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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