Docker (Transport endpoint is not connected) Error

Help and Support
1

Hi All,

I am calling rclone using screen and for the most part the mount is very stable. If however I happen to clone and reopen the mount I am having issues with it being passed through to my docker.

I had similar issues previously with other mount points that have been resolved by using Slave:RW when mapping the mount point to docker. It is a docker variable that helps when the mount may be mounted after the docker is started. It works with acd_cli and unionfs fused mount points, but doesn’t seem to work with rclone.

If I access the rclone mount point from my host I get in fine, but if I access from inside the docker I get the “Transport endpoint is not connected” error. Restarting the docker fixes it, but I would like to avoid that.

Any ideas?

Thanks,
Wob

2

Can you point me at some docs for that - I can’t seem to find any.

That error means that the rclone process is no longer connected to /dev/fuse.

There is a possible work-around in this thread: http://stackoverflow.com/questions/28865407/cant-expose-a-fuse-based-volume-to-a-docker-container

You might be able to work around this by wrapping the mount call in nsenter to mount it in the same Linux mount namespace as the docker daemon, eg.

nsenter -t “$PID_OF_DOCKER_DAEMON” encfs …

3

I wish I could, the documentation of the Slave option seems to be very lacking from Docker. The lack of documentation is discussed here (https://github.com/docker/docker/issues/20555). The information I found is from the unraid forums (that is my host OS). One of the guys over there (squid) seems aware of the use and mentions here (http://lime-technology.com/forum/index.php?topic=52033.msg512577#msg512577) he may be able to point to documentation.

At the moment I now have rclone mounted as the lower layer (RO) of a union-fs fused mount, I haven’t seen the error since, so maybe the extra layer has fixed it. If it re-appears I will try on the work-around.

Thanks,
Wob

4

Glad you’ve got it working and let me know if that work-around is needed.

If you can work out what rclone needs to do differently then do let me know!