This is the crucial step. We’ll use guestfish (or libguestfs ) to mount the qcow2, partition it, and copy the Cisco files.
| Cisco Image Type | Boot Method in QEMU | |----------------|----------------------| | IOS (classic, e.g., c7200-*.bin ) | Loaded directly by QEMU as a kernel ( -kernel ) | | IOS-XE (CSR1000v, ASAv) | Requires bootable disk with GRUB + .bin as kernel | | vIOS / vIOS-L2 | Already QEMU-ready; often supplied as .qcow2 | | NX-OS | Separate process (uses different boot architecture) |
For 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. convert cisco bin to qcow2
virtioa.qcow2 : The standard naming convention used by EVE-NG for primary virtual disks. Method 2: Handling Legacy Cisco IOS (.bin) Images
Secure the native .qcow2 files directly from the Cisco Software Central portal under the CML download section. This is the crucial step
mv cisco_virtual_image.qcow2 /opt/unetlab/addons/qemu/csr1000vng-universalk9.17.03.04/virtioa.qcow2 Use code with caution. Fix the system permissions in EVE-NG: /opt/unetlab/wrappers/unl_wrapper -a fixpermissions Use code with caution. Optimizing for GNS3 Open GNS3 and navigate to -> Qemu VMs . Click New to create a template.
Run the qemu-img convert command with the -c flag for high-ratio compression: This is not a disk conversion, but produces a runnable image
Network engineers frequently need to build virtual labs for testing, validation, and training. Cisco virtualization platforms like Modeling Labs (CML), GNS3, and EVE-NG rely heavily on QCOW2 (QEMU Copy-On-Write v2) images to run virtual devices. However, official Cisco software updates are typically distributed as .bin files, which are compiled for physical hardware architectures.
The native disk image format for QEMU/KVM hypervisors. It supports thin provisioning, snapshots, and delayed allocation of storage.
EVE-NG requires strict directory naming structures for images to map correctly to their templates.
If your file is not already in .vmdk or .raw format, try extracting it using tar or unzip , though many .bin files are actually raw disk images. Verify the file type: Use the file command: file iosv.bin Use code with caution.