Re: FreeIPA connection limits?

[Andrew Radygin]

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 :
> 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.
> Get Outlook for iOS https://aka.ms/o0ukef
>
> *From:* Andrew Radygin 
> *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 <
> [e-mail]>:
> > 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
> >
> > FreeIPA-users mailing list -- [e-mail]
> > To unsubscribe send an email to [e-mail]
> > rahosted.org
>
> --
> Best regards, Andrew.

FreeIPA connection limits?

[Aaron Hicks]

Hi Andrew,

Single operations are fine. From the command line names resolve quickly, especially once cached, ldapsearch and other commands work when properly authenticated.

When the hosts behind the NAT process a job, it starts a burst of activity and initiating a large number of LDAP connections (multiple connections per host, about a hundred hosts) to refresh or initialise the credential cache. We’re seeing a large proportion of these initial connections timing out without a response, and the nscd cache not being populated, so then it happens again.

We’re not seeing errors in the FreeIPA or slapd logs either, well nothing that seems to be ‘timeout’ or ‘idle connections’ or ‘connection limit exceeded’ etc.

Regards,

Aaron

From: Andrew Radygin [mailto:[e-mail]] 
Sent: Tuesday, 12 December 2017 8:23 AM
To: Aaron Hicks 
Cc: FreeIPA users list 
Subject: Re: [Freeipa-users] FreeIPA connection limits?

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 <[e-mail]  >:

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.

Get Outlook for iOS https://aka.ms/o0ukef

_____

From: Andrew Radygin <[e-mail]  >
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 <[e-mail]  >:

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

_______________________________________________
FreeIPA-users mailing list -- [e-mail]  
To unsubscribe send an email to [e-mail]

FreeIPA connection limits?

[Gordon Messmer]

On 12/11/2017 01:46 PM, Aaron Hicks via FreeIPA-users wrote:
> When the hosts behind the NAT process a job, it starts a burst of 
> activity and initiating a large number of LDAP connections (multiple 
> connections per host, about a hundred hosts)

That seems like a relatively small number of connections, well within 
the default configuration's capabilities.

Performance tuning for the directory server for Linux is documented here:

http://directory.fedoraproject.org/docs/389ds/FAQ/performance-tuning.html

http://directory.fedoraproject.org/docs/389ds/howto/howto-systemd.html 
(see the last section of this page)

...but be aware that some of these settings are already higher on 
CentOS/RHEL 7 than the documentation suggests.  Check the settings on 
your system before making any changes so that you don't actually impose 
a smaller limit than is currently in place.

FreeIPA connection limits?

[Sumit Bose]

On Tue, Dec 12, 2017 at 10:46:50AM +1300, Aaron Hicks via FreeIPA-users wrote:
> Hi Andrew,
>
> Single operations are fine. From the command line names resolve quickly, especially once cached, ldapsearch and other commands work when properly authenticated.
>
> When the hosts behind the NAT process a job, it starts a burst of activity and initiating a large number of LDAP connections (multiple connections per host, about a hundred hosts) to refresh or initialise the credential cache. We’re seeing a large proportion of these initial connections timing out without a response, and the nscd cache not being populated, so then it happens again.

If there are really that many connections you might overrun the number
of available worker threads. See nsslapd-threadnumber e.g. on
http://directory.fedoraproject.org/docs/389ds/design/autotuning.html how
to change the number, iirc the default is 30.

HTH

bye,
Sumit
> We’re not seeing errors in the FreeIPA or slapd logs either, well nothing that seems to be ‘timeout’ or ‘idle connections’ or ‘connection limit exceeded’ etc.
>
> Regards,
>
> Aaron
>
> From: Andrew Radygin [mailto:[e-mail]] 
> Sent: Tuesday, 12 December 2017 8:23 AM
> To: Aaron Hicks 
> Cc: FreeIPA users list 
> Subject: Re: [Freeipa-users] FreeIPA connection limits?
>
> 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 <[e-mail]  >:
>
> 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.
>
> Get Outlook for iOS https://aka.ms/o0ukef
>
> From: Andrew Radygin <[e-mail]  >
> 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 <[e-mail]  >:
>
> 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
>
> FreeIPA-users mailing list -- [e-mail]  
> To unsubscribe send an email to [e-mail]
>
> --
>
> Best regards, Andrew.
>
> --
>
> Best regards, Andrew.
> FreeIPA-users mailing list -- [e-mail]
> To unsubscribe send an email to [e-mail]