I tried to use febootstrap to make a roofs image for qemu-kvm. I frist generated a roofs with command
febootstrap -i coreutils -i vim centos79 centos_7.9 [url]https://mirrors.163.com/centos/7/os/x86_64/[/url] After that, I got a directory as following > tree centos_7.9/ -L 1 centos_7.9/ ├── bin -> usr/bin ├── boot ├── dev ├── etc ├── home ├── lib -> usr/lib ├── lib64 -> usr/lib64 ├── media ├── mnt ├── opt ├── proc ├── root ├── run ├── sbin -> usr/sbin ├── srv ├── sys ├── tmp ├── usr └── var Then, I created a qemu image and copied all file from centos_7.9 to the image. qemu-img create centos79.img 1g mkfs.ext4 centos79.img mkdir mnt_dir sudo mount -o loop centos79.img mnt_dir cp centos_7.9/* mnt_dir umount mnt_dir However, when I run qemu-system-x86_64 -kernel /boot/vmlinuz-`uname -r` \ -hda=centos79.img \ -append "root=/dev/sda console=ttyS0" \ -enable-kvm -nographic or qemu-system-x86_64 -kernel /boot/vmlinuz-`uname -r` \ -drive file=centos79.img \ -append "root=/dev/hda console=ttyS0" \ -enable-kvm -nographic It reported that [ 1.766919] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) [ 1.767906] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.14.0-3.1.0.kwai+ #10 [ 1.767906] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.5.1 01/01/2011 [ 1.767906] Call Trace: [ 1.767906] dump_stack_lvl+0x34/0x48 [ 1.767906] panic+0xfb/0x2cd [ 1.767906] mount_block_root+0x28c/0x29f [ 1.767906] prepare_namespace+0x13b/0x16a [ 1.767906] kernel_init_freeable+0x17f/0x1a4 [ 1.767906] ? rest_init+0xc0/0xc0 [ 1.767906] kernel_init+0x16/0x130 [ 1.767906] ret_from_fork+0x22/0x30 [ 1.767906] Kernel Offset: disabled [ 1.767906] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]--- What should I do to fix this?
