can’t update yum

can’t update yum

I do this command but it can’t run: yum update

Code:

[root@server ~]# yum update
Loaded plugins: fastestmirror, refresh-packagekit
Loading mirror speeds from cached hostfile
 * base: centos.digitalcompass.net
 * extras: centos.mbni.med.umich.edu
 * updates: centos.digitalcompass.net
http://centos.digitalcompass.net/centos/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.digitalcompass.net'"
Trying other mirror.
http://centos.eecs.wsu.edu/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.eecs.wsu.edu'"
Trying other mirror.
http://centos.mbni.med.umich.edu/mirror/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mbni.med.umich.edu'"
Trying other mirror.
http://centos.mirror.constant.com/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirror.constant.com'"
Trying other mirror.
http://centos.mirror.nac.net/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirror.nac.net'"
Trying other mirror.
http://centos.mirrorcatalogs.com/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirrorcatalogs.com'"
Trying other mirror.
http://centos.netnitco.net/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.netnitco.net'"
Trying other mirror.
http://dallas.tx.mirror.xygenhosting.com/CentOS/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'dallas.tx.mirror.xygenhosting.com'"
Trying other mirror.
http://dist1.800hosting.com/centos/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'dist1.800hosting.com'"
Trying other mirror.
http://lug.mtu.edu/centos/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'lug.mtu.edu'"
Trying other mirror.
http://mirror.fdcservers.net/centos/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.fdcservers.net'"
Trying other mirror.
http://mirror.net.cen.ct.gov/centos/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.net.cen.ct.gov'"
Trying other mirror.
http://mirror.nwresd.org/pub/centos/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.nwresd.org'"
Trying other mirror.
http://mirror.pac-12.org/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.pac-12.org'"
Trying other mirror.
http://mirror.steadfast.net/centos/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.steadfast.net'"
Trying other mirror.
http://mirrors.adams.net/centos/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.adams.net'"
Trying other mirror.
http://mirrors.arsc.edu/centos/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.arsc.edu'"
Trying other mirror.
http://mirrors.kernel.org/centos/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.kernel.org'"
Trying other mirror.
http://mirrors.serveraxis.net/centos/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.serveraxis.net'"
Trying other mirror.
ftp://mirror.nandomedia.com/pub/CentOS/6.3/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.nandomedia.com'"
Trying other mirror.
http://centos.mbni.med.umich.edu/mirror/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mbni.med.umich.edu'"
Trying other mirror.
http://centos.mirror.facebook.net/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirror.facebook.net'"
Trying other mirror.
http://centos.mirror.nac.net/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirror.nac.net'"
Trying other mirror.
http://centos.mirror.netriplex.com/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirror.netriplex.com'"
Trying other mirror.
http://centos.mirror.sea.rackd.net/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirror.sea.rackd.net'"
Trying other mirror.
http://centos.mirrors.hoobly.com/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirrors.hoobly.com'"
Trying other mirror.
http://centos.vipernetworksystems.com/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.vipernetworksystems.com'"
Trying other mirror.
http://mirror.fdcservers.net/centos/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.fdcservers.net'"
Trying other mirror.
http://mirror.flhsi.com/centos/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.flhsi.com'"
Trying other mirror.
http://mirror.linux.duke.edu/pub/centos/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.linux.duke.edu'"
Trying other mirror.
http://mirror.net.cen.ct.gov/centos/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.net.cen.ct.gov'"
Trying other mirror.
http://mirror.sanctuaryhost.com/centos/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.sanctuaryhost.com'"
Trying other mirror.
http://mirror.symnds.com/CentOS/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.symnds.com'"
Trying other mirror.
http://mirror.team-cymru.org/CentOS/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.team-cymru.org'"
Trying other mirror.
http://mirror.thelinuxfix.com/CentOS/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.thelinuxfix.com'"
Trying other mirror.
http://mirror.trouble-free.net/centos/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.trouble-free.net'"
Trying other mirror.
http://mirror.ubiquityservers.com/centos/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.ubiquityservers.com'"
Trying other mirror.
http://mirrors.einstein.yu.edu/centos/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.einstein.yu.edu'"
Trying other mirror.
http://yum.singlehop.com/CentOS/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'yum.singlehop.com'"
Trying other mirror.
ftp://mirror.nandomedia.com/pub/CentOS/6.3/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.nandomedia.com'"
Trying other mirror.
http://centos.digitalcompass.net/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.digitalcompass.net'"
Trying other mirror.
http://centos.mirror.balt.rackd.net/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirror.balt.rackd.net'"
Trying other mirror.
http://centos.mirror.freedomvoice.com/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirror.freedomvoice.com'"
Trying other mirror.
http://centos.mirror.netriplex.com/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirror.netriplex.com'"
Trying other mirror.
http://dallas.tx.mirror.xygenhosting.com/CentOS/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'dallas.tx.mirror.xygenhosting.com'"
Trying other mirror.
http://ftp.linux.ncsu.edu/pub/CentOS/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'ftp.linux.ncsu.edu'"
Trying other mirror.
http://ftp.osuosl.org/pub/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'ftp.osuosl.org'"
Trying other mirror.
http://mirror.5ninesolutions.com/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.5ninesolutions.com'"
Trying other mirror.
http://mirror.anl.gov/pub/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.anl.gov'"
Trying other mirror.
http://mirror.dattobackup.com/CentOS/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.dattobackup.com'"
Trying other mirror.
http://mirror.flhsi.com/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.flhsi.com'"
Trying other mirror.
http://mirror.hmc.edu/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.hmc.edu'"
Trying other mirror.
http://mirror.liberty.edu/pub/CentOS/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.liberty.edu'"
Trying other mirror.
http://mirror.sanctuaryhost.com/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.sanctuaryhost.com'"
Trying other mirror.
http://mirror.spro.net/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.spro.net'"
Trying other mirror.
http://mirror.unl.edu/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.unl.edu'"
Trying other mirror.
http://mirror.us.leaseweb.net/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.us.leaseweb.net'"
Trying other mirror.
http://mirror.wiredtree.com/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.wiredtree.com'"
Trying other mirror.
http://mirrors.adams.net/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.adams.net'"
Trying other mirror.
http://mirrors.rit.edu/centos/6.3/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.rit.edu'"
Trying other mirror.
http://vzdownload.swsoft.com/ez/packages/centos/6/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'vzdownload.swsoft.com'"
Trying other mirror.
http://vzdownload.swsoft.com/ez/packages/centos/6/x86_64/updates/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'vzdownload.swsoft.com'"
Trying other mirror.
Setting up Update Process
No Packages marked for Update


Please help me fix it thanks

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