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I have 2 mail servers of the same configuration which is as follows:

  • OpenLDAP (for authntication of users)
  • Postfix
  • Cyrus-imapd
  • SOGo(groupware)

One of them (Let's say X) is in production and is the primary mail server. The other server (Let's say Y) has the exact same configuration as X - the same directory structure, the same users, same postfix and cyrus configuration. I want to know a way to make this a backup mail server, where:

  • if the user changes his/her password (or any LDAP relates field like designation or whatever) in X, it changes in Y too.
  • the mailboxes for each users syncs periodically between X and Y

Possible Solutions:

  • for the second requirement, I was thinking of writing a shell script which invokes a service like imapsync and then syncs. Set a cron job for this. However, I don't know if that is the optimal way to do it. And, in my mind, this is ok only when the number of users are less; if they number in thousands, would this be feasible? (I was also thinking maybe there is a way where when X receives a mail, maybe I could configure Postfix to send it to Y)

  • As for the first question (LDAP), I've read something about LDAP replication w.r.t slurpd and syncrepl but don't know which to use or whether it is really suited my needs.

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up vote 0 down vote accepted

It sounds like you are trying to build a failover cluster. Consider using something like drbd ( to keep the disk data replicated and pacemaker ( to manage the cluster resources.

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Thanks for the suggestion. I'll definitely look into it. – i.h4d35 Aug 12 '13 at 5:32

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