使用cron定时更新letsencrypt证书

部署 OpenConnect VPN 时,VPN的证书是由 Let’s Encrypt 签发的,这个免费签发的证书有效期3个月,所以需要设置一个定时更新证书脚本:

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/vpn.huatai.me/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/vpn.huatai.me/privkey.pem
   Your cert will expire on 2022-05-04. 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"

根据提示可知,需要每3个月重新执行一次 certbot renew 命令来更新证书,所以最简单方式是是使用 Cron定时运行 定时执行脚本