Deploy new version of container without downtime

deploy.sh

if [ -z "$1" ]; then
  echo "Service name missing"
  exit 1
fi

service_name="$1"
old_container_id=$(docker-compose ps -q $service_name | tail -n1)

docker-compose pull $service_name

echo "Adding container with new image"
docker-compose up -d --scale $service_name=2 --no-recreate $service_name

new_container_id=$(docker-compose ps -q $service_name | head -n1)

echo "Waiting for new container to be healthy"
until [ "`docker inspect -f {{.State.Health.Status}} $new_container_id`" = "healthy" ]; do
    sleep 1;
done;

echo "New container is healthy, stopping old container"
docker stop $old_container_id

echo "Removing old container"
docker rm $old_container_id

echo "Scaling down to 1 container"
docker-compose up -d --scale $service_name=1 --no-recreate $service_name