之前在使用 Let’s Encrypt 申請憑證時，因為只有買一個域名，所以開了很多子域名，然後又一個一個申請，結果一堆子域名憑證資料夾。
後來查了，可以使用 `certbot certonly –standalone` 將想要一起申請 SSL 的 域名一起申請
操作如下：
[root@centos]# certbot certonly --standalone -d www.example.cc -d example.cc Saving debug log to /var/log/letsencrypt/letsencrypt.log - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - You have an existing certificate that contains a portion of the domains you requested (ref: /etc/letsencrypt/renewal/example.cc.conf) It contains these names: example.cc You requested these names for the new certificate: www.example.cc, example.cc. Do you want to expand and replace this existing certificate with the new certificate? - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (E)xpand/(C)ancel: E Renewing an existing certificate for www.example.cc and example.cc Successfully received certificate. Certificate is saved at: /etc/letsencrypt/live/example.cc/fullchain.pem Key is saved at: /etc/letsencrypt/live/example.cc/privkey.pem This certificate expires on 2025-03-26. These files will be updated when the certificate renews. Certbot has set up a scheduled task to automatically renew this certificate in the background. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 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 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
