Ubuntu 18.04 Docker USB Passthrough to Docker Containers has Ownership root:root instead of root:dialout

[rlkoshak (Rich Koshak)]

@heman22union

The reason I’m talking about com ports is that the binding I’m using for the cm11a asks for the com port and in the example code they use com3.

Well, like I said, COM ports and COM3 is meaningless on Linux. /dev/ttyUSB0 is what you would use.

@heman22union

There isn’t any ttyUSB0 in the /dev directory.

In the container or on the host?

@heman22union

I used scp to copy the ttyUSB0 file from the docker host to the container.

That doesn’t do anything for you. The device is represented as a file, but you can’t just copy that file around.

You need:

• to have a user with UID 999 and GID 998 on your host
• that user must be a member of the dialout group
• try using --device=/dev/ttyUSB0:/dev/ttyUSB0:rwm which will map the device to the same location inside the container as outside the container and give the container read/write/mknod permission on the device.