deploy.sh

#!/bin/bash

main() {
  PRODUCTION_SERVER="https://habitbread.com"

  BLUE_SERVER="http://localhost:3000"
  GREEN_SERVER="http://localhost:4000"

  BLUE=$(curl -s $BLUE_SERVER)
  GREEN=$(curl -s $GREEN_SERVER)

  if [ -z "$BLUE" ]
  then
    echo "Changing Green -> Blue Server"
    sudo cp -f -v ./nginx/conf.d/upstream.blue.conf ./nginx/conf.d/upstream.conf

    docker-compose -f docker-compose.blue.yml up -d

    wait_server $BLUE_SERVER
    if [ $? -eq 0 ]; then exit 1; fi # Response fail

    docker exec -t node-nginx-lb service nginx reload

    wait_server $PRODUCTION_SERVER
    if [ $? -eq 0 ]; then # Response fail -> restore
      sudo cp -f ./nginx/conf.d/upstream.green.conf ./nginx/conf.d/upstream.conf
      docker exec -t node-nginx-lb service nginx reload
      docker-compose -f docker-compose.blue.yml down  
    else # Success
      docker-compose -f docker-compose.green.yml down
      docker exec -t node-server-blue pm2 scale node-server 2
    fi
  else
    echo "Changing Blue -> Green Server"
    sudo cp -f -v ./nginx/conf.d/upstream.green.conf ./nginx/conf.d/upstream.conf

    docker-compose -f docker-compose.green.yml up -d

    wait_server $GREEN_SERVER 
    if [ $? -eq 0 ]; then exit 1; fi

    docker exec -t node-nginx-lb service nginx reload
    
    wait_server $PRODUCTION_SERVER
    if [ $? -eq 0 ]; then # Response fail -> restore
      sudo cp -f ./nginx/conf.d/upstream.blue.conf ./nginx/conf.d/upstream.conf
      docker exec -t node-nginx-lb service nginx reload
      docker-compose -f docker-compose.green.yml down
    else # Success
      docker-compose -f docker-compose.blue.yml down
      docker exec -t node-server-green pm2 scale node-server 2
    fi
  fi
}

# 서버 올라갈 때 까지 wait하는 함수
function wait_server() {
  SERVER_URL=$1
  max_iterations=10
  iterations=1

  while true; do
    echo "$SERVER_URL : Connection Count $iterations"
    sleep 5

    http_code=$(curl -s -o /dev/null -w '%{http_code}' $SERVER_URL)
    if [ $http_code -eq 200 ]; then # ==
      echo "Server Up"; return 1;
    fi

    if [ $iterations -ge $max_iterations ]; then # >=
      echo "Loop Timeout"; return 0;
    fi
    ((iterations++))
  done
}

# 메인 함수 실행
main