[root@home ~]# yum update
Loading “security” plugin
YumRepo Warning: not using ftp, http[s], or file for repos, skipping – 5.4 is not a valid release or hasnt been released yet
removing mirrorlist with no valid mirrors: //var/cache/yum/base/mirrorlist.txt
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again
=> 초기 설치시 ftp, http 가 설치 안된 상태 CD 넣고 프로그램 추가