So are you telling, your ds-389 isn't responding to simple ldapsearch for instance, even if there is no huge amount of logins to hosts? Just from refreshing cache on host clients? But if you doesn't have sssd (that do kernel-caching of privileges), therefore all your clients every time doing ldapsearch or something like this against ds-389 (but I could be wrong).
Though I think ldap is really fast and could stand for thousands of requests.
What access and errors logs of DS showing you?

2017-12-11 21:52 GMT+03:00 Aaron Hicks <aaron.hicks@nesi.org.nz>:
Hi Andrew,

I’m afraid it’s often happening during the initial population if the cache. Also these host are all LDAP only and caching with nscd, as they only need user and group name resolution. This was done to minimise changes to their software image as they’re stateless/diskless hosts.


From: Andrew Radygin <randrewg@gmail.com>
Sent: Monday, December 11, 2017 7:54:45 PM
To: FreeIPA users list
Cc: Aaron Hicks
Subject: Re: [Freeipa-users] FreeIPA connection limits?
 
Does sssd caching of privileges is working?
I mean, suppose if there is no reply from IPA-server, it should use local cache for existing users.

2017-12-11 0:08 GMT+03:00 Aaron Hicks via FreeIPA-users <freeipa-users@lists.fedorahosted.org>:

Hello the list,

 

We’ve got a number (hundreds) of hosts inside a private network, these all query the FreeIPA server for user and group information using NAT and a gateway server.

 

However we’re having issues with the LDAP queries timing out or becoming unresponsive.

 

Is there a limit on the number of concurrent connections from a single host (e.g. the NAT gateway)?

 

Is there a way of increasing the number of simultaneous connections to FreeIPA/dirsrv?

 

Regards,

 

Aaron


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Best regards, Andrew.



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Best regards, Andrew.