Roundtable

roundtable@muug.ca

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2617 discussions

Re: [RndTbl] Tips for isolating causes of system load
by John Lange 13 Feb '05

13 Feb '05

Thanks Sean. Based on that tip (I hadn't realized that "apachectl fullstatus" outputs to stdout) I have come up with just about the ugliest bash script every written! But it works... This takes the top 5 most CPU intensive processes and looks for the ones owned by the "www" user. It then re-greps for that process id so it can spit out the entire line from "ps". Then it also greps "apachectrl fullstatus" for the same PID so we can see what that process is actually doing. If this doesn't make you bash scripters out there cringe I don't think anything will... ;) --- for PID in `ps -weo pid,%cpu,user,args --sort %cpu |tail -n5|grep www|cut -f1 -d " "`; do ps -weo pid,%cpu,user,args --sort %cpu |grep -v grep|grep $PID ; apachectl fullstatus |grep -A1 $PID; done --- The obvious problems with this are: - It invokes way to many processes (some of them more than once) - loops through "fullstatus" every time. The only other problem is that lynx truncates the longer request lines at 80 columns so you are missing part of what the client is requesting that is causing the load. If anyone has some suggestions for how to clean that up please feel free to suggest them. I'm actually a bit dismayed that Apache doesn't have better command line tools for querying the status of the server. John On Sat, 2005-02-12 at 13:47, Sean Cody wrote: > > Anyone have any suggestions for a little bash script that could do this > > auto-magically? > > 'apachectl fullstatus' seems to work alright for me. Not immediately > as intuitive but it does work.

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Tips for isolating causes of system load
by John Lange 12 Feb '05

12 Feb '05

Does anyone know of a way from the command line to find out what specific apache process is doing? This needs to be something that could work in an automated way. Background: We sometimes have certain apache processes go out of control and consume too much CPU. The reason for this varies. Sometimes its users trying to write their PHP or Perl scripts or run some other process and some times its outside "attacks". For example, today we had to block a japanese robot that was written by a comp-sci class because it was attempting to index every day, of every month of every year of a users entire events calender. It was at the year 2015 and climbing before we stopped it. At the moment I can use top or ps to find out which process ID is causing the load and then view apache's /server-status/ to see which page requests are causing the issue. This is great except its a manual process and I can't always get to the console in time to identify the culprit. Anyone have any suggestions for a little bash script that could do this auto-magically? -- John Lange

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How does umask really work?
by John Lange 10 Feb '05

10 Feb '05

The documentation and examples on umask state that you provide a mask that is subtracted from rwx (777) access to generate a default access for newly created files. It clearly doesn't work this way. If you have a umask of 022, newly created files are rw-r--r-- (644). It should be rwxr-xr-x (755). The umask is acting like its 033 and indeed changing it to 033 has no effect on newly created files. However, umask effects directories differently. umask 022 will create directories as expected (as 755), and umask 033 will create them as 644. So how do you set a umask that will create files as 755? -- John Lange

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internet security appliances
by Brock Wolfe 09 Feb '05

09 Feb '05

I have been looking at a router/firewall upgrade to an "internet security appliance" (ISA) for a small business to expand capavility for remote VPN access, VoIP, NAT/PAT, multi host DMZ, support for desktop videoconferencing configurations, etc. Net search points to Sonicwall, ZyXEL/Zywall and on high end Cisco.. . So far Zywall 70 seems closest fit to functions/features allowing some room for user growth. Any comments/suggestions on experiences with ISAs? Thanks iun advance for any comments. Brock Brock Wolfe ______________________________________ Expect problems and eat them for breakfast. -- Alfred A. Montapert (American Author) ______________________________________

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MUUG Meeting web page updated...
by gedetil＠cs.umanitoba.ca 09 Feb '05

09 Feb '05

Howdy folks! As some of you requested, I've updated the MUUG meetings web page to include a link to my "phantogram" web page. You can view the updated meeting description here... http://www.muug.mb.ca/meetings/04-05.html#feb Thanks again, Steve, for providing the equipment and the popcorn for our "movie night". See you all at next month's meeting! -- Gilbert E. Detillieux E-mail: <gedetil(a)cs.umanitoba.ca> Dept. of Computer Science Web: http://www.cs.umanitoba.ca/~gedetil/ University of Manitoba Phone: (204)474-8161 Winnipeg, MB, CANADA R3T 2N2 Fax: (204)474-7609

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Re: Roundtable Digest, Vol 2, Issue 4
by Michael Boyd 07 Feb '05

07 Feb '05

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Offtopic plea for help
by Kevin McGregor 06 Feb '05

06 Feb '05

This is not at all a Unix question, but I don't have any better ideas. I have a Pioneer DV-343 DVD player, and it works fine with CDs, but when I pop in a movie DVD, I get no sound. The picture plays fine. It *used* to play the sound, but I want to be really sure this player is defective before I buy another one. I have another DVD player which plays just fine through the exact same connection to my Yamaha 5.1 Dolby Digital receiver. So, does anyone have a home theatre system and want to try plugging in my DVD player to it and see if they can wrestle some sound out of it? The DVD player has stereo, S/PDIF coax and S/PDIF fibre outputs. It should be easy to pop it in place of your current player. I can bring it to the meeting on Tuesday if there are any takers. Thanks, Kevin -- Kevin McGregor 9-1120 Dorchester Ave. Winnipeg MB R3M 0S4 kmcgregor(a)shaw.ca

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USENIX'05 Conference, Apr 10-15, Anaheim, CA (fwd)
by gedetil＠cs.umanitoba.ca 03 Feb '05

03 Feb '05

The following was sent to my attention, and I thought it might be of interest to some of you... I'm not affiliated with the conference, and neither is MUUG, so refer to the USENIX web site and contact addresses for more information. -- Gilbert E. Detillieux E-mail: <gedetil(a)cs.umanitoba.ca> Dept. of Computer Science Web: http://www.cs.umanitoba.ca/~gedetil/ University of Manitoba Phone: (204)474-8161 Winnipeg, MB, CANADA R3T 2N2 Fax: (204)474-7609 ====================================================== Register NOW for USENIX'05: the Annual Technical Conference of the Usenix Association at http://www.usenix.org/usenix05/progm. Come to Anaheim this April 10-15 for top-notch tutorials and technical sessions: this is the USENIX Association's 30th Anniversary, and we're celebrating with the strongest lineup of training and technical sessions ever: *** Nearly 40 tutorials, 20 of which are new, featuring: o Rik Farrow leading a hands-on Linux Security Class o Geoff Halprin on the Basic Skill of Troubleshooting o Mark-Jason Dominus conducting a Perl Program Repair Shop o Heison Chak discoursing on VoIP Principles and Practice o Jacob Farmer on Next-Generation Storage Networking (See details at http://www.usenix.org/events/usenix05/training/) *** Four concurrent tracks of Technical Sessions including Invited Talks, a Freenix (BSD/Linux) track, and a Guru track with your favorite academics and industry researchers on such timely topics as: o Spencer Shepler: NFSv4 o Running Virtualized Native Drivers in User Mode Linux o John Ousterhout: Faster Software Builds o IP Network extensions for accessing USB devices o Configuring hardware in a data center based on temperature o Eddie Kohler: DDoS Defense in Practice and Theory o A PC-based Open Source Voting Machine (and paper ballot!) o Surviving Internet Catastrophies (See details at http://www.usenix.org/events/usenix05/tech/) *** Keynote by George Dyson, historian and author of Darwin Among the Machines *** Works-In-Progress Reports (WIPs) and Birds-of-a-Feather Sessions (BoFs) round out a rich week overflowing with presentations, information, and collaboration. *** Conference Reception celebrating the 30th Anniversary of USENIX! --------------------------------------------------------------------------- WHAT: USENIX '05 - Celebrating the 30th Anniversary of the USENIX Association WHEN: April 10-15, 2005 WHERE: Anaheim, CA: Marriott Hotel WHO: Anyone interested in state-of-the-art computing issues WHY: To get to and stay on the leading edge of practical and actionable research and tools HOW: http://www.usenix.org/usenix05/progm --------------------------------------------------------------------------- Five or more people registering together get $100 off per person! Early-Bird Registration discounts end March 21, 2005 -- register NOW for the best pricing at: http://www.usenix.org/usenix05/progm ======================================================

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Linux PVR Project
by Spencer Kuziw 02 Feb '05

02 Feb '05

I remember us having a discussion on linux PVRs a few months back and was wondering how the project was progressing. Are we going to get a MUUG presentation anytime soon? Some quick questions... MythTV or FreeVo? Is it possible to setup multiple capture cards to record 1 TV program while watching another? Any chance of making it work with ExpressVu without their box? thanks in advance. -- The Seed Organization

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MUUG Meeting, Feb 8, 7:30PM -- Revolution OS
by gedetil＠cs.umanitoba.ca 01 Feb '05

01 Feb '05

[Posted to man.unix.general and other news groups] ------ Forwarded Article <ctofk5$5lu$1(a)canopus.cc.umanitoba.ca> ------ From gedetil(a)cs.umanitoba.ca (Gilbert E. Detillieux) The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, February 8. The meeting topic for this month is as follows: Revolution OS Since our scheduled presenter (that would be Shawn) had an unexpected business trip, we will be showing Revolution OS. So bring your popcorn. Revolution OS tells the inside story of the hackers who rebelled against the proprietary software model and Microsoft to create GNU/Linux and the Open Source movement. There are interviews with Linus Torvalds, Richard Stallman, Bruce Perens, Eric Raymond, Brian Behlendorf, Michael Tiemann, Larry Augustin, Frank Hecker, and Rob Malda (from Slashdot). For more information on Revolution OS, visit the website at www.revolution-os.com. The group holds its general meetings at 7:30 PM on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ********************************************************************** Please note our meeting location: The IBM offices, at 400 Ellice Ave. (between Edmonton and Kennedy). When you arrive, you will have to sign in at the reception desk, and then wait for someone to take you (in groups) to the meeting room. Please try to arrive by about 7:15 PM, so the meeting can start promptly at 7:30 PM. Don't be late, or you may not get in. Limited parking is available for free on the street, or in a lot across Ellice from IBM, for $1.00 for the evening. Indoor parking is also available nearby, at Portage Place, for $2.00 for the evening. ********************************************************************** For more information about MUUG, and its monthly meetings, check out their Web server: http://www.muug.mb.ca/ Also note that MUUG maintains two mailing lists, called "muug-announce" and "roundtable". If you're not already on these lists, we encourage you to subscribe now: http://www.muug.mb.ca/mailman/listinfo/ The "muug-announce" list is used for monthly meeting announcements (such as this one) as well as other important announcements of interest to MUUG members. The "rountable" list is meant to be a forum for follow-ups to topics discussed at the meetings, or for round-table-style discussion on other topics that come up between meetings. Of course, for this to be effective, we need to reach a certain critical mass. So, please subscribe, and stay involved! -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ P.O. Box 130, St-Boniface Phone: (204)474-8161 Winnipeg, MB, CANADA R2H 3B4 Fax: (204)474-7609 ------ End of Forwarded Article

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Roundtable