LDAP authentication

Similar to Kerberos authentication, we can also use LDAP in MongoDB Enterprise Edition only.

Setting up a user has to be done in the $external database and must match the name of the authentication LDAP name. The name may need to pass through a transformation and this may cause a mismatch between the LDAP name and the user entry in the $external database. Setting up LDAP authentication is beyond the scope of this book but the important thing to consider is that any changes in the LDAP server may need changes in the MongoDB server; they won't happen automatically.