Added " How to maintain tight control over the number of active users on your GitLab installation" to documentation

doc/raketasks/user_management.md

@@ -47,3 +47,38 @@ sudo gitlab-rake gitlab:import:all_users_to_all_groups
 # installation from source
 bundle exec rake gitlab:import:all_users_to_all_groups RAILS_ENV=production
 ```
+
+## Maintain tight control over the number of active users on your GitLab installation
+
+- Enable this setting to keep new users blocked until they have been cleared by the admin 
+
+```bash
+(default: false).
+block_auto_created_users: false
+
+Base where we can search for users
+
+Ex. ou=People,dc=gitlab,dc=example
+
+base: ''
+
+Filter LDAP users
+
+Format: RFC 4515 http://tools.ietf.org/search/rfc4515
+Ex. (employeeType=developer)
+
+Note: GitLab does not support omniauth-ldap's custom filter syntax.
+
+user_filter: ''
+```
+
+- GitLab EE only: add more LDAP servers
+
+```bash
+Choose an ID made of a-z and 0-9 . This ID will be stored in the database
+so that GitLab can remember which LDAP server a user belongs to.
+uswest2:
+label:
+host:
+....
+```