# 도메인에 대한 SSL 인증서 발급
root@secu-VirtualBox:~# certbot certonly --standalone -d [도메인명]
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator standalone, Installer None
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for [도메인명]
Waiting for verification...
Cleaning up challenges

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/[도메인명]//fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/[도메인명]/privkey.pem
   Your cert will expire on 2021-07-17. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot
   again. To non-interactively renew *all* of your certificates, run
   "certbot renew"
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le