安装好centos7后，将centos开通上网权限
1、将nginx加入yum
# rpm -ivh https://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm# r
阅读背景：
centos7用yum安装nginx
来源：互联网
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