提示报错信息：
Could not retrieve mirrorlisthttp://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was
14: PYCURL ERROR 6 - "Couldn't resolvehost 'mirrorlist.centos.org'"
Could not retrieve mirrorlisthttp://mirrorlist.centos.org/?release=6&arch=x86_64&repo=extras errorwas
14: PYCURL ERROR 6 - "Couldn't resolvehost 'mirrorlist.centos.org'"
Could not retrieve mirrorlisthttp://mirrorlist.centos.org/?release=6&arch=x86_64&repo=updates errorwas
14: PYCURL ERROR 6 - "Couldn't resolvehost 'mirrorlist.centos.org'"
http://mirrors.163.com/centos/6.2/os/x86_64/repodata/repomd.xml:[Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.163.com'"
Trying other mirror.
Error: Cannot retrieve repository metadata(repomd.xml) for repository: base. Please verify its path and try again
[root@hbase01-222 ~]# service iptables stop
[root@hbase01-222 ~]# nslookup mirrorlist.centos.org
;; connection timed out; no servers couldbe reached
解决办法：
修改一下dns，找到/etc/sysconfig/network-scripts/ifcfg-eno33（后面的数字是随机产生的）
将ONBOOT=no改成yes
然后重启网络 service network restart
参考：https://yq.aliyun.com/ziliao/33477