certbot申请通配符域名证书

certbot官网

下载certbot

# 下载certbot-auto
wget -c https://dl.eff.org/certbot-auto -P /usr/local/bin
# 设置可执行权限
chmod +x /usr/local/bin/certbot-auto
# 查看版本，第一次运行certbot-auto会安装依赖
certbot-auto --version

申请证书

certbot-auto certonly  -d *.example.com --manual --preferred-challenges dns --server https://acme-v02.api.letsencrypt.org/directory 

1. certonly 安装模式
2. -d 申请证书的域名，如果是通配符域名输入 *.example.com
3. --manual 手动安装插件
4. --preferred-challenges dns 使用 DNS 方式校验域名所有权
5. --server，Let's Encrypt ACME v2 版本使用的服务器不同于 v1 版本，需要显示指定

# 输入电子邮箱，用于续费和安全通知
Enter email address (used for urgent renewal and security notices)
 (Enter 'c' to cancel): [email protected]

# 服务条款，A：同意，C：取消
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Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must
agree in order to register with the ACME server at
https://acme-v02.api.letsencrypt.org/directory
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(A)gree/(C)ancel: A

# 是否订阅相关的邮件
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Would you be willing, once your first certificate is successfully issued, to share your email address with the Electronic Frontier Foundation, a founding partner of the Let's Encrypt project and the non-profit organization that
develops Certbot? We'd like to send you email about our work encrypting the web,EFF news, campaigns, and ways to support digital freedom.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(Y)es/(N)o: N

# IP绑定
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NOTE: The IP of this machine will be publicly logged as having requested this
certificate. If you're running certbot in manual mode on a machine that is not
your server, please ensure you're okay with that.

Are you OK with your IP being logged?
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(Y)es/(N)o: Y

配置DNS TXT记录

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Please deploy a DNS TXT record under the name
_acme-challenge.example.com with the following value:

pzBqECpVNkjt8gx76qVAYevMFg6n_8dfq-Xqr2f9dI8

Before continuing, verify the record is deployed.
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Press Enter to Continue

1. 到购买域名的服务商控制台解析域名
2. 添加一条TXT记录
3. 主机记录：_acme-challenge.example.com
4. 记录值：pzBqECpVNkjt8gx76qVAYevMFg6n_8dfq-Xqr2f9dI8
5. 记录生效后，回车

Waiting for verification...
Cleaning up challenges

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/example.com/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/example.com/privkey.pem
   Your cert will expire on 2020-12-21. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot-auto
   again. To non-interactively renew *all* of your certificates, run
   "certbot-auto 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

证书目录：/etc/letsencrypt/live/example.com

ls /etc/letsencrypt/live/example.com
cert.pem  chain.pem  fullchain.pem  privkey.pem  README

自动续订

• 创建续订证书脚本

  touch /usr/local/bin/sslrenew.sh
  

• 编辑脚本内容
  在sslrenew.sh文件中添加以下内容

  certbot-auto renew

• 设置脚本可执行

  chmod +x /usr/local/bin/sslrenew.sh
  

• 编辑定时任务,每月1号执行续订操作

  crontab -e
  

  添加定时逻辑

  0 0 1 * * /usr/local/bin/sslrenew.sh

• 重新加载定时任务

  service crond reload
  

• 查看定时任务列表

  crontab -l
  

配置nginx

server {
        listen       443 ssl;
        server_name  localhost;
        
        location / {
            root   html;
            index  index.html index.htm;
        }
        ssl on;
        ssl_session_timeout 5m;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
        ssl_prefer_server_ciphers on;
        ssl_certificate      /etc/letsencrypt/live/example.com/cert.pem;
        ssl_certificate_key  /etc/letsencrypt/live/example.com/privkey.pem;
}

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