Script for docker-compose deploy with zero downtime

docker-compose-zero-downtime.sh

#!/bin/bash

DOCKER_COMPOSE_NAME='web'
DOCKER_COMPOSE_FOLDER='/home/mateus/Projetos/api-agro1'

cd $DOCKER_COMPOSE_FOLDER

echo '==> Pulling...'
docker-compose pull

echo '==> Scaling...'
container_name=`docker-compose ps | grep -m 1 $DOCKER_COMPOSE_NAME | cut -d " " -f1`
docker-compose up -d --no-deps --scale $DOCKER_COMPOSE_NAME=2 --no-recreate

new_container_name=`docker-compose ps | grep $DOCKER_COMPOSE_NAME | tail -1 | cut -d " " -f1`
echo "New container is $new_container_name"

echo '==> Waiting for health...'
while true; do
  if [[ `docker inspect --format='{{json .State.Health.Status}}' $new_container_name` = *"\"healthy\""* ]]; then
    break
  fi
  echo "$(date) - still trying"
  sleep 5
done
echo '==> New container is running!!!'

echo '==> Removing old container...'
sleep 1
docker rm --force $container_name

exit 0