With Ubuntu 15.10, the path of the btrfs binary has changed from /sbin/btrfs to /bin/btrfs.
Therefore, I stopped referring to the binary by full path.
While /bin is in the PATH by default on Ubuntu 15.10 (even for cron jobs),
on older Ubuntus or other distros, you may possibly need to
add /sbin or /bin to the PATH for these scripts.
modified: fs/snapshot-rootfs.sh
modified: host/vmhost-status.sh
#!/bin/sh
mount /btrfs
-/sbin/btrfs subvolume snapshot -r /btrfs/@ /btrfs/@-snapshot-$(date +%Y%m%d%H%M%S)
+btrfs subvolume snapshot -r /btrfs/@ /btrfs/@-snapshot-$(date +%Y%m%d%H%M%S)
umount /btrfs
echo
echo BTRFS SUBVOLUMES:
echo
-/sbin/btrfs subvolume list /
+btrfs subvolume list /
echo
echo
echo LXC CONTAINERS: