sudo parted /dev/nbd0 mklabel msdos sudo parted /dev/nbd0 mkpart primary ext4 1MiB 100% sudo mkfs.ext4 /dev/nbd0p1
| Tool | Purpose | Typical Source |
|------|---------|----------------|
| qemu-img | Create raw/qcow2 disk images | QEMU package (apt install qemu-utils) |
| qemu-system-x86_64 | Emulate the hardware | QEMU package |
| unzip / tar | Extract Cisco image (if compressed) | Base OS |
| fdisk / parted | Partition management (optional) | Base OS |
| extlinux or GRUB | Bootloader installation | Syslinux package |
| Linux kernel & initrd | Minimal boot environment | Custom or prebuilt |
Critical note: Cisco
.binfiles are not raw disk images. They are bootable firmware executables that run directly on Cisco hardware or under QEMU’s Cisco emulation (vIOS, vIOS-L2, CSR1000v, etc.). The conversion process embeds the.bininto a bootable disk that loads it. convert cisco bin to qcow2
For IOS (classic) or some IOS-XE images, you can skip the bootloader entirely and boot the .bin directly as a kernel. This is not a disk conversion, but produces a runnable image.
qemu-system-x86_64 -m 512 -kernel c7200-image.bin -nographic
To convert this into a qcow2 that auto-boots, you would still need a minimal bootloader, as above. sudo parted /dev/nbd0 mklabel msdos sudo parted /dev/nbd0
You can verify the integrity of the Qcow2 image using the qemu-img command:
qemu-img info cisco_ios.qcow2
This command displays information about the Qcow2 image, including its format, size, and geometry. Critical note : Cisco
7z x cisco-image.bin
Look for a squashfs or rootfs file inside. For IOS-XE (CSR1000v), you may find a directory like csr1000v-mono-universalk9.16.12.05/.
| Problem | Likely Solution |
|--------|----------------|
| Kernel panic | Missing initrd or wrong root= parameter |
| “No bootable device” | GRUB not installed or wrong partition type |
| Image too large | Use qemu-img resize to shrink before boot |
| Serial console garbage | Use -serial mon:stdio and match baud rate (usually 9600) |
| Unsupported CPU | Add -cpu max or -cpu host |