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Resize Root Disk Image
The safest way to increase the size of root.img is to turn your TemplateVM into a StandaloneVM. Doing this means it will have it's own root filesystem (StandaloneVMs use a copy of template, instead of smart sharing). To do this run qvm-create --standalone from dom0 Konsole.
Resize a StandaloneVM Root Image
In dom0 Konsole run the following command (replace the size and path):
truncate -s 20G /var/lib/qubes/appvms/standalonevm/root.img
Then start Terminal for this StandaloneVM and run:
sudo resize2fs /dev/mapper/dmroot
Shutdown the StandaloneVM and you will have extended the size of it's root.img
Resize a TemplateVM Root Image
In dom0 Konsole run the following command (replace the size and path):Make sure changes in the TemplateVM between reboots didn't exceed 10G.
truncate -s 20G /var/lib/qubes/vm-templates/fedora-21/root.img
Then start Terminal for this TemplateVM and run the following:
sudo resize2fs /dev/mapper/dmroot
Shutdown the TemplateVM and you will have extended the size of it's root.img