使用yum 安装软件出现一下错误:” 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 14] 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 will 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 will be updated
---> Package net-snmp-libs.x86_64 1:5.5-50.el6_6.1 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

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