1) 卸载nginx
[root@locahost /]# yum remove nginx
2) 查看nginx是否还存在
[root@localhost /]# which nginx
3)重新安装 Nginx
[root@localhost /]# yum install nginx
4)启动 Nginx
[root@localhost /]# yum start nginx
5)设置自动开机启动 Nginx
[root@localhost /]# yum enable nginx