https lets-encrypt renew

./certbot-auto renew

출처 : https://swiftcoding.org/lets-encrypt-renew

에러 발생

Attempting to renew cert (dd.kro.kr) from /etc/letsencrypt/renewal/dd.kro.kr.conf
produced an unexpected error: Problem binding to port 80: 
Could not bind to IPv4 or IPv6.. Skipping.
All renewal attempts failed. The following certs could not be renewed:
  /etc/letsencrypt/live/dd.kro.kr/fullchain.pem (failure)​

pm2로 서버가 동작하고 있어서 안되는 에러였다. 서버 정지하고 다시하니 됨