# snap
yum -y install epel-release  #安装依赖
yum -y install snapd    #安装snap
systemctl enable --now snapd.socket #启动snap通信套接字
ln -s /var/lib/snapd/snap /snap #创建如下软连接，为了启用classic snap的支持

systemctl restart snapd.service
sudo snap install --classic certbot
sudo ln -s /snap/bin/certbot /usr/bin/certbot
sudo certbot --nginx

# apply only
sudo certbot certonly --nginx
# renew
sudo certbot renew --dry-run