The importance of the order in domain controler names for setting an LDAP server, is there any reason? I wonder if there is any reason to speficically put the domain controlers in the proper order, when configurung a LDAP server using autofs. For example if specify on a RedHat/CentOS the dc domain controlers in this order : ou=example, dc=hostname1,dc=people the LDAP is active and I may see it. But if by a simple "mistake" I write ou=people, dc=hostname1,dc=example I do not see any mounted LDAP server, what it is exactly the meaning of the ou and dc domain names and where I could look to see which order I have to follow.

You can think of LDAP as a tree (example). Thus, `ou=example,dc=hostname1,dc=people` will traverse the tree starting at the root `dc=people` and passing its child `dc=hostname1` before arriving at `ou=example` as a child node of `dc=hostname1`.

If you mix that order LDAP isn't able to traverse the tree. In your second example it will struggle finding the root element `dc=example` and you'll just get a message telling you that there is no such path in your directory tree. (check your logs.)