Recently we had a cloudvirt host that had a fuse mount as follows
$ sudo mount | grep /mnt /dev/fuse on /mnt type fuse (rw,nosuid,nodev,relatime,user_id=0,group_id=0) $ sudo lsof /dev/fuse COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME guestmoun 1395696 root 3u CHR 10,229 0t0 282 /dev/fuse $ ps -ef | grep guestmoun root 1395696 1 2 Feb23 ? 02:37:10 guestmount -a /var/lib/nova/instances/7498566a-c160-4d7d-90eb-03470e5d80f3/disk.1677097630 -i --ro /mnt
As nrpe is ran as the nagios user it received DISK CRITICAL - /mnt is not accessible: Permission denied error
I think we should either skip fuse mounts from this check or update the nagios and nrpe checks so they can run as root. i think im leaning to the former as the better solution as i dont think we need to error if a fuse mount is running out of space but perhaps im missing something