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[ubuntu] Increase the size kvm vm with lvm?

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Hi all,

Running ubuntu18 with kvm. currently running 2 vms. each vm is ubuntu 18. Both are sitting in the /dev/lvg/vmstorage on the host server. one vm is 99G and the other is 45G.

Code:

root@serv:/home/admin# ls -l /var/vmstorage/
total 105637884
-rw------- 1 libvirt-qemu kvm  48325984256 Nov 21 22:22 mailserv
-rw------- 1 libvirt-qemu kvm 106316892016 Nov 21 22:22 webserv

I would like to increase the storage space in one of the VM's using LVM.

I have already increased the size of the vm image using:
Code:

root@serv:/home/admin# qemu-img resize /var/vmstorage/webserv +20G
Image resized.

root@serv:/home/admin# lsblk
NAME              MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda                  8:0    0  1.7T  0 disk
├─sda1              8:1    0  1.9G  0 part /boot
├─sda2              8:2    0    1K  0 part
└─sda5              8:5    0  1.6T  0 part
  ├─LVG-root      253:0    0    4G  0 lvm  /
  ├─LVG-usr        253:1    0    6G  0 lvm  /usr
  ├─LVG-var        253:2    0    4G  0 lvm  /var
  ├─LVG-tmp        253:3    0  3.5G  0 lvm  /tmp
  ├─LVG-bak        253:4    0  7.5G  0 lvm  /bak
  ├─LVG-srv        253:5    0  3.8G  0 lvm  /srv
  ├─LVG-opt        253:6    0  52G  0 lvm  /opt
  ├─LVG-home      253:7    0  1.8G  0 lvm  /home
  ├─LVG-isostorage 253:8    0    5G  0 lvm  /var/isostorage
  └─LVG-vmstorage  253:9    0  170G  0 lvm  /var/vmstorage
sr0                11:0    1 1024M  0 rom 
sr1                11:1    1 1024M  0 rom

on the host server, and it increased from 150G to 170G.

The current size of the vm is 99G, would like to add +20G

But I can seem to increase the size on the vm guest side:

I tried:
Code:

root@webserv:/home/admin# lvextend -l 100%FREE -r /dev/webserv-vg/root
  New size of 0 not permitted.

root@webserv:/home/admin# lsblk
NAME                  MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sr0                    11:0    1 1024M  0 rom 
vda                    252:0    0  119G  0 disk
└─vda1                252:1    0  99G  0 part
  ├─webserv--vg-root  253:0    0  98G  0 lvm  /
  └─webserv--vg-swap_1 253:1    0  980M  0 lvm  [SWAP]

root@webserv:/home/admin# lvextend -L+20G -r /dev/webserv-vg/root
  Insufficient free space: 5120 extents needed, but only 0 available

root@webserv:/home/admin#

But it is not letting me

What do I need to do?

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