1. 下载iso。
2. sudo mkdir /mnt/iso
3. mount -t iso9660 -o loop CentOS-6.2-x86_64-bin-DVD1.iso /mnt/iso
4. 备份/etc/yum.repos.d/CentOS-Media.repo
cp /etc/yum.repos.d/CentOS-Media.repo /etc/yum.repos.d/CentOS-Media.repo.bak
5.
打开/etc/yum.repos.d/CentOS-Media.repo
有个本地路径列表在列表的最后加上
file:///mnt/iso/
然后把下面的gpgcheck=1改为=0(解决：Error: Missing Dependency: kernel-ib is needed by package srptools)
6. # yum --disablerepo=* --enablerepo=c6-media upgrade