使用yum安装pgadmin3 centos 6

我正在尝试在centos 6中安装pgadmin3。但是出现此错误。如何避免这种情况并安装pgAdmin3。

[root@localhost ~]# yum install pgadmin3
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=i386&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=i386 error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.fedoraproject.org'"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=i386&repo=extras error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"
Could not retrieve mirrorlist http://mirrorlist.repoforge.org/el6/mirrors-rpmforge error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.repoforge.org'"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=i386&repo=updates error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"
 * base: centos.aol.in
 * epel: epel.mirror.net.in
 * extras: centos.aol.in
 * rpmforge: apt.sw.be
 * updates: centos.aol.in
http://linuxdownload.adobe.com/linux/i386/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'linuxdownload.adobe.com'"
Trying other mirror.
http://linuxdownload.adobe.com/linux/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'linuxdownload.adobe.com'"
Trying other mirror.
http://centos.aol.in/6.5/os/i386/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.aol.in'"
Trying other mirror.
http://centos.excellmedia.net/6.5/os/i386/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.excellmedia.net'"
Trying other mirror.
http://centos.mirror.net.in/centos/6.5/os/i386/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'centos.mirror.net.in'"
Trying other mirror.