Add CDROM:

#virsh

attach-disk guest01 /root/disc1.iso hdc --driver file --type cdrom

--mode readonly

Change CDROM:

attach-disk guest01 /root/disc2.iso hdc --driver file --type cdrom

--mode readonly

Remove CDROM:

attach-disk guest01 " " hdc --driver file --type cdrom

--mode readonly  

attach-disk 虚拟机名字 /home/kvm/soft/RHEL4.7.iso hdc --driver file --type cdrom --mode readonly