由于centos源内无nginx，故手动添加源

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sudo rpm -Uvh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm

2、安装Nginx

通过yum search nginx看看是否已经添加源成功。如果成功则执行下列命令安装Nginx。

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sudo yum install -y nginx

3、启动Nginx并设置开机自动运行

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sudo systemctl start nginx.service
sudo systemctl enable nginx.service