It sounds very exciting. But, the first example made me flinch: $ vault write secret/foo value=bar Don't ever pass passwords on the command line. On linux, other users can see your command line (ps aux), and it usually ends up in a shell's history file.
Honestly, I dislike the approach. I don't want to tell my mysql and my webapp .
I want to tell the system
I don't need to know the password my application uses to access the database. I don't WANT that password. No human should ever see this password. And heck, if the system wants to, just swithc passwords every 60 minutes. I don't want to care.