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On 09/13/2012 09:54 AM, David Fitzgerald wrote:
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<p class="MsoNormal">Hello Everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I work at a small university and I deployed
freeIPA on my Linux network over the summer break with no
(known) problems, and everything worked as expected.
However, now that the semester has started and the Linux
system is under a much higher load, I am noticing that my
client machines will randomly slow to a crawl. For example, I
have a lab of 25 machines. The students can log in ok, but
after a time, a few of the machines will freeze so that the
users on those machines cannot do anything. After a few
minutes, the frozen machines will unfreeze, but other machines
will freeze up. I can’t see any pattern to what machines
freeze up. I did not have this problem when running NIS, so I
suspect it is something in freeIPA but I am not sure what to
look for to solve the problem. Probably a setting somewhere
needs tweaked but I don’t know. The server and clients all
run Scientific Linux 6.2.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can anyone help me troubleshoot this?</p>
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<br>
Do you use SSSD as a client or something else?<br>
<br>
If SSSD we would need the nsswitch, pam, krb5.conf, sssd.conf
configuration files and SSSD logs set to debug_level=8 or 9.<br>
<br>
What operation they are freezing on? Is it login/authentication or
just suddenly, which probably indicates identity lookup.<br>
So freezes might be related to the DNS or name resolution lookups
that those machines do. They might be accessing a DNS server that is
down or misconfigured before failing over to a correct one.<br>
<br>
So resolve.conf, /etc/hosts would be helpful.<br>
But you might need to check the DNS configuration yourself.<br>
<br>
<br>
HTH<br>
<blockquote
cite="mid:73D5696F6096F9478FA4CA43E2FD99B9B958FFC8@mail6.millersville.edu"
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<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dave<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">+++++++++++++++++++++++</span><span
style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">David
Fitzgerald</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Department
of Earth Sciences</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Millersville
University</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Millersville,
PA 17551</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Phone:
717-871-2394</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<pre wrap="">_______________________________________________
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</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Thank you,
Dmitri Pal
Sr. Engineering Manager for IdM portfolio
Red Hat Inc.
-------------------------------
Looking to carve out IT costs?
<a class="moz-txt-link-abbreviated" href="http://www.redhat.com/carveoutcosts/">www.redhat.com/carveoutcosts/</a>
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