How to Limit Number of LDAP Connections (MTA, Imapd, MMP) ? (Doc ID 2513638.1)

Last updated on JULY 29, 2022

Applies to:

Goal

How to limit number of LDAP connections (MTA, imapd, MMP) ?

When the LDAP service has a performance problem, the mail server opens more LDAP connections.

For a momentary increase in load, that might make sense.  However, when the LDAP server has a real performance problem, continuing to create more connections to the LDAP server only makes a bad situation worse.  And more worse, the LDAP team looks at the number of connections from the mail servers and points to that as a cause.

It is absolutely a symptom and not a cause, but making everyone understand that is... problematic.

We need to be able to set an upper bound on the number of connections to the LDAP server.

The tcp_smtp_server processes would only be using LDAP for a portion of an SMTP transaction.  So the number of LDAP connections are not necessarily the same as the number of SMTP connections.

If LDAP is slow, we would wish to set a ceiling on the number of LDAP connections from each tcp_smtp_server process.

Is there a way to make ldappendingoplimit apply to the MTA processes ?
 

Solution

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