[DEPLOY] nginx 무중단 배포 설정

[JungYoonShin]

📄 Work Description

• nginx 무중단 배포 설정

⚙️ ISSUE

• closed [DEPLOY] nginx 무중단 배포 설정 #124

📷 Screenshot

• 동영상, 사진, 로그 등등
• ex) 큐알 성공 이미지, 스웨거, 포스트맨 등

💬 To Reviewers

• appspec.yml 파일 수정했습니다.
  ApplicationStart라는 수명 주기에 세 가지 스크립트를 차례로 실행시키도록 했습니다.

• 배포 스크립트를 추가했습니다

1. run_new_was.sh
   -> 새로운 WAS를 띄우는 스크립트

# run_new_was.sh

#!/bin/bash

CURRENT_PORT=$(cat /home/ubuntu/service_url.inc | grep -Po '[0-9]+' | tail -1)
TARGET_PORT=0

echo "> Current port of running WAS is ${CURRENT_PORT}."

if [ ${CURRENT_PORT} -eq 8081 ]; then
  TARGET_PORT=8082
elif [ ${CURRENT_PORT} -eq 8082 ]; then
  TARGET_PORT=8081
else
  echo "> No WAS is connected to nginx"
fi

TARGET_PID=$(lsof -Fp -i TCP:${TARGET_PORT} | grep -Po 'p[0-9]+' | grep -Po '[0-9]+')

if [ ! -z ${TARGET_PID} ]; then
  echo "> Kill WAS running at ${TARGET_PORT}."
  sudo kill ${TARGET_PID}
fi

nohup java -jar \
        -Dserver.port=${TARGET_PORT} \
        -Dspring.config.location=/home/ubuntu/app/application.yml \
        /home/ubuntu/app/build/libs/* > /home/ubuntu/nohup.out 2>&1 &
echo "> Now new WAS runs at ${TARGET_PORT}."
sleep 10s
exit 0

2. health_check.sh
   -> 새로 띄운 WAS가 완전히 실행되기까지 health check 하는 스크립트

# health_check.sh

#!/bin/bash

# Crawl current connected port of WAS
CURRENT_PORT=$(cat /home/ubuntu/service_url.inc | grep -Po '[0-9]+' | tail -1)
TARGET_PORT=0

# Toggle port Number
if [ ${CURRENT_PORT} -eq 8081 ]; then
    TARGET_PORT=8082
elif [ ${CURRENT_PORT} -eq 8082 ]; then
    TARGET_PORT=8081
else
    echo "> No WAS is connected to nginx"
    exit 1
fi


echo "> Start health check of WAS at 'http://127.0.0.1:${TARGET_PORT}' ..."

for RETRY_COUNT in 1 2 3 4 5 6 7 8 9 10
do
    echo "> #${RETRY_COUNT} trying..."
    RESPONSE_CODE=$(curl -s -o /dev/null -w "%{http_code}"  http://127.0.0.1:${TARGET_PORT}/health)

    if [ ${RESPONSE_CODE} -eq 200 ]; then
        echo "> New WAS successfully running"
        exit 0
    elif [ ${RETRY_COUNT} -eq 10 ]; then
        echo "> Health check failed."
        exit 1
    fi
    sleep 10
done

3. switch.sh
   -> nginx 리로드를 통해 서비스하는 포트를 스위칭하는 스크립트

CURRENT_PORT=$(cat /home/ubuntu/service_url.inc  | grep -Po '[0-9]+' | tail -1)
TARGET_PORT=0

echo "> Nginx currently proxies to ${CURRENT_PORT}."

# Toggle port number
if [ ${CURRENT_PORT} -eq 8081 ]; then
    TARGET_PORT=8082
elif [ ${CURRENT_PORT} -eq 8082 ]; then
    TARGET_PORT=8081
else
    echo "> No WAS is connected to nginx"
    exit 1
fi

# Change proxying port into target port
echo "set \$service_url http://127.0.0.1:${TARGET_PORT};" | tee /home/ubuntu/service_url.inc

echo "> Now Nginx proxies to ${TARGET_PORT}."

# Reload nginx
sudo service nginx reload

echo "> Nginx reloaded."

🔗 Reference

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