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Thousands of TIME_WAIT connections with CUPS?
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Thousands of TIME_WAIT connections with CUPS?
by Adam Nielsen-2
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Hi all,
For some reason I'm getting thousands of hanging TCP connections on our server which appear to be caused by Samba sending print jobs to CUPS (or I assume so as nothing else on the machine uses CUPS.) These connections are starting to cause problems (programs monitoring connections start breaking because it takes many seconds for them to scan through the full list) so if anyone has any ideas how to rid the system of these connections I'd be very appreciative! tcp 0 0 127.0.0.1:37256 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38323 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38251 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38495 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38445 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38818 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38748 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38573 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38359 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37863 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37743 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38035 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38961 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38473 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37984 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38804 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37514 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38307 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37991 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38673 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38054 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37808 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37632 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38069 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38464 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37559 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38713 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37998 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38556 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38162 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37566 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37597 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37939 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38599 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38867 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:37502 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38344 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38412 127.0.0.1:631 TIME_WAIT tcp 0 0 127.0.0.1:38691 127.0.0.1:631 TIME_WAIT ... Thanks, Adam. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba |
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Re: Thousands of TIME_WAIT connections with CUPS?
by Michael Wood-8
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2009/11/4 Adam Nielsen <adam.nielsen@...>:
> Hi all, > > For some reason I'm getting thousands of hanging TCP connections on our > server which appear to be caused by Samba sending print jobs to CUPS (or > I assume so as nothing else on the machine uses CUPS.) > > These connections are starting to cause problems (programs monitoring > connections start breaking because it takes many seconds for them to > scan through the full list) so if anyone has any ideas how to rid the > system of these connections I'd be very appreciative! I don't have an answer for your actual question, but if it takes several seconds to get this list, it's probably because of DNS queries, and using "-n" will speed it up dramatically. -- Michael Wood <esiotrot@...> -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba |
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Re: Thousands of TIME_WAIT connections with CUPS?
by Adam Nielsen-2
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> I don't have an answer for your actual question, but if it takes
> several seconds to get this list, it's probably because of DNS > queries, and using "-n" will speed it up dramatically. Thanks for the suggestion. I was actually using "cat /proc/net/tcp" as this is what the monitoring software uses, so there's no DNS lookups there. Just the sheer number of them (and any processing done by the monitoring software) is the cause of the delay. Adding -n when using 'netstat' only shaves off 0.3 seconds, I guess because 99% of them are all "localhost"! But of course the connections shouldn't be there in the first place, so any ideas how to get rid of them would be much appreciated! I am only running Samba 3.2 though, so perhaps the problem will go away when I get a chance to upgrade to 3.4... Cheers, Adam. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba |
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Re: Thousands of TIME_WAIT connections with CUPS?
by Michael Wood-8
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2009/11/5 Adam Nielsen <adam.nielsen@...>:
>> I don't have an answer for your actual question, but if it takes >> several seconds to get this list, it's probably because of DNS >> queries, and using "-n" will speed it up dramatically. > > Thanks for the suggestion. I was actually using "cat /proc/net/tcp" as > this is what the monitoring software uses, so there's no DNS lookups > there. Just the sheer number of them (and any processing done by the > monitoring software) is the cause of the delay. Ah, OK. Then is it possible to get your monitoring software to ignore the 127.0.0.1:631 connections? > Adding -n when using 'netstat' only shaves off 0.3 seconds, I guess > because 99% of them are all "localhost"! > > But of course the connections shouldn't be there in the first place, so > any ideas how to get rid of them would be much appreciated! I am only > running Samba 3.2 though, so perhaps the problem will go away when I get > a chance to upgrade to 3.4... I don't think that will help. See the following: http://www.developerweb.net/forum/showthread.php?t=2941 The diagram there is a bit corrupted from the original ASCII art version (missing sequence numbers etc.), so see figure 13 from here: http://tools.ietf.org/html/rfc793 See also: http://www.developerweb.net/forum/showthread.php?t=5995 http://www.developerweb.net/forum/showthread.php?t=3752 http://blog.port80software.com/2004/12/07/hurry-up-and-time_wait/ -- Michael Wood <esiotrot@...> -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba |
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