Unexpected behaviour, USB device apperars in all LXC machines

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saloiche

New Member
May 2, 2021
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Hello, I am trying to redirect an USB Zwave stick to one of the LXC machines, but to my surprise as soon as I plug the USB device it is available through "lsusb" in all the LXC machines, even I do not need to restart all of them.

If I run the "lsusb" command in each machine, I get the same response in all the LXC machines:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 020: ID 0658:0200 Sigma Designs, Inc. Aeotec Z-Stick Gen5 (ZW090) - UZB
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I have tried to redirect the USB through the "/etc/pve/lxc/machineId.conf" adding the following lines and restarting the machine
lxc.cgroup.devices.allow: c 189:* rwm
lxc.mount.entry: /dev/bus/usb/001/020 dev/bus/usb/001/020 none bind,optional,create=file

but the problem persist.

The most important is that the Zwave stick does not works in the intended LXC machine where I redirect the USB stick.

I have looked for different forums, and there is consistent information in the way to redirect an USB, even an specific topic in the DomoticZ forum, the application I want to run, but no information regarding this unexpected behaviour.

All the LCX machines are running: debian-10.9.0-amd64-ntinst.iso images

Running Proxmox:
CPU(s)
4 x Intel(R) Celeron(R) CPU J3455 @ 1.50GHz (1 Socket)
Kernel Version
Linux 5.4.73-1-pve #1 SMP PVE 5.4.73-1 (Mon, 16 Nov 2020 10:52:16 +0100)
PVE Manager Version
pve-manager/6.3-2/22f57405
 
saloiche said:
Hello, I am trying to redirect an USB Zwave stick to one of the LXC machines, but to my surprise as soon as I plug the USB device it is available through "lsusb" in all the LXC machines, even I do not need to restart all of them.

If I run the "lsusb" command in each machine, I get the same response in all the LXC machines:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 020: ID 0658:0200 Sigma Designs, Inc. Aeotec Z-Stick Gen5 (ZW090) - UZB
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


Click to expand...
In containers you can always see the host devices but they can be accessed from inside the container only if it's allowed by a lxc.cgroup.devices.allow entry.
 
Thank you Richard!

I have routed the USB to the LXC container using "lxc.cgroup.devices.allow" in the "lxc_id.conf" file.

Then I have restarted the LXC machine and tested the USB device using "test -w /dev/ttyAM0 && echo success || echo failure" command on the LXC console and also in the Proxmox console.

For my surprise I got "success" both in the Proxmox console and in the LXC console, I tested it in other LXC machines inside the Proxmox machine and I got "failure", as I should expect.

How is it possible that the USB device responds both in Proxmox machine and in the LXC machine?
 
Thank you for the clarification Bob.

I would appreciatte if anyone could test a Zwave USB or similar device using the test command I describe above, inside and ouside of the LXC virtual machine.
 
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