I was trying to copy a somewhat large file (few gigabytes) to my container with:
lxc file push ~/file-on-host my-container/directory-in-container/
but the transfer was interrupted with the error:
Error: write: No space left on device
I have only one container and there is enough space on the host (ubuntu 20.04 arm64, lxd 4.0.9 installed with snap).
I already tried resizing the disk device to 20GiB on the default profile with:
lxc profile device set default root size 20GiB
and resizing the storage for the individual container:
lxc config device override my-container root size=20GiB
In the container, it still shows 100% used disk space:
user@my-container:~$ df -h
Filesystem Size Used Avail Use% Mounted on
default/containers/my-container 4.4G 4.4G 0 100% /
none 492K 4.0K 488K 1% /dev
udev 12G 0 12G 0% /dev/tty
tmpfs 100K 0 100K 0% /dev/lxd
tmpfs 100K 0 100K 0% /dev/.lxd-mounts
tmpfs 12G 0 12G 0% /dev/shm
tmpfs 2.4G 8.3M 2.4G 1% /run
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 12G 0 12G 0% /sys/fs/cgroup
snapfuse 58M 58M 0 100% /snap/core20/1380
snapfuse 58M 58M 0 100% /snap/core20/1408
snapfuse 62M 62M 0 100% /snap/lxd/22530
snapfuse 62M 62M 0 100% /snap/lxd/22761
snapfuse 38M 38M 0 100% /snap/snapd/15183
I am kind of a linux noob still and very new to lxd. I would be very grateful if someone could give me a hint on how to increase the storage in the container 
More information:
~$ lxc list
+--------------+---------+-----------+-----------+
| NAME | STATE | TYPE | SNAPSHOTS |
+--------------+---------+-----------+-----------+
| my-container | RUNNING | CONTAINER | 1 |
+--------------+---------+-----------+-----------+
~$ lxc config show my-container -e
architecture: aarch64
config:
image.architecture: arm64
image.description: ubuntu 20.04 LTS arm64 (release) (20220322)
image.label: release
image.os: ubuntu
image.release: focal
image.serial: "20220322"
image.type: squashfs
image.version: "20.04"
security.idmap.isolated: "true"
volatile.base_image: e7ecfc40fc692e64cb5f8ac588b6c331303e3d0b9f1b59ae7923a0d749a97048
volatile.eth0.host_name: vethb2bede98
volatile.eth0.hwaddr: 00:16:3e:9b:3d:63
volatile.idmap.base: "1065536"
volatile.idmap.current: '[{"Isuid":true,"Isgid":false,"Hostid":1065536,"Nsid":0,"Maprange":65536},{"Isuid":false,"Isgid":true,"Hostid":1065536,"Nsid":0,"Maprange":65536}]'
volatile.idmap.next: '[{"Isuid":true,"Isgid":false,"Hostid":1065536,"Nsid":0,"Maprange":65536},{"Isuid":false,"Isgid":true,"Hostid":1065536,"Nsid":0,"Maprange":65536}]'
volatile.last_state.idmap: '[{"Isuid":true,"Isgid":false,"Hostid":1065536,"Nsid":0,"Maprange":65536},{"Isuid":false,"Isgid":true,"Hostid":1065536,"Nsid":0,"Maprange":65536}]'
volatile.last_state.power: RUNNING
volatile.uuid: 8b77886e-e3ad-48a8-9d69-7380acd7098f
devices:
eth0:
name: eth0
network: lxdbr0
type: nic
my-ports-device:
connect: tcp:127.0.0.1:25570
listen: tcp:0.0.0.0:25570
type: proxy
root:
path: /
pool: default
size: 20GiB
type: disk
ssh-port-device:
connect: tcp:127.0.0.1:22
listen: tcp:0.0.0.0:54022
type: proxy
ephemeral: false
profiles:
- default
- my-proxy-profile
stateful: false
description: ""
There are two profiles:
~$ lxc profile show default
config:
security.idmap.isolated: "false"
description: Default LXD profile
devices:
eth0:
name: eth0
network: lxdbr0
type: nic
root:
path: /
pool: default
size: 20GiB
type: disk
name: default
used_by:
- /1.0/instances/my-container
~$ lxc profile show my-proxy-profile
config:
security.idmap.isolated: "true"
description: ""
devices:
my-ports-device:
connect: tcp:127.0.0.1:25570
listen: tcp:0.0.0.0:25570
type: proxy
ssh-port-device:
connect: tcp:127.0.0.1:22
listen: tcp:0.0.0.0:54022
type: proxy
name: my-proxy-profile
used_by:
- /1.0/instances/my-container
Some storage info:
~$ lxc storage info default
info:
description: ""
driver: zfs
name: default
space used: 6.78GiB
total space: 6.78GiB
used by:
images:
- e7ecfc40fc692e64cb5f8ac588b6c331303e3d0b9f1b59ae7923a0d749a97048
instances:
- my-container
profiles:
- default
~$ lxc storage show default
config:
size: 8GB
source: /var/snap/lxd/common/lxd/disks/default.img
zfs.pool_name: default
description: ""
name: default
driver: zfs
used_by:
- /1.0/images/e7ecfc40fc692e64cb5f8ac588b6c331303e3d0b9f1b59ae7923a0d749a97048
- /1.0/instances/my-container
- /1.0/profiles/default
status: Created
locations:
- none
~$ lxc storage show default --resources
space:
used: 7281438208
total: 7281438208