1、安装Let’s Encrypt证书

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

cd letsencrypt

./letsencrypt-auto certonly --standalone --email kf@kaifashuo.com -d kaifashuo.com -d kaifashuo.com

2、更新Let’s Encrypt证书

./letsencrypt-auto certonly --renew-by-default --email kf@kaifashuo.com -d kaifashuo.com -d kaifashuo.com