centos2[root /etc]#yum -y install telnet-server        << 이명령어로 설치를 했는데 

Loaded plugins: fastestmirror, security

Loading mirror speeds from cached hostfile

 * base: ftp.daum.net

 * extras: ftp.daum.net

 * updates: ftp.daum.net

http://ftp.daum.net/centos/5.10/os/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://centos.mirror.cdnetworks.com/5.10/os/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://data.nicehosting.co.kr/os/CentOS/5.10/os/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://www.ftp.ne.jp/Linux/packages/CentOS/5.10/os/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.riken.jp/Linux/centos/5.10/os/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://mirror.premi.st/centos/5.10/os/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.jaist.ac.jp/pub/Linux/CentOS/5.10/os/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://mirror.fairway.ne.jp/centos/5.10/os/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.neowiz.com/centos/5.10/os/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.nara.wide.ad.jp/pub/Linux/centos/5.10/os/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.daum.net/centos/5.10/extras/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://centos.mirror.cdnetworks.com/5.10/extras/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://data.nicehosting.co.kr/os/CentOS/5.10/extras/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://www.ftp.ne.jp/Linux/packages/CentOS/5.10/extras/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.riken.jp/Linux/centos/5.10/extras/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://mirror.premi.st/centos/5.10/extras/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.jaist.ac.jp/pub/Linux/CentOS/5.10/extras/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://mirror.fairway.ne.jp/centos/5.10/extras/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.neowiz.com/centos/5.10/extras/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.iij.ad.jp/pub/linux/centos/5.10/extras/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.daum.net/centos/5.10/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://centos.mirror.cdnetworks.com/5.10/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://data.nicehosting.co.kr/os/CentOS/5.10/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://www.ftp.ne.jp/Linux/packages/CentOS/5.10/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.riken.jp/Linux/centos/5.10/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://mirror.premi.st/centos/5.10/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.jaist.ac.jp/pub/Linux/CentOS/5.10/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://mirror.fairway.ne.jp/centos/5.10/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.neowiz.com/centos/5.10/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.nara.wide.ad.jp/pub/Linux/centos/5.10/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

Setting up Install Process

Resolving Dependencies

--> Running transaction check

---> Package telnet-server.i386 1:0.17-41.el5 set to be updated

--> Finished Dependency Resolution

Dependencies Resolved

=======================================================================================

 Package                 Arch           Version                   Repository      Size

=======================================================================================

Installing:

 telnet-server           i386           1:0.17-41.el5             base            35 k

Transaction Summary

=======================================================================================

Install       1 Package(s)

Upgrade       0 Package(s)

Total download size: 35 k

Downloading Packages:

http://ftp.daum.net/centos/5.10/os/i386/CentOS/telnet-server-0.17-41.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://centos.mirror.cdnetworks.com/5.10/os/i386/CentOS/telnet-server-0.17-41.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://data.nicehosting.co.kr/os/CentOS/5.10/os/i386/CentOS/telnet-server-0.17-41.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://www.ftp.ne.jp/Linux/packages/CentOS/5.10/os/i386/CentOS/telnet-server-0.17-41.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.riken.jp/Linux/centos/5.10/os/i386/CentOS/telnet-server-0.17-41.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://mirror.premi.st/centos/5.10/os/i386/CentOS/telnet-server-0.17-41.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.jaist.ac.jp/pub/Linux/CentOS/5.10/os/i386/CentOS/telnet-server-0.17-41.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://mirror.fairway.ne.jp/centos/5.10/os/i386/CentOS/telnet-server-0.17-41.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.neowiz.com/centos/5.10/os/i386/CentOS/telnet-server-0.17-41.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

http://ftp.nara.wide.ad.jp/pub/Linux/centos/5.10/os/i386/CentOS/telnet-server-0.17-41.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>

Trying other mirror.

Error Downloading Packages:

  1:telnet-server-0.17-41.el5.i386: failure: CentOS/telnet-server-0.17-41.el5.i386.rpm from base: [Errno 256] No more mirrors to try.