新机器安装出现这个什么情况？

1. Last login: Thu Oct 19 19:55:03 2017 from 121.232.108.146
   
2. [root@localhost ~]# yum install -y wget && wget -O install.sh http://download.bt.cn/install/install.sh && sh install.sh
   
3. Loaded plugins: fastestmirror
   
4. Setting up Install Process
   
5. Loading mirror speeds from cached hostfile
   
6. Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os&infra=stock error was
   
7. 14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"
   
8. Error: Cannot find a valid baseurl for repo: base
   
9. [root@localhost ~]#
   

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DNS没设置好导致无法正常连接yum源