安装cerbot
apt install certbot
执行 you.cn 换成对应的域名
certbot certonly -d *.you.cn --manual --preferred-challenges dns --server https://acme-v02.api.letsencrypt.org/directory
接着可以看到下面界面结果：
Dependency Installed:
dwz.x86_64 0:0.11-3.el7 perl-srpm-macros.noarch 0:1-8.el7 tcl.x86_64 1:8.5.13-8.el7 tix.x86_64 1:8.4.3-12.el7 tk.x86_64 1:8.5.13-6.el7 tkinter.x86_64 0:2.7.5-69.el7_5
Complete!
Creating virtual environment...
Installing Python packages...
Installation succeeded.
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator manual, Installer None
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): 123@163.com
接下来需要输入些指令
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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
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Would you be willing 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.
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(Y)es/(N)o: N
Obtaining a new certificate
Performing the following challenges:
dns-01 challenge for kuaichuangkeji.com
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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?
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(Y)es/(N)o: Y
这里有几个需交互的提示
是否同意 Let's Encrypt 协议要求=>需要同意
是否分享你的邮箱
询问是否对域名和机器（IP）进行绑定=>需要同意
需要注意的地方：
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Please deploy a DNS TXT record under the name
_acme-challenge.you.cn with the following value:
RYtObhDvEcXewZckknNQkBKIkvwIlbb4PNRel74LNwU
Before continuing, verify the record is deployed.
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Press Enter to Continue
Waiting for verification...
Cleaning up challenges
要求配置 DNS TXT 记录，从而校验域名所有权，也就是判断证书申请者是否有域名的所有权。
上面输出要求给 http://_acme-challenge.you.cn 配置一条 TXT 记录，在没有确认 TXT 记录生效之前不要回车执行。
我用的是阿里云的域名服务器，控制台具体操作如下图所示：
服务器域名DNS 配置记录
确认生效后，回车执行，输出如下
IMPORTANT NOTES:
- Congratulations! Your certificate and chain have been saved at:
/etc/letsencrypt/live/you.cn/fullchain.pem
Your key file has been saved at:
/etc/letsencrypt/live/you.cn/privkey.pem
Your cert will expire on 2019-02-27. 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"
- 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
看到这个界面内容的话，恭喜你，证书安装成功了。
证书续签
注:证书在到期前30天才会续签成功,但为了确保证书在运行过程中不过期,官方建议每天自动执行续签两次;
使用crontab自动续期
crontab -e // 编辑定时任务
0 */12 * * * certbot renew --quiet "nginx -s reload"
需要注意nginx重启命令，需要根据自己服务器的重启命令重启即可；这里建议使用reload，不推荐使用restart，因为这样万一配错了，也不会影响服务器其他项目的运行
证书保存的路径[配置nginx需要用到的
/etc/letsencrypt/live/you.cn/fullchain.pem
/etc/letsencrypt/live/you.cn/privkey.pem
nginx 开启 https
server {
listen 443 ssl;
server_name you.cn;
root /home/www/you;
index index.html index.htm index.php;
ssl on;
ssl_certificate /etc/letsencrypt/live/you.cn/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/you.cn/privkey.pem;
...
}
添加 HTTP 自动跳转到 HTTPS：
server {
listen 80;
server_name you.cn;
location / {
rewrite ^(.*)$ https://$host$1 permanent;
}
}