1.安装nginx需要使用root用户

2.配置nginx源

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

    # 运行如下
    [root@localhost ~]# rpm -ivh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
    获取http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
    警告：/var/tmp/rpm-tmp.lI2rbS: 头V4 RSA/SHA1 Signature, 密钥 ID 7bd9bf62: NOKEY
    准备中...                          ################################# [100%]
    正在升级/安装...
       1:nginx-release-centos-7-0.el7.ngx ################################# [100%]

    # 出现如上所示，则配置成功，也可以在/etc/yum.repos.d/ 下看到多了一个nginx.repo文件

    [root@baize ~]# cd /etc/yum.repos.d/
    [root@baize yum.repos.d]# ls
    CentOS-Base.repo  CentOS-Debuginfo.repo  CentOS-Media.repo    CentOS-Vault.repo          epel.repo          nginx.repo
    CentOS-CR.repo    CentOS-fasttrack.repo  CentOS-Sources.repo  CentOS-x86_64-kernel.repo  epel-testing.repo
    [root@baize yum.repos.d]# yum install -y nginx

3.安装nginx

yum install -y nginx

4.放行80端口

    firewall-cmd --permanent --add-port=80/tcp
    firewall-cmd --permanent --add-port=443/tcp