To achieve the cleanest performance, you should perform the repack on a Linux-based host (or inside your EVE-NG/GNS3 host terminal) using standard qemu-img utilities. This process strips out zeroes, compresses the filesystem blocks, and ensures universal hypervisor compatibility. Step 1: Verify the Original Image Integrity
Create a directory following the required naming convention, e.g., /opt/unetlab/addons/qemu/csr1000vng-16.12.1b/ Rename the image to virtioa.qcow2 inside that folder. Run the permissions fix utility: /opt/unetlab/wrappers/unl_wrapper -a fixpermissions GNS3 Appliance (.gns3a) file csr1000vucmk916121bserialqcow2 repack best
If you have a legitimate CSR1000v image with serial ucmk916121b and need a repacked qcow2 for a lab deployment, follow this recipe: To achieve the cleanest performance, you should perform
If you are planning to deploy this repacked image, let me know: To achieve the cleanest performance