hi there,
This is my workaround for ‘read-only file system’ error when deleting a storage pool of LXD. I hope this is useful for you.
$ lxc storage delete default
Error: Failed removing mount path "/var/snap/lxd/common/lxd/storage-pools/default": Failed removing "/var/snap/lxd/common/lxd/storage-pools/default/containers": unlinkat /var/snap/lxd/common/lxd/storage-pools/default/containers/backup.2264386518/.backup/metadata.yaml: read-only file system
‘default’ pool is a dedicated partition (/dev/vde1) by btrfs driver.
I have never taken snapshots of instances or custom volumes.
However, I’ve seen errors when running “lxd export” or “lxc storage volume export”.
I gues that “read-only filesystem” is a orphaned snapshot left by the failed export
$ mkdir /mnt/vde1
$ mount /dev/vde1 /mnt/vde1
$ cd /mnt/vde1
$ btrfs subvol list .
ID 537 gen 993954 top level 5 path containers/backup.2264386518/.backup
ID 538 gen 993962 top level 5 path containers/backup.3880797388/.backup
ID 724 gen 1303155 top level 5 path custom/backup.2332913389/.backup
ID 725 gen 1303160 top level 5 path custom/backup.2127012284/.backup
$ btrfs subvol show containers/backup.2264386518/.backup
containers/backup.2264386518/.backup
Name: .backup
UUID: 7ea874e0-98e9-ad47-924d-48c051d5004e
Parent UUID: 610ffd12-77a0-c349-b7ba-e93dcfa88c0f
Received UUID: -
Creation time: 2023-03-25 20:39:17 +0000
Subvolume ID: 537
Generation: 993954
Gen at creation: 993954
Parent ID: 5
Top level ID: 5
Flags: readonly
Snapshot(s):
$ btrfs property set containers/backup.2264386518/.backup ro false
$ btrfs subvol show containers/backup.2264386518/.backup
Name: .backup
UUID: 7ea874e0-98e9-ad47-924d-48c051d5004e
Parent UUID: 610ffd12-77a0-c349-b7ba-e93dcfa88c0f
Received UUID: -
Creation time: 2023-03-25 20:39:17 +0000
Subvolume ID: 537
Generation: 993954
Gen at creation: 993954
Parent ID: 5
Top level ID: 5
Flags: -
Snapshot(s):
$ btrfs property set containers/backup.3880797388/.backup ro false
$ btrfs property set tustom/backup.2332913389/.backup ro false
$ btrfs property set custom/backup.2127012284/.backup ro false
$ lxc storage delete default
Storage pool default deleted