June 2006 - WLUG - wlug.mailman3.com

Filesystem usage
by Mike Perry 14 Jun '06

14 Jun '06

Hi there, I am curious on some statistics and I was wondering you could help me out. I'm wondering what the output of the following command is on your system: root@chao:/tmp# cd / root@chao:/# du --max-depth=1 -h 4.2M ./bin 253K ./dev 36M ./etc 336M ./lib 0 ./mnt 436M ./opt 0 ./srv 18K ./tmp 0 ./sys 743M ./var 3.8G ./usr 38M ./boot 22G ./home 900M ./proc 9.0M ./sbin 4.5M ./root 0 ./media 0 ./initrd 28G . The system I ran on above is an ubuntu desktop machine that hasn't been rebuild in over a year closer to a year and half. For comparison a relatively stock ubuntu machine I have looks like: 4.4M ./bin 103K ./dev 12M ./etc 167M ./lib 0 ./mnt 0 ./opt 8.0K ./tmp 0 ./sys 209M ./var 1.6G ./usr 19M ./boot 2.3M ./home 513M ./proc 9.9M ./sbin 260K ./root 0 ./media 0 ./backup 0 ./initrd 2G . Thanks, Mike

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Anyone actually using SPF and SRS in a Sendmail production env?
by Dwight A. Ernest 10 Jun '06

10 Jun '06

Is anyone here actually using SPF and SRS in a Sendmail production environment? If so, I'd love to ask a few questions about resources, performance, and real-world experience. Thanks.

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SoC's with USB host
by Jamie Guinan 10 Jun '06

10 Jun '06

To follow up on discussion about USB capabilities, I took a quick look at which platforms support USB host (so you can plug webcams, etc. *into* it), $ cd linux-2.6.16 $ find . | grep ohci ... ./drivers/usb/host/ohci-s3c2410.c [ Samsung ARM 920T ] ./drivers/usb/host/ohci-sa1111.c [ StrongARM(SA1110) companion Chip ] ./drivers/usb/host/ohci-lh7a404.c [ Sharp ARM920T ] ./drivers/usb/host/ohci-ppc-soc.c [ Various PowerPC (Freescale) ] ./drivers/usb/host/ohci-au1xxx.c [ AMD (formerly Alchemy) MIPS Au1000 ] ./drivers/usb/host/ohci-pxa27x.c [ XScale ARM (successor to SA1110] ... Those modules are thin hardware-specific glue around the main ohci/usb kernel code. I think the gumstix is a pxa25x, and only the 27x supports USB host. Development boards for a lot of these are priced rather high for the typical hobbyist budget, from a few hundred $$ on up, http://www.embeddedplanet.com/products/sbc.asp http://dkc3.digikey.com/PDF/T062/0378.pdf http://www.hitechglobal.com/boards/ARM920T.htm It looks like Gumstix and routerboard are the cheapest available products in this class. And they're great, but hopefully in the we'll see more things aimed at hobbyists, with USB host capability. -Jamie

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Problem with usermod
by Chuck Noyes 04 Jun '06

04 Jun '06

Hi All, I'm running ubuntu (brezzy), and I just shot myself in the foot.... I went to add my username to a new group, but forgot to include the other groups that I belong to in the command. The command I used was 'sudo usermod -G <new-group> <my-username>'. Now I only belong to <new-group>. That removed my username from the other groups I belonged to, including the admin group. Is there a way undo what I did? I do have a copy of /etc/group before the change. Thanks, -Chuck

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dhcpd question
by joel d 03 Jun '06

03 Jun '06

>Date: Wed, 31 May 2006 20:50:40 -0400 >From: Eric Martin <freak4uxxx(a)gmail.com> >Subject: [Wlug] dhcpd question >To: Worcester Linux Users Group <wlug(a)mail.wlug.org> > >Does anybody know how to block a specific mac address from getting a >dhcp addres in isc dhcpd? I know I can do it with ip tables, and I >know that they will still be able to set a static ip, but I need to do >it this way. I have the notion I need to use pool, and set a known >host and then deny, but I can't get it right. Any help would be >appreciated. > >Eric Did you possibly try googling on DHCP and MAC? I know this answer is out there as I have successfully googled it before. Any help past that would require doing it for you (and $$). Joel

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Children Computer Camps
by Yury I Vashugin 03 Jun '06

03 Jun '06

Does anyone know any computer camps for children in Worcester-Boston Area? Thank you.

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BarCamp: The great unconference
by Brian Waite 02 Jun '06

02 Jun '06

Everyone has probably heard of this already, but it is a very interesting concpet. June 3-4 in Maynard is barcamp Boston. it is a conference held by the attenees. THe web page explains it best. I can't see it not being a good time. http://barcamp.org/BaCampBoston Thanks Brian

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Ad-Hoc Open Source conference "of, for, and by the programmers"
by Chuck Anderson 02 Jun '06

02 Jun '06

This looks like a really cool idea. http://www.boxesandarrows.com/view/an_open_source_conference_barcamp It was brought up on the Fedora Marketing list to see what people think of it for the next Fedora Users and Developers Conference (FUDcon).

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dhcpd question
by Eric Martin 02 Jun '06

02 Jun '06

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Does anybody know how to block a specific mac address from getting a dhcp addres in isc dhcpd? I know I can do it with ip tables, and I know that they will still be able to set a static ip, but I need to do it this way. I have the notion I need to use pool, and set a known host and then deny, but I can't get it right. Any help would be appreciated. Eric -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) iD8DBQFEfjngaI8VEtSi4H8RAhgrAJwOaRJyQZAQsr0OGa23dCAUOgV9pwCeKNEw c4TFkAL+y/V9OzFGvF46wnw= =EKUv -----END PGP SIGNATURE-----

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Booting Mepis from USB cd rom
by Sean Flynn 01 Jun '06

01 Jun '06

Just acquired a new laptop that doesn't have an internal cd rom drive, just a "d-bay" usb cd drive. I had been using Mepis on my previous laptop, and I enjoyed it. But the Mepis Live CD chokes when I try to boot from it. The cd does boot in other pcs, so the media is good. I checked my bios boot settings, but I can boot Knoppix and Ubuntu live cds. I figure that to get other Mepis booted there must be a cheat code I can pass, but my little bit of googling didn't help. Couldn't find anything on the Mepis forums either. Could anyone explain what's going on, or point me somewhere for more knowledge on it. I'd like to understand more how a live cd boots and what the difference between a usb cd and an internal cd rom drive are.

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