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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">No firewall blocking going on. Lookups to the local server freeze entirely, I have not checked when this happened if remote looks ups still worked or not.
I have to kill named when this occurs as it will not voluntarily restart. I even did a strace on named, and there is no activity.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Doesn’t appear to be a lot of network resources in use when it freezes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D">David Gottschalk
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D">UTS Email team<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D"><a href="mailto:david.gottschalk@emory.edu" title="mailto:david.gottschalk@emory.edu">david.gottschalk@emory.edu</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D">404.727.9744<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> mailscanner-bounces@lists.mailscanner.info [mailto:mailscanner-bounces@lists.mailscanner.info]
<b>On Behalf Of </b>Landon Stewart<br>
<b>Sent:</b> Wednesday, January 27, 2010 2:31 PM<br>
<b>To:</b> MailScanner discussion<br>
<b>Subject:</b> Re: Off Topic: Caching Bind Server Freezing<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Jan 27, 2010 at 9:41 AM, Gottschalk, David <<a href="mailto:dgottsc@emory.edu">dgottsc@emory.edu</a>> wrote:<o:p></o:p></p>
<p class="MsoNormal">Does anyone here use Bind to cache DNS lookups on their MailScanner boxes?<br>
<br>
I have a bind caching server running on each of my MailScanner machines, and occasionally named will completely freeze up. I'm not sure why this is occurring. I thought it might have had to do with SpamHaus lookups hanging (they blocked our lookups), so I disabled
them in my <a href="http://mailscanner.cf" target="_blank">mailscanner.cf</a>; however, that has not resolved the issue.<br>
<br>
I'm running version 9.2.4.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
Hi David,<br>
<br>
Are you blocking UDP:53 or TCP:53 with your iptables or upstream? Do any lookups work at all when its frozen (cached or other)? Can you perform lookups using other name servers from the machine? (eg. dig @<a href="http://bitsy.mit.edu">bitsy.mit.edu</a>
<a href="http://emory.edu">emory.edu</a>). When it is frozen what does the output of lsof look like for that process? Are there a lot of network resources in use by the named process when it freezes?<o:p></o:p></p>
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<p class="MsoNormal">-- <br>
Landon Stewart <<a href="mailto:LStewart@SUPERB.NET">LStewart@SUPERB.NET</a>><br>
SuperbHosting.Net by Superb Internet Corp.<br>
Toll Free (US/Canada): 888-354-6128 x 4199<br>
Local and International: 206-438-5879 x 4199<br>
Web hosting and more "Ahead of the Rest": <a href="http://www.superbhosting.net">
http://www.superbhosting.net</a><o:p></o:p></p>
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