[CentOS] yum 실행이 안되거나 couldn't resolve host '~~~' 의 에러가 발생하였을 경우 해결 방법

baseurl 을 아래와 같이 변경해준다.

(*)기존 mirrorlist 와 baseurl을 주석처리 후 추가

[base]

name=CentOS-$releasever - Base
baseurl=http://ftp.daum.net/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://ftp.daum.net/centos/RPM-GPG-KEY-CentOS-5

#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=http://ftp.daum.net/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://ftp.daum.net/centos/RPM-GPG-KEY-CentOS-5

#additional packages that may be useful

[extras]
name=CentOS-$releasever - Extras
baseurl=http://ftp.daum.net/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://ftp.daum.net/centos/RPM-GPG-KEY-CentOS-5

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://ftp.daum.net/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://ftp.daum.net/centos/RPM-GPG-KEY-CentOS-5

#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
baseurl=http://ftp.daum.net/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://ftp.daum.net/centos/RPM-GPG-KEY-CentOS-5