qemu-system-x86_64 fails to boot qcow2 image

[Nelson DSouza]

Steps:

1.Created a qcow2 image using Ubuntu virt-manager. This qcow2 image boots fine inside the virt-manager.

2.However, the same qcow2 image fails to boot when I try to boot it using the qemu-system-x86_64:

#!/bin/bash

qemu-system-x86_64 -m 16384 -boot d -enable-kvm -smp 16 -cpu host -net nic -net user,hostfwd=tcp::7777-:22 -drive file=/var/lib/libvirt/images/ubuntu18.04.qcow2,if=virtio -nographic

Error:
SeaBIOS (version 1.13.0-1ubuntu1)

iPXE (http://ipxe.org) 00:03.0 CA00 PCI2.10 PnP PMM+BFF8C8D0+BFECC8D0 CA00

Booting from DVD/CD...
Boot failed: Could not read from CDROM (code 0003)
Booting from Floppy...
Boot failed: could not read the boot disk

Booting from Hard Disk...

------

More Info -

:~$ qemu-system-x86_64 --version
QEMU emulator version 4.2.1 (Debian 1:4.2-3ubuntu6.8)
Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers

:~$ qemu-img check ubuntu18.04.qcow2
No errors were found on the image.
245760/245760 = 100.00% allocated, 0.00% fragmented, 0.00% compressed clusters
Image end offset: 16108814336

:~$ qemu-img info ubuntu18.04.qcow2
image: ubuntu18.04.qcow2
file format: qcow2
virtual size: 15 GiB (16106127360 bytes)
disk size: 1.88 GiB
cluster_size: 65536
Format specific information:
    compat: 1.1
    lazy refcounts: true
    refcount bits: 16
    corrupt: false

[Nelson DSouza (dsouzan)]

The qcow2 image created by virt-manager needed serial console to be enabled in grub. I was just not seeing the logs.