How to resize virtual machine size in btrfs & snap?

LXD
,
1

I have virtual machine created by following command

lxc launch images:ubuntu/focal dfoss

It tried to increase it size to 64G but I couldn’t
my storage bool

[syaslem@lucid ~]$ lxc storage info default
info:
  description: ""
  driver: btrfs
  name: default
  space used: 122.11GB
  total space: 1.00TB
used by:
  images:
  - 8e4d025b836f8a2a8df25c6268e926f87cdcd7d682f0d9a8e52b017881ea10db
  - 9b2d34a71d2893ea74cc3e14c7bce5873d37e6bd39fe16fa29b04d908b7ea3d2
  instances:
  - dfoss
  - secure-lizard
  profiles:
  - default

[syaslem@lucid ~]$ lxc storage list
+---------+--------+------------------------------------------------+-------------+---------+
|  NAME   | DRIVER |                     SOURCE                     | DESCRIPTION | USED BY |
+---------+--------+------------------------------------------------+-------------+---------+
| default | btrfs  | /var/snap/lxd/common/lxd/storage-pools/default |             | 5       |
+---------+--------+------------------------------------------------+-------------+---------+

Inside the Virtual Machine

I tried growpart

root@dfoss:~# growpart /dev/sda 2
NOCHANGE: partition 2 is size 19324383. it cannot be grown

and resize2fs /dev/sda2

root@dfoss:~# resize2fs /dev/sda2
resize2fs 1.45.5 (07-Jan-2020)
The filesystem is already 2415547 (4k) blocks long.  Nothing to do!

df -h outout

root@dfoss:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            477M     0  477M   0% /dev
tmpfs            98M  708K   98M   1% /run
/dev/sda2       8.9G  842M  8.1G  10% /
tmpfs           489M     0  489M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           489M     0  489M   0% /sys/fs/cgroup
/dev/sda1        99M  3.9M   95M   4% /boot/efi
tmpfs            50M   11M   40M  21% /run/lxd_agent
tmpfs            98M     0   98M   0% /run/user/0
2

Hi,
Have you ever looked at that link before, it contains some hints about resizing btrfs.
https://linuxcontainers.org/lxd/docs/master/storage#growing-a-loop-backed-btrfs-pool
Regards.

3

I checked it but it do nothing

$ sudo truncate -s +64G /var/snap/lxd/common/lxd/disks/default.img
$ sudo losetup -c /dev/loop5 # lxd loop
$ sudo btrfs filesystem resize max /var/snap/lxd/common/lxd/storage-pools/default
Resize device id 1 (/dev/nvme0n1p2) from 931.51GiB to max

then I tried restart the virtual machine then grow it but I can’t

root@dfoss:~# growpart /dev/sda 2
NOCHANGE: partition 2 is size 19324383. it cannot be grown
root@dfoss:~# resize2fs /dev/sda2
resize2fs 1.45.5 (07-Jan-2020)
The filesystem is already 2415547 (4k) blocks long.  Nothing to do!

root@dfoss:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            477M     0  477M   0% /dev
tmpfs            98M  708K   98M   1% /run
/dev/sda2       8.9G  842M  8.1G  10% /
tmpfs           489M     0  489M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           489M     0  489M   0% /sys/fs/cgroup
/dev/sda1        99M  3.9M   95M   4% /boot/efi
tmpfs            50M   11M   40M  21% /run/lxd_agent
tmpfs            98M     0   98M   0% /run/user/0
root@dfoss:~#
4

Hi Salem,
So is this a lxd container or a vm? Can you paste this command output in the container/vm?
df -Th
Regards.

5

thank you for response

Output

root@dfoss:~# df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
udev           devtmpfs  477M     0  477M   0% /dev
tmpfs          tmpfs      98M  708K   98M   1% /run
/dev/sda2      ext4      8.9G  842M  8.1G  10% /
tmpfs          tmpfs     489M     0  489M   0% /dev/shm
tmpfs          tmpfs     5.0M     0  5.0M   0% /run/lock
tmpfs          tmpfs     489M     0  489M   0% /sys/fs/cgroup
/dev/sda1      vfat       99M  3.9M   95M   4% /boot/efi
tmpfs          tmpfs      50M   11M   40M  21% /run/lxd_agent
tmpfs          tmpfs      98M     0   98M   0% /run/user/0
6

I think @tomp explained in that post already, look at that link.
https://discuss.linuxcontainers.org/t/how-can-i-expand-the-size-of-vm/7618/3
Regards.

1 Like
7

I tried it, I mentioned growpart and resize2fs above
don’t be like Arch community :frowning_face:

8

fixed, thanks @cemzafer @toby63 (I got the solution from one of his comments)

the solution is to override config for my vm and specify new size for it

lxc config device override [vm name] root size=15GB

or

lxc config device set [vm name] root size=64GB
9

After override the root disk size dont forget to restart the vm.
Regards.

1 Like
10

that work great, thank you again