先更新内核，然后安装nginx。启用bbr。
yum install yum-utils vim -y
vim /etc/yum.repos.d/nginx.repo
输入：
sudo yum-config-manager --enable nginx-mainline
sudo yum install nginx
systemctl enable nginx
systemctl start nginx
sudo yum -y install epel-release
yum -y install yum-plugin-copr
yum copr enable @caddy/caddy
yum -y install caddy
sudo yum -y install snapd
sudo systemctl enable –now snapd.socket
sudo snap install core;
sudo snap refresh core
reboot
systemctl enable snapd
systemctl start –now snapd.socket
ln -s /var/lib/snapd/snap /snap
snap install –classic certbot
ln -s /snap/bin/certbot /usr/bin/certbot
安装完毕后，配置nginx即可：
vim /etc/nginx/conf.d/default.conf
配置如下：
记得修改server_name为你将要申请ssl证书的域名。
nginx -s reload
certbot –nginx
firewall-cmd –permanent –add-port=443/tcp
firewall-cmd –reload
就可以实现你想要的功能了，enjoy~~~
Original: https://www.cnblogs.com/sixiweb/p/14067497.html
Author: 四喜
Title: centos7 安装 certbot 动态更新Let’s encrypt 证书实现nginx免费ssl证书
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