https://andreacarriero.com/2018/05/15/circleci-deployment-to-aws-ecs

circleci-deploy-to-aws-ecs.yml

docker:
    - image: circleci/python:3.6.1

steps:
    - checkout
    - setup_remote_docker

    - run:
        name: Install AWScli
        command: pip install awscli --upgrade --user

    - run:
        name: Build Docker image
        command: docker build -t $CIRCLE_PROJECT_REPONAME:$CIRCLE_SHA1 .

    - run:
        name: Push Docker image to ECR
        command: |
        eval $(python -m awscli ecr get-login --region us-west-2)
        docker tag $CIRCLE_PROJECT_REPONAME:$CIRCLE_SHA1 $AWS_ACCOUNT_ID.dkr.ecr.$AWS_REGION.amazonaws.com/$CIRCLE_PROJECT_REPONAME:$CIRCLE_SHA1
        docker push $AWS_ACCOUNT_ID.dkr.ecr.$AWS_REGION.amazonaws.com/$CIRCLE_PROJECT_REPONAME:$CIRCLE_SHA1

    - run:
        name: Update task definition and service in ECS
        command: |
        
        containers=$(printf '[
            {
            "name": "web",
            "image": "%s.dkr.ecr.%s.amazonaws.com/%s:%s",
            "portMappings": [
                {
                "protocol": "tcp",
                "containerPort": 5000,
                "hostPort": 0
                }
            ],
            "logConfiguration": {
                "logDriver": "awslogs",
                "options": {
                "awslogs-region": "%s",
                "awslogs-stream-prefix": "ecs",
                "awslogs-group": "/ecs/%s"
                }
            },
            "memory": 128,
            "essential": true
            }
        ]' $AWS_ACCOUNT_ID $AWS_REGION $CIRCLE_PROJECT_REPONAME $CIRCLE_SHA1 $AWS_REGION $AWS_ECS_TASK_NAME)

        echo "$containers"

        task_definition=$(python -m awscli ecs register-task-definition --container-definitions "$containers" --family $AWS_ECS_TASK_NAME --region $AWS_REGION)

        revision=$(echo $task_definition | jq '.["taskDefinition"]["revision"]')

        python -m awscli ecs update-service --cluster "$AWS_ECS_CLUSTER" --service "$AWS_ECS_SERVICE" --task-definition "$AWS_ECS_TASK_NAME":"$revision" --region $AWS_REGION