Let's Encrypt: 为CentOS/RHEL 7下的nginx安装https支持-具体案例

环境说明:

centos 7
nginx 1.10.2

前期准备

软件安装

yum install -y epel-release
yum install -y certbot

创建目录及链接

方法1：在网站根目录下创建一个.well-known的目录
方法2：
mkdir -p /usr/local/nginx/cert/.well-known
ln -s /usr/local/nginx/cert/.well-known /data/www/example.com/.well-known
ln -s /usr/local/nginx/cert/.well-known /data/www/test.example.com/.well-known

命令执行

certbot certonly --webroot -w /usr/local/nginx/cert -d example.com -d test.example.com

根据提示进行操作，一般可以正常生产证书文件。
证书文件的目录存放在: '/etc/letsencrypt/live/example.com/'
会有4个文件:
cert.pem
chain.pem
fullchain.pem
privkey.pem

特别要注意，这条命令只会将生成的证书放在这个目录，不会有一个/etc/letsencrypt/live/test.example.com/目录，test.example.com的证书和example.com的证书放在一起了，具体看后面的nginx配置。

nginx配置

server {
listen  443 ssl http2;
server_name example.com;
index index.html index.htm index.php;
root  /data/www/example.com;

ssl_certificate       /etc/letsencrypt/live/example.com/fullchain.pem;
ssl_certificate_key   /etc/letsencrypt/live/example.com/privkey.pem;

ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_session_cache shared:SSL:10m;

access_log  off;
}

server {
listen  443 ssl http2;
server_name test.example.com;
index index.html index.htm index.php;
root  /data/www/test.example.com;

ssl_certificate       /etc/letsencrypt/live/example.com/fullchain.pem;
ssl_certificate_key   /etc/letsencrypt/live/example.com/privkey.pem;

ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_session_cache shared:SSL:10m;

access_log  off;
}

定期更新

crontab -e # 新增如下定时任务
10 6 * * *  /bin/certbot renew --quiet &>/dev/null

Let's Encrypt 的证书有效期为90天，如果证书的有效期大于30天，则上面命令不会真的去更新证书的。

https测试