Looking for a centralized secret service to use for a service oriented architecture running on dozens of servers. So far, I'm come across [Keywhiz](https://square.github.io/keywhiz/) (by Square) and [Vault](https://hashicorp.com/blog/vault.html) (by HashiCorp).What is recommend? I don't like that Keywhiz is in Java (bloated and have to install JVM), but I do like that it exposes a FUSE filesystem and implements a cache as well.