1. 安装git, 已安装可忽略

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    apt update
    apt -y install git

  2. clone Let’s Encrypt 源码

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    git clone https://github.com/letsencrypt/letsencrypt

  1. 关闭nginx

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    service nginx stop

  2. 进入letsencrypt目录

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    cd letsencrypt

  3. 运行Standalone

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    ./letsencrypt-auto certonly --standalone

  4. 如果出现报错:

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    OSError: Command /opt/eff.org/certbot/venv/bin/python2.7 - setuptools pkg_resources pip wheel failed with error code 2

    执行下面命令:

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    sudo apt-get install letsencryp
    apt-get purge python-virtualenv python3-virtualenv virtualenv
    pip install virtualenv

    然后重新执行第五步.

  5. 然后会让你输入各种信息, 反正基本上选择yes什么的, 下面我贴上我申请时的终端信息

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    service nginx stop #停止nginx
    cd letsencrypt/ #进入letsencrypt文件夹
    ./letsencrypt-auto certonly --standalone #生成证书
    Saving debug log to /var/log/letsencrypt/letsencrypt.log
    Enter email address (used for urgent renewal and security notices) (Enter 'c' to
    cancel): mail@yuxiang.ren #输入邮箱

    -------------------------------------------------------------------------------
    Please read the Terms of Service at
    https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf. You must agree
    in order to register with the ACME server at
    https://acme-v01.api.letsencrypt.org/directory
    -------------------------------------------------------------------------------
    (A)gree/(C)ancel: A #同意

    -------------------------------------------------------------------------------
    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 EFF and
    our work to encrypt the web, protect its users and defend digital rights.
    -------------------------------------------------------------------------------
    (Y)es/(N)o: Y #是
    Please enter in your domain name(s) (comma and/or space separated)  (Enter 'c'
    to cancel): baixiaotu.cc #输入域名 多域名用空格分开      
    Obtaining a new certificate
    Performing the following challenges:
    tls-sni-01 challenge for baixiaotu.cc
    Waiting for verification...
    Cleaning up challenges

  6. 如果看到这样的信息表示生成成功

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    IMPORTANT NOTES:
     - Congratulations! Your certificate and chain have been saved at:
       /etc/letsencrypt/live/baixiaotu.cc/fullchain.pem #证书目录
       Your key file has been saved at:
       /etc/letsencrypt/live/baixiaotu.cc/privkey.pem #私钥目录
       Your cert will expire on 2017-11-25. To obtain a new or tweaked
       version of this certificate in the future, simply run
       letsencrypt-auto again. To non-interactively renew *all* of your
       certificates, run "letsencrypt-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

  7. 证书文件保存在/etc/letsencrypt/live/所对应的域名文件夹下

    • fullchain.pem 为证书文件
    • privkey.pem 为私钥

  8. 然后在nging配置文件里配置一下

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    server {
    	listen 443;
        server_name baixiaotu.cc;
        ssl     on;
        ssl_certificate     /etc/letsencrypt/live/baixiaotu.cc/fullchain.pem; #证书
        ssl_certificate_key /etc/letsencrypt/live/baixiaotu.cc/privkey.pem;#私钥
    	root /var/www/baixiaotu.cc/;
    }

  9. 把80端口重定向

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    server {
     	listen 80;
    	server_name baixiaotu.cc *.baixiaotu.cc;
    	#rewrite ^(.*)$ https://$host$1$ permanent;
    	rewrite ^(.*)$ https://baixiaotu.cc permanent;
    }

  10. 开启nginx

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    service nginx start