Installing software using Yum Error: "Pycurl error 6

Loaded Plugins:fastestmirror
Determining fastest Mirrors
Could not retrieve mirrorlist Http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was
14:pycurl ERROR 6-"couldn ' t resolve Host ' mirrorlist.centos.org '"
Could not get Metalink https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=x86_64 error was
14:pycurl ERROR 6-"couldn ' t resolve Host ' mirrors.fedoraproject.org '"
Could not retrieve mirrorlist Http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=extras error was
14:pycurl ERROR 6-"couldn ' t resolve Host ' mirrorlist.centos.org '"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=updates error was
14:pycurl ERROR 6-"couldn ' t resolve Host ' mirrorlist.centos.org '"
* base:centos.ustc.edu.cn
* EPEL:FTP.CUHK.EDU.HK
* extras:centos.ustc.edu.cn
* updates:centos.cs.nctu.edu.tw
Http://dl.atrpms.net/el6-x86_64/atrpms/stable/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Dl.atrpms.net ' "
Trying other mirror.
Http://centos.ustc.edu.cn/centos/6.6/os/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Centos.ustc.edu.cn ' "
Trying other mirror.
Http://ftp.sjtu.edu.cn/centos/6.6/os/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' FTP . sjtu.edu.cn ' "
Trying other mirror.
Http://mirror.bit.edu.cn/centos/6.6/os/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Mirror.bit.edu.cn ' "
Trying other mirror.
Http://mirrors.cqu.edu.cn/CentOS/6.6/os/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Mirrors.cqu.edu.cn ' "
Trying other mirror.
Http://mirrors.hust.edu.cn/centos/6.6/os/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Mirrors.hust.edu.cn ' "
Trying other mirror.
Http://mirrors.neusoft.edu.cn/centos/6.6/os/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' mirrors.neusoft.edu.cn ' "
Trying other mirror.
Http://mirrors.pubyun.com/centos/6.6/os/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Mirrors.pubyun.com ' "
Trying other mirror.
Http://mirrors.sina.cn/centos/6.6/os/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Mirrors.sina.cn ' "
Trying other mirror.
Http://mirrors.yun-idc.com/centos/6.6/os/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Mirrors.yun-idc.com ' "
Trying other mirror.
Http://mirrors.zju.edu.cn/centos/6.6/os/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Mirrors.zju.edu.cn ' "
Trying other mirror.
Http://centos.ustc.edu.cn/centos/6.6/extras/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' centos.ustc.edu.cn ' "
Trying other mirror.
Http://ftp.sjtu.edu.cn/centos/6.6/extras/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Ftp.sjtu.edu.cn ' "
Trying other mirror.
Http://mirror.bit.edu.cn/centos/6.6/extras/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' mirror.bit.edu.cn ' "
Trying other mirror.
Http://mirrors.163.com/centos/6.6/extras/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Mirrors.163.com ' "
Trying other mirror.
Http://mirrors.btte.net/centos/6.6/extras/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' Mirrors.btte.net ' "
Trying other mirror.
Http://mirrors.cqu.edu.cn/CentOS/6.6/extras/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' mirrors.cqu.edu.cn ' "
Trying other mirror.
Http://mirrors.hust.edu.cn/centos/6.6/extras/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' mirrors.hust.edu.cn ' "
Trying other mirror.
Http://mirrors.neusoft.edu.cn/centos/6.6/extras/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t Resolve host ' mirrors.neusoft.edu.cn ' "
Trying other mirror.
Http://mirrors.opencas.cn/centos/6.6/extras/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' mirrors.opencas.cn ' "
Trying other mirror.
Http://mirrors.pubyun.com/centos/6.6/extras/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' mirrors.pubyun.com ' "
Trying other mirror.
Http://centos.cs.nctu.edu.tw/6.6/updates/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve host ' Centos.cs.nctu.edu.tw ' "
Trying other mirror.
Http://centos.ustc.edu.cn/centos/6.6/updates/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' centos.ustc.edu.cn ' "
Trying other mirror.
Http://ftp.ksu.edu.tw/pub/CentOS/6.6/updates/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' ftp.ksu.edu.tw ' "
Trying other mirror.
Http://mirror.bit.edu.cn/centos/6.6/updates/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' mirror.bit.edu.cn ' "
Trying other mirror.
Http://mirror.neu.edu.cn/centos/6.6/updates/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' mirror.neu.edu.cn ' "
Trying other mirror.
Http://mirrors.hust.edu.cn/centos/6.6/updates/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t Resolve host ' mirrors.hust.edu.cn ' "
Trying other mirror.
Http://mirrors.neusoft.edu.cn/centos/6.6/updates/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t Resolve host ' mirrors.neusoft.edu.cn ' "
Trying other mirror.
Http://mirrors.nwsuaf.edu.cn/centos/6.6/updates/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t Resolve host ' mirrors.nwsuaf.edu.cn ' "
Trying other mirror.
Http://mirrors.sina.cn/centos/6.6/updates/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' mirrors.sina.cn ' "
Trying other mirror.
Http://mirrors.zju.edu.cn/centos/6.6/updates/x86_64/repodata/repomd.xml: [Errno] Pycurl ERROR 6-"couldn ' t resolve Host ' mirrors.zju.edu.cn ' "
Trying other mirror.
Setting up Install Process
Resolving Dependencies
--Running Transaction check
---> Package net-snmp.x86_64 1:5.5-50.el6_6.1 'll be installed
--Processing Dependency:net-snmp-libs = 1:5.5-50.el6_6.1 for package:1:net-snmp-5.5-50.el6_6.1.x86_64
--Running Transaction check
---> Package net-snmp-libs.x86_64 1:5.5-49.el6_5.2 'll be updated
---> Package net-snmp-libs.x86_64 1:5.5-50.el6_6.1 would be a update
--Finished Dependency Resolution

Dependencies resolved

This article is from the "Breght Moon" blog, make sure to keep this source http://liqingbiao.blog.51cto.com/3044896/1688025

Installing software using Yum Error: "Pycurl error 6