echo "ECS agent is newer than 1.6.0"
    NEEDS_UPDATE=0
fi

if [ $NEEDS_UPDATE -eq 1 ]
then
    EB_CONFIG_ECS_CLUSTER=`/opt/elasticbeanstalk/bin/get-config container -k ecs_cluster`
    CONTAINER_ID=`curl -sS http://localhost:51678/v1/metadata | jq -r .ContainerInstanceArn`

    echo "Starting ECS agent update..."
    aws ecs update-container-agent --cluster $EB_CONFIG_ECS_CLUSTER --container-instance $CONTAINER_ID
    echo "ECS agent update has started, goodbye."
    exit 0

else
    echo "Not updating ECS agent, goodbye."
    exit 0
fi