最新版 Let’s Encrypt免费证书申请步骤，保姆级教程

最近将域名迁到了google domain，就研究了一下Let’s Encrypt的域名证书配置。发现网上找到的教程在官方说明中已经废弃，所以自己写一个流程记录一下。

步骤方法官方文档见：https://eff-certbot.readthedocs.io/en/stable/install.html#installation

snapd官方文档见：https://certbot.eff.org/instructions

1. 安装snapd

• centos（这里我使用的是这个系统）

  sudo yum install snapd
  sudo systemctl enable --now snapd.socket
  sudo ln -s /var/lib/snapd/snap /snap
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• ubuntu的

  $ sudo apt update
  $ sudo apt install snapd
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测试一下：

$ sudo snap install hello-world
hello-world 6.4 from Canonical✓ installed
$ hello-world
Hello World!
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2. 使用snapd安装certbot

sudo snap install --classic certbot
sudo ln -s /snap/bin/certbot /usr/bin/certbot
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3. 生成证书（需要指定nginx）

👉 手动安装nginx

certbot certonly --nginx --nginx-ctl /usr/local/nginx/sbin/nginx --nginx-server-root /usr/local/nginx/conf
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这里的certonly就是只下载对应文件，不进行配置nginx，适用于自己配置或者更新使用。去掉则会帮你进行配置nginx（我没有试用）。

可能出现的问题：

The error was: PluginError(‘Nginx build is missing SSL module (–with-http_ssl_module).’)

提示这个错误是因为目前nginx缺少–with-http_ssl_module这个模块，我们要添加这个模块。重新编译nginx

进入nginx下载的目录

./configure --prefix=/usr/local/nginx --with-http_ssl_module

编译完成后

make

make install

/usr/local/nginx/sbin/nginx -s stop

/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf

使用 /usr/local/nginx/sbin/nginx -V 查看是否生效

[root]# /usr/local/nginx/sbin/nginx -V
nginx version: nginx/1.23.2
built by gcc 10.2.1 20200825 (Alibaba 10.2.1-3 2.32) (GCC) 
built with OpenSSL 1.1.1k  FIPS 25 Mar 2021
TLS SNI support enabled
configure arguments: --prefix=/usr/local/nginx --with-http_ssl_module
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生效，重新执行上面的命令即可。

4. 生成证书

执行上面的命令后，程序会让你确认你的邮箱和你的域名，确认完成后会将证书文件生成在指定目录中。

certbot certonly --nginx --nginx-ctl /usr/local/nginx/sbin/nginx --nginx-server-root /usr/local/nginx/conf
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Enter email address (used for urgent renewal and security notices)
 (Enter 'c' to cancel): [这里输入你的邮箱]

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Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.3-September-21-2022.pdf. You must
agree in order to register with the ACME server. Do you agree?
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(Y)es/(N)o: Y

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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.
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(Y)es/(N)o: Y [选Y 继续]
Account registered.

Which names would you like to activate HTTPS for?
We recommend selecting either all domains, or all domains in a VirtualHost/server block.
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1: whrss.com
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Select the appropriate numbers separated by commas and/or spaces, or leave input
blank to select all options shown (Enter 'c' to cancel):  [这里不需要输入，回车选所有]
Requesting a certificate for whrss.com

Successfully received certificate.
Certificate is saved at: 
# [这里告诉我们生成的文件路径和有效期]
/etc/letsencrypt/live/whrss.com/fullchain.pem
Key is saved at:         /etc/letsencrypt/live/whrss.com/privkey.pem
This certificate expires on 2023-03-02.
These files will be updated when the certificate renews.
Certbot has set up a scheduled task to automatically renew this certificate in the background.

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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
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5. Nginx.conf的配置

server{
        #监听443端口
        listen 443 ssl;
        #对应的域名，空格分隔域名就可以了
        server_name whrss.com; 
        #第一个域名的文件
        ssl_certificate /etc/letsencrypt/live/whrss.com/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/whrss.com/privkey.pem;
        # 其他配置
        ssl_session_timeout 5m;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:!MD5:!RC4:!DHE;
        ssl_prefer_server_ciphers on;
        #这是我的主页访问地址，因为使用的是静态的html网页，所以直接使用location就可以完成了。
        location / {
            root   /;
            index  /;
            proxy_pass http://127.0.0.1:9091;
            proxy_set_header Host $host:443;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Via "nginx";
        }
}
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以上！！