Nice introduction: https://mycodesmells.com/post/introduction-to-vault
Fun write-up: https://www.davidbegin.com/cubbyhole-backend-and-response-wrapping/
Token info: https://www.vaultproject.io/docs/concepts/tokens.html
Cool dev implementation series with OSX and lastpass: https://blog.alanthatcher.io/fun-and-profit-with-vault-2/ https://blog.alanthatcher.io/fun-and-profit-with-vault-part-2/ https://blog.alanthatcher.io/fun-and-profit-with-vault-part-3/
Single-use implementation: https://www.slalom.com/thinking/managing-secrets-using-hashicorp-vault
How-to on Ubuntu: https://www.digitalocean.com/community/tutorials/how-to-securely-manage-secrets-with-hashicorp-vault-on-ubuntu-16-04