很奇怪 centos 8.0没有提供nbd.ko这个内核模块 还要自己编译下
yum install kernel-devel-4.18.0-80.el8.x86_64.rpm
yum install kernel-headers-4.18.0-80.el8.x86_64.rpm
rpm -ivh kernel-4.18.0-80.el8.src.rpm
rpmbuild -bp /root/rpmbuild/SPECS/kernel.spec
cd /root/rpmbuild/BUILD/kernel-4.18.0-80.el8/linux-4.18.0-80.el8.x86_64/
make mrproper
cp -aprvf /usr/src/kernels/4.18.0-80.el8.x86_64/.config ./
cp -aprvf /usr/src/kernels/4.18.0-80.el8.x86_64/Module.symvers ./
make oldconfig
make modules_prepare
make scripts
make CONFIG_BLK_DEV_NBD=m M=drivers/block
ls drivers/block/nbd.ko