Hello. Recently we had a typo[1], which caused BVT random failures. We have a script setting up mcollective configuration file that is called (sequentially) from rc.local after another script, which makes sure that network interfaces are named in an expected way. This typo rendered the renaming procedure slow, leaving mcollective unconfigured for a while. Depending on random events, these events made tests to fail without exposing the root cause in the logs, so it took much time to deal with it. We can possibly avoid such situations by declaring "set -eu" in our bash scripts. It raises two issues: 1. set -u is a bashism; 2. scripts need to be refactored to work with set -eu. [1] https://review.openstack.org/#/c/271748/1/contrib/fuel_bootstrap/files/trusty/usr/share/initramfs-tools/hooks/netifnames