shrink virtual disk size of VM

Source: https://albertomolina.wordpress.com/2016/12/02/shrinking-qcow2-images/

virt-df -h image.raw
Filesystem                                Size       Used  Available  Use%
image.raw:/dev/sda1                    1.9G      1020M       837M   52%

guestfish
><fs> add image.raw
><fs> run
><fs> list-filesystems
/dev/sda1: ext4
><fs> e2fsck-f /dev/sda1
><fs> resize2fs-size /dev/sda1 1500M
><fs> e2fsck-f /dev/sda1
><fs> quit

virt-df -h image.raw
Filesystem                                Size       Used  Available  Use%
image.raw:/dev/sda1                    1.4G      1020M       333M   71%

root@a2s42:/var/lib/libvirt/images# qemu-img resize -f raw image.raw 1.5G
Image resized.
root@a2s42:/var/lib/libvirt/images# qemu-img info image.raw
image: image.raw
file format: raw
virtual size: 1.5G (1610612736 bytes)
disk size: 1.5G

Other sources:
https://jtechboard.blogspot.com/2017/11/openstack-shrink-image-virtual-disk-size.html
https://gist.github.com/cojocar/163d2a37f99519ad0a40