Nginx安装错误：No package nginx avail

备份repo(防止修改错误还能还原)

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

下载新的CentOS-Base.repo 到/etc/yum.repos.d/

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

分别运行下面命令

yum makecache
yum install epel-release
yum install nginx

默认首页：vim /usr/ share/nginx/ html/index.html
配置：/etc/ngnix/ngnix.conf
版本：ngnix -v