Expanding VM inconsistency

[Ziggy]

I initially setup an ubuntu server VM with 20G of space and subsequently decided to increase that to 50G. I did this by editing the zvol. On reboot the VM cli reports the devices as follows via 'df -h':

Filesystem Size Used Avail Use% Mounted on
tmpfs 97M 1020K 96M 2% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 20G 8.4G 11G 45% /
tmpfs 484M 0 484M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 4.0M 0 4.0M 0% /sys/fs/cgroup
/dev/sda2 976M 129M 780M 15% /boot
/dev/sda1 511M 5.3M 506M 2% /boot/efi
tmpfs 97M 4.0K 97M 1% /run/user/1000

I have researched how to expand that volume via the cli and a) am unsure if I have the right advice, and b) found it difficult to understand. So I mounted a gparted iso from the internal virtual cd-rom and it shows the volume as the complete 50G:

Any advice on how to resolve this? Thanks.

 

[Patrick M. Hausen]

It's a LVM volume group, obviously. I did that multiple times in the past and it wasn't that difficult. But I did not keep notes. Just searched for e.g. "ubuntu vm expand lvm" ...

Maybe this helps: https://www.geoffstratton.com/expand-hard-disk-ubuntu-lvm

Kind regards,
Patrick

 

[Ziggy]

Thanks Patrick. That guide is very handy and I appreciate the link. I started parted and free space is reported as:

(parted) print free
Model: ATA QEMU HARDDISK (scsi)
Disk /dev/sda: 53.7GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
17.4kB 1049kB 1031kB Free Space
1 1049kB 538MB 537MB fat32 boot, esp
2 538MB 1612MB 1074MB ext4
3 1612MB 53.7GB 52.1GB

That is, just over a MB of free space. Yet you can see sda is reported as 53.7GB and partition n. 3 as the bulk of that with no free space label under file system. When I proceed to cfdisk, I get this:

and 'new' is not available anyway, only 'resize'. I could just delete this vm and start again - I may have to - but I was trying to avoid this as I have a few things configured already, like wireguard.

 

[Patrick M. Hausen]

So the partition seems to be expanded already. You now need to proceed with the logical volume groups etc.

 

[Ziggy]

Thanks. Making progress. So this next step worked:

sudo lvextend -l+100%FREE /dev/ubuntu-vg/ubuntu-lv
Size of logical volume ubuntu-vg/ubuntu-lv changed from 20.00 GiB (5120 extents) to <48.50 GiB (12415 extents).
Logical volume ubuntu-vg/ubuntu-lv successfully resized.

But the 'resizefs' didn't. Input/Output:

sudo resize2fs /dev/mapper/ubuntu-vg/ubuntu-lv
resize2fs 1.45.7 (28-Jan-2021)
open: No such file or directory while opening /dev/mapper/ubuntu-vg/ubuntu-lv

When I checked 'df -h', output shows:

/dev/mapper/ubuntu--vg-ubuntu--lv 20G 8.4G 11G 45% /

Noting the two dashes in this device readout, I tried again with the extra dashes, but same result of no such file or directory.

 

[Patrick M. Hausen]

Please post a copy of the precise last command you tried and the error message.
Please use code tags for commands and output like so:

Code:

this
is
command
text

Thanks,
Patrick

 

[Ziggy]

I'm afraid I don't understand your request Patrick.
This is the last command I used:
sudo resize2fs /dev/mapper/ubuntu--vg/ubuntu--lv

This was the output of that command:
resize2fs 1.45.7 (28-Jan-2021)
open: No such file or directory while opening /dev/mapper/ubuntu--vg/ubuntu--lv

 

[Patrick M. Hausen]

Please format commands and output like this:

Code:

sudo resize2fs /dev/mapper/ubuntu--vg/ubuntu--lv
resize2fs 1.45.7 (28-Jan-2021)
open: No such file or directory while opening /dev/mapper/ubuntu--vg/ubuntu--lv

And I guess from the output of your df command above the correct command line is:

Code:

sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv

Notice the subtle difference? Simple typo if it works out, now.

 

[Ziggy]

Aw, jeez, how did I miss that? Thanks Patrick. Sorted. If you'll bear with me, in terms of your pointing me to writing code, do I simply write
code:
This is my command

and then
code:
This is my output

 

[Patrick M. Hausen]

 

[Ziggy]

I appreciate your patience. I looked and missed that too. Thank you very much for your help.