Nginx服务器配置Let’s Encrypt免费SSL证书

软硬件环境

• Debian 9
• Nginx由apt-get安装

步骤

安装certbot

首先启用backports仓库。将deb http://deb.debian.org/debian stretch-backports main这行加入/etc/apt/sources.list文件中。然后执行

$ sudo apt-get update
$ sudo apt-get install certbot python-certbot-nginx -t stretch-backports

安装DNS插件

如果要使用通配符证书(支持2级域名通配如*.example.com)，可以安装DNS插件

$ sudo apt-get install python3-certbot-dns-PLUGIN

这里的PLUGIN要替换为具体的插件类型，例如rfc2136

自动安装证书并启用HTTPS

$ sudo certbot

按照提示一步步来就可以了，最后看到这样的提示就说明成功了：

Congratulations! You have successfully enabled https://tagger.sibantu.com

You should test your configuration at:
https://www.ssllabs.com/ssltest/analyze.html?d=tagger.sibantu.com
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/test.example.com/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/test.example.com/privkey.pem
   Your cert will expire on 2019-06-24. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot again
   with the "certonly" option. To non-interactively renew *all* of
   your certificates, run "certbot renew"
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.
 - 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

证书的有效期是3个月，可以用certbot renew命令来更新证书。