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_ [OS] RHELのDVDISOからyumを使うとき

mount -t iso9660 -o loop /home/hoge/backup/RHEL_5.3_i386_DVD.iso /mnt

rpm --import /mnt/RPM-GPG-KEY-redhat-release

vi /etc/yum.repos.d/DVD.repo
[DVD]
enabled = 1
name = DVD
baseurl = file:///mnt/Server/
gpgcheck = 1

後はいつも通りに。