1. keyfiles内部验证
https://docs.mongodb.com/manual/core/security-internal-authentication/#keyfiles

2. 使用keyfile进行复制集之间的验证
https://docs.mongodb.com/manual/tutorial/enforce-keyfile-access-control-in-existing-replica-set/

3. 用户权限规矩
https://docs.mongodb.com/manual/reference/built-in-roles/#built-in-roles