新安裝的CentOS，怎麼yum install都不行，都會出現下面錯誤，一直以為修改[root@localhost ~]# vim /etc/yum.repos.d/CentOS-Base.repo的問題，結果發現是DNS沒設定上去，因為安裝使用DHCP，後來才手動改網路設定，忘了補上DNS……………夠豬頭!
Total download size: 8.9 M
Is this ok [y/N]: y
Downloading Packages:
http://ftp.isu.edu.tw/pub/Linux/CentOS/5/os/i386/CentOS/libgomp-4.4.0-6.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, ' ')>
Trying other mirror.
http://ftp.isu.edu.tw/pub/Linux/CentOS/5/updates/i386/RPMS/glibc-headers-2.5-49.el5_5.4.i386.rpm: [Errno 4] IOError: <urlopen error (-3, ' ')>
Trying other mirror.
http://ftp.isu.edu.tw/pub/Linux/CentOS/5/updates/i386/RPMS/kernel-headers-2.6.18-194.8.1.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, '\xa 3')>
Trying other mirror.
http://ftp.isu.edu.tw/pub/Linux/CentOS/5/updates/i386/RPMS/glibc-devel-2.5-49.el5_5.4.i386.rpm: [Errno 4] IOError: <urlopen error (-3, '\x 9e')>
Trying other mirror.
http://ftp.isu.edu.tw/pub/Linux/CentOS/5/os/i386/CentOS/gcc-4.1.2-48.el5.i386.rpm: [Errno 4] IOError: <urlopen error (-3, '\x9 0')>
Trying other mirror.
補上DNS後可透過YUM正確安裝了
/etc/resolv.conf
nameserver 168.95.1.1
