Wednesday, December 26, 2018

NBD (Network Block Device) kernel module - Build on RHEL 7

Prepare Directory Structure

mkdir -p ~/rpmbuild/{BUILD,BUILDROOT,RPMS,SOURCES,SPECS,SRPMS}
echo '%_topdir %(echo $HOME)/rpmbuild' > ~/.rpmmacros

Download Kernel Source

cd ~/rpmbuild
wget http://vault.centos.org/7.4.1708/os/Source/SPackages/kernel-3.10.0-693.el7.src.rpm

Install Kernel Source

cd ~/rpmbuild/SOURCES
rpm -ivh kernel-3.10.0-693.el7.src.rpm

BUILD

cd ~/rpmbuild/SPECS
rpmbuild -bp --target=$(uname -m) kernel.spec
cd ~/rpmbuild/BUILD/kernel-3.10.0-693.el7/linux-3.10.0-693.el7.x86_64
make menuconfig   #Device Driver -> Block devices -> Set “M” On “Network block device support”
make prepare && make modules_prepare && make
make M=drivers/block -j8
modinfo drivers/block/nbd.ko

INSTALL

cd ~/rpmbuild/BUILD/kernel-3.10.0-693.el7/linux-3.10.0-693.el7.x86_64
cp drivers/block/nbd.ko /lib/modules/3.10.0-693.el7.x86_64/extra/ 
depmod -a && sudo modprobe nbd