Devnodes
Exporting devices through devnodes[edit]
You can export devices from the Hardware Node (HN) to the container (CT) by using the devnodes flag, here for example for a serial port adaptor (/dev/ttyUSB0):
$ vzctl set 1024 --devnodes ttyUSB0:rw --save
# vzctl enter 1024 entered into CT 1024 root@1024 / [1]# screen /dev/ttyUSB0 57600 8N1 [detached from 17017.pts-0.1024] root@1024 / [2]# ls -al /dev/ttyUSB0 crw-r----- 1 root root 188, 0 Apr 17 15:36 /dev/ttyUSB0
If you remove suddenly the device, vzctl will complain and continue:
# vzctl enter 1024 Incorrect device name /dev/ttyUSB0: No such file or directory Invalid value for DEVNODES=ttyUSB0:rw, skipped entered into CT 1024 root@1024 / [1]#
Inside the container, you can set a different owner than root, thereby regulating internal access privileges possibly differently from the host system.
List of successfull exported devices[edit]
- /dev/ttyUSB0
- /dev/i2c-* (tested through i2c-parport)
- /dev/net/tun
