[SOLVED] LXC and device passthrough

Y

yarii

Renowned Member
Mar 24, 2014
150
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Hi all,

I tried to passthrough /dev/ttyS0 and /dev/ttyUSB0 to container by:

lxc-device add -n 204 /dev/ttyS0
lxc-device add -n 204 /dev/ttyUSB0

It works well.

For making it avaible after container restart I added this to /var/lib/lxc/204/config by adding lines:
lxc.cgroup.devices.allow = c 4:64 rwm
lxc.cgroup.devices.allow = c 188:0 rwm

After container restart there is old config without changes.

How to properly do /dev/USB and /dev/ttyS0 passthrough?

Regards.
JK
 
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Do I need to do something more?

After rebooting container ...
204#
ls -la /dev/ | grep ttyS0
doesn't show anything.
 
I added this:
mknod /dev/ttyS0 c 4 64
chown root.dialout /dev/ttyS0
chmod 0644 /dev/ttyS0

to my rc.local.

And it is OK right now.
 
yarii said:
I did:
mknod /dev/ttyS0 c 4 64
chown root.dialout /dev/ttyS0
chmod 0644 /dev/ttyS0

It is OK right now.
Click to expand...
the "lxc.cgroup.devices.allow" lines only tell lxc to setup the container's cgroup to allow access to or creation of the specified device nodes (see https://www.kernel.org/doc/Documentation/cgroup-v1/devices.txt for the gory details ;)). You need to create the device nodes yourself in the container (either manually, or using an init script, or using an autodev hook).
 
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