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RedHat/TemplateVM.

1- Installation	2- Network	3- Firewall	4- Selinux
5- Logs	6- Certificates	7- Mail	8- PassphraseSSH
9- Sudo	10- GnomeShell	11- CloneVM	12- Volume
13- Troubleshoot

12. Logical volume.

vgdisplay displays the available space on the logical volume group.
vgdisplay

Alloc PE / Size       5120 / 20.00 GiB  
Free  PE / Size       3882 / 15.16 GiB  

You have 15.16G available for logical volumes.
Example:
/dev/vgl0/var needs +4G.
lvextend -L+4G /dev/vgl0/var
resize2fs /dev/vgl0/var
Refreshing the free space of the logical volume group.
vgdisplay

Alloc PE / Size       6144 / 24.00 GiB  
Free  PE / Size       2858 / 11.16 GiB  

You have 11.16G left.