Note that hostname can be a space-separated list of LDAP host names. This is very useful for failover; if the first ldap host is down, ldap_connect will ask the second LDAP host. Of course, you _must_ have LDAP replicates before doing this. :) Read the LDAP API documentation for more information.
This can also be useful, apart from failover, for LDAP load balancing. Just use a random generator function that will return a different space-separated list every time. This is because the first host in the list is always tried first.
Be careful when doing LDAP writes; be sure to always connect to your master host when you are about to modify the database, so that the replicates will get the changes as expected.
Alexandros Vellis
