[CentOS] How best to allow users to change Samba passwords?

[Kevin Thorpe]

I was wondering if anyone could advise me on this.

I've got two Samba servers, each using passdb.tdb for authentication. 
All works well, but I've now been asked to let users change their own 
passwords (a requirement of data secuity). What's the best way of 
arranging this, preferably updating both servers at the same time?

thanks