編譯 nbd 模塊
yum install kernel-devel kernel-headers
cd /tmp
wget ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/kernel-2.6.32.220.4.2.el6.src.rpm (CentOS 6 其他版本的 kernel source rpm file 亦可在此下載)
rpm -ivh kernel-2.6.32.220.4.2.el6.src.rpm
cd ~/rpmbuild/SOURCES
tar jxf linux-2.6.32-220.4.2.el6.tar.bz2 -C /usr/src/kernels/
cd /usr/src/kernels
mv $(uname -r) $(uname -r)-old
mv linux-2.6.32-220.4.2.el6 $(uname -r)
cd $(uname -r)
make mrproper
cp ../$(uname -r)-old/Module.symvers .
cp /boot/config-$(uname -r) ./.config
make oldconfig
make prepare
make scripts
make CONFIG_BLK_DEV_NBD=m M=drivers/block
cp drivers/block/nbd.ko /lib/modules/$(uname -r)/kernel/drivers/block/
depmod -a
modprobe nbd 啓用nbd模塊
擴展nbd設備個數：http://www.spinics.net/lists/mm-commits/msg46091.html