October 2003 - wlug - list.wlug.org.nz

Re: [wlug] "Too many open files" error
by Roger 15 Oct '03

15 Oct '03

Thanks for the helpful suggestions. Using the commands you gave me highlight that it is JBoss and the JVM that appear to be using up the resources. However, the "Too many open files" error has now transformed itself into a JVM crashing problem. I have had this problem off and on for a number of months, but it has now reached the point where I can't work around it. I am fairly convinced that it is a resource limitation problem somewhere, but I'm no expert in Linux and am running out of time. The server is on a small network, so I was wondering someone would be prepared to come around and look at it, for an appropriate fee, to see if there was any obvious (to them) problem. Cheers Roger

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Help - Strangeness in a Redhat
by Raymond Burgess 15 Oct '03

15 Oct '03

Hey ppl, I have a couple of strange things happening on my system, if anyone has any ideas on what is cause them please let me know. First, I am running RH 9 on my workstation and have a RH 7.1 box running as a webserver. I mount /home via nfs from the RH 7 box to my workstation. I have noticed that write speeds to /home are very slow, with no obvious reason. If I copy a file from /tmp (local) to /home/raymond (remote) it takes forever, and there is next to no network usage or cpu load. Transfers in the opersite direction saturate the 10MBit connection. I am using the following options for mount: rsize=8192,wsize=8192,intr Any Ideas why writes would be so slow? I have ftp running on the RH 7 box and ftping the data to /home/raymond via ftp runs at fullspeed. Second issue is a also strange, once I reboot I am able to run up2date and any rpm command, so I can install packages but after a day or two for no reason these commands just stop. They hang on execution as if they are waiting for something. You can't stop them with CTRL-C either, you have to kill -9 the process. This means I have to reboot my machine if want to install a new package, which isn't as much of a problem now I have things installed but was initially a pain in the bu when I first built the machine. Any Idea? Thanks, Raymond.

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Re: [wlug] "Too many open files" error
by Roger 14 Oct '03

14 Oct '03

John R. McPherson wrote: >> Roger wrote: >> >>> I am running an application server on Red Hat 8.0 and every so often the >>> machine generates an error message "Too many files open" and then locks >>> up. I have to restart the machine from the console to rectify the >>> situation. Can anyone please tell me if there is some configuration >>> setting that I can change to increase the number of permitted files? Is >>> there some command that allows me to monitor the number of open files in >>> the system? >> >> >> The other reply was for kernel version 2.6-something, but as far as I >> know, under kernel 2.4.x and earlier, there is a hard-coded limit in >> the kernel - /usr/include/linux/limits.h has >> #define OPEN_MAX 256 /* # open files a process may have */ >> (but that is per-process, not in total). >> >> You could install and try the lsof(8) command - I haven't used it >> much, but it stands for "LiSt Open Files", so it sounds like what you >> want :p > >er, no. > >Under 2.4 a process can have a stupidly large number of fd's open, you >need to modify /proc/sys/fs/file-max and perhaps /proc/sys/fs/inode-max >which is the system wide limit, to raise the limit per process you can >use ulimit to raise it above the 256 (default limit) you mentioned above. > >Running out of fd's is a pretty nasty business, what on earth are you >doing to that poor machine? Are you running lots of programs? (like, >hundreds of copies of something?) > That is part of the problem, I am not precisely sure why there are so many files opened. I am running a fairly large J2EE application on JBoss and it seems to load heaps of files into the JVM. I may need to change some settings in JBoss, but that of course is the subject for another forum. Thanks for all the help. Roger

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"Too many open files" error
by Roger 14 Oct '03

14 Oct '03

I am running an application server on Red Hat 8.0 and every so often the machine generates an error message "Too many files open" and then locks up. I have to restart the machine from the console to rectify the situation. Can anyone please tell me if there is some configuration setting that I can change to increase the number of permitted files? Is there some command that allows me to monitor the number of open files in the system? Thanks in anticipation Roger

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Does anyone know anything about "rimuhosting.com"?
by Glyn Webster 12 Oct '03

12 Oct '03

RimuHosting is a web hosting company that does Linux Virtual Private Server hosting. http://rimuhosting.com/ RimuHosting's web page says it is based in Hamilton, but that is all. There are no names are full addresses anywhere on web site. Googling, I found a number of message boards posts promoting rimuhosting.com by someone called "Peter B". I'd feel happier if I knew more about the business than that. Other than that, does it look like good thing? A friend and I plan to run a few low volume websites from something like this. One will be a dynamic one using Apache, Python and PostgreSQL. Will those all run happily under a 64MB RAM? -- Glyn Webster ~ Simplicity Himself. ~ glyn(a)wave.co.nz ~ http://tiddly-pom.com

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Stable Versions of Linux for Applicaiton Servers
by Roger 11 Oct '03

11 Oct '03

I am wanting to set up a production application server using JBoss (written in Java) and PostgreSQL (written in C I believe), so would be interested in opinions as to what the most reliable platform would be for this. Firstly, I am wondering what flavour of Linux is considered the most reliable and what version. I am currently using Red Hat 8.0. Secondly, I am would be interested if people have experience with different JVMs for such a application. Perhaps another way of asking the same question: Are there any platforms or combination of platforms that should be avoided. Cheers Roger

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Linuxjournal back issue CD
by Alastair Porter 10 Oct '03

10 Oct '03

Hi all, I seem to have won a back issue CD from linux journal, so if anyone wants a copy (maybe a few for the library?) give me a buzz and ill run some out when it turns up. Alastair -- (o< - A l a s t a i r P o r t e r //\ V_/_ alastair(a)linuxexperience.com

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OFF-TOPIC: FREE STUFF
by Andrew Thrift ＠ Home 09 Oct '03

09 Oct '03

2x WORKING Synoptic 2803 16 port 10megabit hubs 2x WORKING ATX PSU's 1x WORKING EMACS Hot Swap ATX PSU Chassis (no psu's) 1x DEAD Leo Monitor Must be gone by wednesday or it goes to the rubbish tip.

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Next WLUG Meeting: Anti-Virus and Anti-Spam for Linux (Monday 27 October)
by Craig Box 07 Oct '03

07 Oct '03

Hi everyone, Because I want to see a big "Happy Birthday to me" audience, based on current relevance and suggestions prior to the AGM we're cobbling together a great topic for the next meeting: "Anti-Virus and Anti-Spam E-Mail Filtering on Linux". Suggestions for what to talk about include: * server side filtering options (MailScanner, Amavis, ClamAV & SpamAssassin, probably presented in a "How To" format with Debian Woody, Exim and Courier IMAP) * client side filtering (how bayesian filtering works, Mozilla Mail's implementation, plugging SpamAssassin into Evolution or Kmail) Since I've been doing this at work lately, I don't mind presenting it (and might even drag Greig into it too), unless anyone else would specifically like to. Seeing there are a lot of new users in WLUG lately, and that it would seem a lot of you start with KDE on Mandrake; can you let me know what email client you use? If you're interested in this topic and can't wait till the meeting, I've put some preliminary notes up at http://www.wlug.org.nz/MeetingTopics.2003-10-27. Craig

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The Hamilton Computer Club meeting is tonight
by Meeting Reminder Bot 07 Oct '03

07 Oct '03

The The Hamilton Computer Club meeting is tonight This is an announcement about the Hamilton Computer Club, not the next WLUG meeting. Feel free to ignore it. If you're interested in the Computer Club, they meet about 7:30pm on the second Wednesday of each month at St Peters Cathedral Hall which is up the hill at the South End of Victoria Street. For further details, see http://www.hamiltoncomputerclub.co.nz/

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