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How to shrink OpenStack qcow2 image using qemu-img – tuxfixer.com http://www.tuxfixer.com/how-to-shrink-openstack-qcow2-image-with-qemu-img/
Fri Nov 15 14:31:27 2019 archive.org
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If you transfer qcow2 images very frequently across OpenStack Clouds or between KVM and Openstack environments, they can quickly grow larger. Luckily qcow2 image size can be decreased to reasonable values using qemu-img tool. Below we present how to shrink Openstack/KVM qcow2 image.

Examples:

Shrink qcow2 image without compression (larger file, short compression time):

[root@tuxfixer ~]# qemu-img convert -O qcow2 centos7.qcow2 centos7_small.qcow2
Shrink qcow2 image with compression (smaller file, long compression time):

[root@tuxfixer ~]# qemu-img convert -O qcow2 -c centos7.qcow2 centos7_small.qcow2

qcow2 qemu image size
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