Sometimes it happens that vagrant hangs during boot of your virtual image. Right after typing:
Unfortunately the Linux DNS resolver has no direct support for detecting and doing failovers for DNS servers. It keeps feeding requests to your primary resolving nameserver, waits for a configured timeout, attempts again, and only then tries the second nameserver....
I recently had an annoying encounter with the error message: Too many authentication failures for root. I found out this can be caused because you've hoarded too many SSH keys :)
If something weird is happening, you want to know everything that's going on on a server, as fast as possible.
"Simplicity is prerequisite for reliability."