November 2012 - Roundtable

SpamAssassin false positives on DATE_IN_FUTURE_96_Q?
by Gilbert E. Detillieux 23 Feb '16

23 Feb '16

I mentioned this problem at the last round-table session, but didn't get a solution, so I thought I'd post it here, just in case anyone has any suggestions to offer. I'm still seeing a whole bunch of false positives in SpamAssassin, since an update was installed in mid-September on a CentOS 5.7 system, for a rule called DATE_IN_FUTURE_96_Q, which is only supposed to be triggered when the "Date:" header has a date that is 4 days to 4 month ahead of the date in the "Received" header that has the _smallest_ difference in date. Here are the headers from the latest e-mail I've received with this false-positive. (I've stripped out irrelevant headers, for the sake of clarity and simplicity.) From topfivestories(a)messagent.itworldcanada.com Mon Nov 14 07:50:13 2011 Received: from mail.messagent.itworldcanada.com (mail.messagent.itworldcanada.com [207.112.10.80]) by palladium.cs.umanitoba.ca (8.13.8/8.13.8) with SMTP id pAEDoAxV028594 for <gedetil(a)cs.umanitoba.ca>; Mon, 14 Nov 2011 07:50:12 -0600 Date: Mon, 14 Nov 2011 08:50:13 -0500 X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,DATE_IN_FUTURE_96_Q, HTML_MESSAGE,RP_MATCHES_RCVD autolearn=no version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on palladium.cs.umanitoba.ca Note that I'm calling spamd via the spamass-milter on a system running sendmail. Note also, that in the above example, the only "Received" header was the one generated by my own server. (I've had other false positives, however, with multiple "Received" headers, all of which were within seconds of the time in the "Date" header.) Any ideas? -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ PO Box 130 St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

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ATX power supply
by Kevin McGregor 05 Dec '12

05 Dec '12

Does anyone have a spare ATX power supply? Mine seems to have a problem. Specifically, when I run the CPUID Hardware Monitor, it reports these voltages: [image: Inline image 1] The numbers for -12V concern me. :-) The columns are Current/Min/Max, respectively. So if you have a power supply that's taking up space that you'd like to reclaim, please let me know and bring it to the next MUUG meeting. As it happens, I'll be bringing some valuable (I hope) hardware items to the meeting as free giveaways. I sure hope there are some takers! Kevin P.S. If the image inserted above doesn't show up due to filtering en route, the -12V reading is around -6.21V. I'm using the system as we speak, so I guess the -12V line doesn't do much that I regularly rely on, though I have experienced some system oddness lately which may well be explained by this.

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linux not caching files very long
by Trevor Cordes 05 Dec '12

05 Dec '12

My main box has 8GB RAM. There's usually 3GB of programs running. The rest usually is shown as free or going to buffers/cache. I have a set of files I often linearly scan through and they are around 1GB. They used to read in and stay cached for hours (I can tell because my scan takes 3s when cached and 90s when not!). Now they seem to get dropped and require re-reading all the time, like if I don't use them for a few minutes. AFAICT my ps load has not changed and I'm not doing anything that is requiring more cache/buffers that is pushing them out. This seems to have started when I upgraded my kernel from 3.4 to 3.6 (Fedora 16) though I can't be sure at this point. Does anyone know of some tunables I can try to tell the kernel to be more likely to cache for longer? I'd rather cache at the expense of pushing more programs to swap (I run a zillion programs at all times and never close them). I have played with /proc/sys/vm/swappiness (80 has been great for me in the past) but a) it doesn't seem to affect my problem now, and b) the docs leave me scratching my head about how it really affects file caching. At this point I'm not interested in solutions that are "rethink your scan!" as I do plan to one day database-itize and index the 1GB data set... but not today!

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UG News: Save 50% on All Ebooks & Videos - Cyber Monday Only
by Gilbert E. Detillieux 26 Nov '12

26 Nov '12

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socket 775 motherboard
by Kat 25 Nov '12

25 Nov '12

Anyone have a socket 775 motherboard I could borrow to troubleshoot a problem.... and possibly buy, if mine turns out dead? -- ------------------------------------------------------------ Katherine Scrupa Network Technology CCNA, Hons.

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Upstream vendors can harm small projects: OpenBSD dev
by Adam Thompson 23 Nov '12

23 Nov '12

http://www.itwire.com/business-it-news/open-source/57589-upstream-vendors-c… Interesting interview with Marc Espie, the ports maintainer for OpenBSD. -Adam

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ThinkPad X300 battery FS
by Trevor Cordes 22 Nov '12

22 Nov '12

If anyone has an X300 or X301 and needs a brand new battery, email me back. I got stuck with an extra and would sell at a big discount. Thanks

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Re: [RndTbl] resizing an SD card image?
by Adam Thompson 21 Nov '12

21 Nov '12

One thing you can *sometimes* do is write the smaller image to the card, then use gPartEd (or similar) to increase it. -Adam Grigory Shamov <Grigory.Shamov(a)ad.umanitoba.ca> wrote: >Hi, > >Any easy way to resize a bootable image for SD card? There are ready Linux >images for booting on Android devices, like MK802. The problem is, 1) >sometimes you don't have a card for that size (say 4Gb image, 8Gb card) or >2) micro-SD card come in random sizes, so an image for 8Gb card can be >some kbytes too long for a 8Gb card of another vendor. > >I probably could mount the image, copy the contents and go over the >process of creating a bootable image myself. But is there a way of doing >it with a lesser effort? > >-- >Grigory Shamov > >HPC Analyst, Westgrid/Compute Canada >E2-588 EITC Building, University of Manitoba >(204) 474-9625 > > > > >_______________________________________________ >Roundtable mailing list >Roundtable(a)muug.mb.ca >http://www.muug.mb.ca/mailman/listinfo/roundtable

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time off by 1 hour
by Trevor Cordes 20 Nov '12

20 Nov '12

I have a rarely-on (media player) linux box that since the daylight savings changeover (I think) always boots with the time off by 1 hour. (I think it thinks it's 1 hour later than it really is.) It's a modern(ish) Fedora 16 with the latest updates. I can set the clock correctly manually or with ntpdate and all is fine until reboot. Then it's wrong again. I am running ntpd on it to set the clock using my own internal ntpd server that does keep correct time. I did check that the timezone was set to Americas/Winnipeg and the daylight savings stuff all looks correct. I use "system clock is set to GMT". Such a silly problem, and I'm stumped!

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resizing an SD card image?
by Grigory Shamov 20 Nov '12

20 Nov '12

Hi, Any easy way to resize a bootable image for SD card? There are ready Linux images for booting on Android devices, like MK802. The problem is, 1) sometimes you don't have a card for that size (say 4Gb image, 8Gb card) or 2) micro-SD card come in random sizes, so an image for 8Gb card can be some kbytes too long for a 8Gb card of another vendor. I probably could mount the image, copy the contents and go over the process of creating a bootable image myself. But is there a way of doing it with a lesser effort? -- Grigory Shamov HPC Analyst, Westgrid/Compute Canada E2-588 EITC Building, University of Manitoba (204) 474-9625

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