使用letsencrypt生成免费https证书

环境：
操作系统：ubuntu 18.04
letsencrypt下载地址： https://github.com/letsencrypt/letsencrypt.git
nginx：nginx/1.14.0 (Ubuntu)

早期直接使用 ./letsencrypt-auto 命令可以生成，现在已经不行了，会提示

Skipping bootstrap because certbot-auto is deprecated on this system.
Your system is not supported by certbot-auto anymore.
Certbot cannot be installed.
Please visit https://certbot.eff.org/ to check for other alternatives.

原因需要安装 snap

操作过程(具体先不注释了)：
详见请参考： https://certbot.eff.org/lets-encrypt/ubuntubionic-nginx

apt update
apt install snapd -y

ln -s /snap/bin/certbot /usr/bin/certbot
apt install certbot -y
certbot --nginx

生成证书：

certbot --nginx --email hello@youdomain.com -d www.yourdomain.com
certbot --nginx --register-unsafely-without-email d-h5gateway.lingluex.com