Passthrough directory to VM

LXD
1

How do you passthrough a directory the a VM?

lxc config device add webserver test disk source=/mnt/pool/storage/test path=/mnt/test
Error: Invalid devices: Device validation failed "test": Invalid device option "path"

lxc config device add webserver test disk source=/mnt/pool/storage/test
Device test added to webserver

lxc start webserver
Error: Failed to run: qemu-system-x86_64 -S -name webserver -uuid 983e0289-2bce-4187-9f35- 
79f7459b1bb5 -daemonize -cpu host -nographic -serial chardev:console -nodefaults -no-reboot -no- 
user-config -readconfig /var/snap/lxd/common/lxd/logs/webserver/qemu.conf -pidfile 
/var/snap/lxd/common/lxd/logs/webserver/qemu.pid -D / 
/var/snap/lxd/common/lxd/logs/webserver/qemu.log -chroot /var/snap/lxd/common/lxd/virtual- 
machines/webserver -runas lxd: : exit status 1
Try `lxc info --show-log webserver` for more info

lxc info --show-log webserver
Name: webserver
Location: none
Remote: unix://
Architecture: x86_64
Created: 2020/01/25 23:15 UTC
Status: Stopped
Type: virtual-machine
Profiles: default, vm
Snapshots:
  snapshot-0 (taken at 2020/01/26 02:00 UTC) (expires at 2020/02/02 02:00 UTC) (stateless)

Log:

qemu-system-x86_64:/var/snap/lxd/common/lxd/logs/webserver/qemu.conf:165: A regular file was 
expected by the 'file' driver, but something else was given
2

Not supported, with a VM you can only pass a partition or disk image in as a disk, you can’t bind-mount a directory as can be done with containers, at least not yet.

@tomp looks like we need to fix our logic to refuse non-files at least.

3

I understand, thank you very much! Would love to see this feature added in the future if possible at all.

4

Yeah, we’ve been planning on adding it. It will require the agent to be running in the VM and will effectively be dynamically passing new 9p mounts.

1 Like
5

https://github.com/lxc/lxd/pull/6780 will improve the reported error

2 Likes