sudo virt-make-fs --type=ext4 --size=+$DISK_SIZE --format=qcow2 --partition=mbr
--label=CISCO_BOOT "$BIN_FILE" "$QCOW2_FILE"
For older IOS images (classic 7200, 3700 series), the process is notoriously difficult because the binaries are proprietary ELF formats expecting specific hardware. The most reliable feature for converting these is actually using GNS3 as a bridge. convert cisco bin to qcow2
GNS3 dynamically creates QEMU disk images when you drag a router into the workspace. guestfish -a cisco
guestfish -a cisco.qcow2
Inside guestfish:
run
part-disk /dev/sda mbr
mkfs ext4 /dev/sda1
mount /dev/sda1 /
tar-in cisco-extracted/rootfs.tar / # if you have a tarball
copy-in /path/to/cisco-extracted/binaries /boot
If you have a raw filesystem directory:
guestfish -a cisco.qcow2
run
part-disk /dev/sda mbr
mkfs ext4 /dev/sda1
mount /dev/sda1 /
copy-in /full/path/to/cisco-filesystem /