[lxc-users] Mounting fuse in a container - most recent instructions don't seem to work

[Tony Lewis]

I am trying to use FUSE in a container, namely bup.  I get the following 
error:

fusermount: mount failed: Operation not permitted

The most recent instructions for this seem to be at 
http://blog.forshee.me/2016/02/container-mounts-in-ubuntu-1604.html, and 
seem to include:

|echo Y | sudo tee /sys/module/fuse/parameters/userns_mounts|

But when I run this on the host I get:

tee: /sys/module/fuse/parameters/userns_mounts: Permission denied

What should I do to be able to get FUSE running in an unprivileged 
container?

More info:

Host is Debian Stretch, 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1+deb9u1 
(2018-05-07) x86_64 GNU/Linux

LXC and LXC are both at version 3.1, via snap

The /dev/fuse node exists in the guest:

crw-rw-rw- 1 nobody nogroup 10, 229 May 23 11:54 /dev/fuse

In the parameters directory on the host I have:

ls -la /sys/module/fuse/parameters/
total 0
drwxr-xr-x 2 root root    0 Jun 23 22:58 .
drwxr-xr-x 6 root root    0 Jun 23 22:58 ..
-rw-r--r-- 1 root root 4096 Jun 23 22:58 max_user_bgreq
-rw-r--r-- 1 root root 4096 Jun 23 22:58 max_user_congthresh




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