title: How to add functionality to Spring Cloud Bootstrap
body: <p>I want to add some lookup before the Spring context is loaded, which is ideally on the bootstrap phase of Spring Cloud (When it lookup for Configuration Server, Cloud connectors etc). How can I make my code to be executed on that phase ?</p>
  
  <p>What I want to do is query <a href="https://hashicorp.com/blog/vault.html" rel="nofollow">Vault</a> to get all my databases secrets and api keys and set the properties, I know I can encrypt with Spring Cloud Config, but I liked the strong box of Vault. (The integration with Vault part I can handle) </p>