Ubuntu 14.04 SSL免费证书

不说前提不废话，开始

1. lets encrypt 官网：https://letsencrypt.org/

2. 下载letsencrypt

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

3. 关闭nginx，一定要关闭nginx

4. 生成证书

$ ./letsencrypt-auto -d simiie.com auth
Requesting root privileges to run certbot...
  /home/bolomma/.local/share/letsencrypt/bin/letsencrypt -d simiie.com auth
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Failed to find executable apache2ctl in PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

How would you like to authenticate with the ACME CA?
-------------------------------------------------------------------------------
1: Spin up a temporary webserver (standalone)
2: Place files in webroot directory (webroot)
-------------------------------------------------------------------------------
Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 1

这里我选择临时：1

5. 接下来会在/etc/letsencrypt下生成很多目录，进入live目录，有对应的4个证书文件

6. fullchain.pem是公钥，privkey.pem是私钥，配置进nginx就可以了

https://linux.cn/article-6565-1.html