CentOS7部署nginx并完成系统平滑升级

    1、添加YUM仓库
    [root@localhost ~]# ls /etc/yum.repos.d/
    [root@localhost ~]# rm -rf /etc/yum.repos.d/*
    [root@localhost ~]# ls /etc/yum.repos.d/
    [root@localhost ~]# mount /dev/cdrom /mnt
    [root@localhost ~]# yum-config-manager --add file:///mnt
    [root@localhost ~]# vim /etc/yum.repos.d/mnt.repo 
    ...	
    	gpgcheck=0
    ...
    [root@localhost ~]# yum clean all
    [root@localhost ~]# yum repolist
    
    2、安装Nginx
    [root@localhost ~]# tar xf lnmp_soft.tar.gz
    [root@localhost ~]# cd lnmp_soft/
    [root@localhost lnmp_soft]# tar xf