May 2011 - Roundtable

book xylophone
by Trevor Cordes 12 May '11

12 May '11

A xylophone made of O'Reilly books! http://www.buzzfeed.com/sgtdopushups/book-xylophone-21dz

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IPv6
by Sean Cody 12 May '11

12 May '11

Anyone have an interest or are is implementing ipv6 anywhere? An intro to ipv6 would be a great presentation topic so if you can share your experience, please do! It's been on my someday/maybe list forever and will continue to be until continue to be until you help (or an employer makes me learn)! Any takers? Pretty please? -- Sean (mobile)

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Re: [RndTbl] xfs inode adjust?
by Adam Thompson 12 May '11

12 May '11

Seriously? You're worried about the space inodes will take on a TWELVE TERABYTE file system? What amount of disk space (%) could this actually save? Is it really worth worrying about today? I guess I could see it if it's going to waste >1Gb, if only to save time during the mkfs process... -Adam Trevor Cordes <trevor(a)tecnopolis.ca> wrote: >I'm making (as we speak) a 12TB RAID6 array, using XFS. My first >attempt I noticed XFS was making waaay too many inodes. I know in ext3 >I can adjust the inode count, like # bytes per inode, etc. Does anyone >know how to do the same in XFS? Man xfs is super confusing on inode >count manipulation. I have no idea what numbers it wants in its >parameters. > >Since my fs has mostly large (2-4GB) files, I like to reduce the inode >count by 1-3 orders of magnitude from the defaults to give me more >usable space. > >Thanks! >_______________________________________________ >Roundtable mailing list >Roundtable(a)muug.mb.ca >http://www.muug.mb.ca/mailman/listinfo/roundtable >

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xfs inode adjust?
by Trevor Cordes 11 May '11

11 May '11

I'm making (as we speak) a 12TB RAID6 array, using XFS. My first attempt I noticed XFS was making waaay too many inodes. I know in ext3 I can adjust the inode count, like # bytes per inode, etc. Does anyone know how to do the same in XFS? Man xfs is super confusing on inode count manipulation. I have no idea what numbers it wants in its parameters. Since my fs has mostly large (2-4GB) files, I like to reduce the inode count by 1-3 orders of magnitude from the defaults to give me more usable space. Thanks!

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RAIDing swap
by Trevor Cordes 11 May '11

11 May '11

Further to last night's discussion: I always RAID1 swap when I do RAID1 setups. If you don't RAID your swap, and 1 disk dies, and any swap space is being used, then your system *will* crash when it next does a page-in from swap. It may even crash on the next page-out. RAID1 on swap increases your uptime and survivability substantially. If all you care about is data integrity and don't care about uptime and a crash/reboot cycle (ie: a simple home machine), then yes, not raiding swap would be acceptable. You would gain a performance advantage.

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printers needing a good home
by Adam Thompson 09 May '11

09 May '11

Free for the asking: 1 x HP LaserJet 4ML – last reported to be working fine, but no toner left 1 x Epson CX4800 (scan+print) – some ink left, but rear feed roller needs cleaned I won’t be at the meeting tomorrow, but they can picked up (or delivered if I’m heading your way) sometime next week. -Adam Thompson athompso(a)athompso.net

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Next meeting
by Robert Keizer 09 May '11

09 May '11

Come one come all, A small heads up that there will be two desktop computers as door prizes tomorrow. Specs below: Standard desktop size. Dual socketed AMD Single Cores, 32bit, 1.8-2.8Ghz 2-4Gb ram. The machines are fully working and are simply lacking a hard drive - be forewarned, these machines do not have SATA on-board. ( Although they do have sata power cables ). All the best, Rob

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Ubuntu mirror security
by Kevin McGregor 09 May '11

09 May '11

I set up a (virtual) machine here at work as a local mirror of ca.archive.ubuntu.com, and was trying to change the VLAN it was on. Security got involved and sent me this: How much testing and vetting of these patches is being performed? I have reservations about placing a server that is downloading open source code over a non-secured connection and allowing it to redistribute said code to basically anything in the Infranet. What assurances can be provided as to the validity and integrity of the downloaded patches? I responded that the process is valid and secure, just like Microsoft WSUS servers. I couldn't find any HTTPS mirrors, so I expect that man-in-the-middle attacks aren't worth guarding against. Security responded with: Is the downloading and validation process done manually, or is the on-site mirror server performing this automatically without user intervention? And the cryptographic signatures you describe, are you referring to MD5 or sha-1 hashes? The packages themselves have MD5, SHA1 and SHA256 hashes, and the repositories are signed with PGP keys. And the latest (is he coming around?): Thank you for the informative links Kevin. >From the apt-secure man If a package comes from a archive without a signature or with a signature that apt does not have a key for that package is considered untrusted and installing it will result in a big warning. apt-get will currently only warn for unsigned archives, future releases might force all sources to be verified before downloading packages from them. How is our implementation setup? Only providing a warning that a package signature could not be verified is worrisome. The entire process also revolves around the complete trust of not only the archives but the entire GnuPG system including the debain-keyrings (which of course closely equate to numerous certificate authorities in the SSL world). As for more of a focus on proper network placement, can you offer up any expected bandwidth numbers not only from the mirror to the Internet, but between all of the servers and the mirror? I'm not looking for exact science here but a rough estimate will allow me to balance performance concerns with those I have as to the security posture of the entire setup. That's the story so far. I just wanted to share this with all y'all. Kevin

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Game developer David Braben creates a USB stick PC for $25 – Video Games Reviews, Cheats | Geek.com
by Gilbert E. Detillieux 06 May '11

06 May '11

A computer running Linux, about the size of a USB stick, for $25... http://www.geek.com/articles/games/game-developer-david-braben-creates-a-us… See also... http://www.raspberrypi.org/ What seems to be missing from the "provisional" spec is some sort of network interface. Curious, since the software includes Iceweasel (a Firefox clone/fork). Anyway, it may be about a year before we see these in production, so a few things can/will change before then. -- 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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UG News: Save 50% - *Free to Choose* Video Deal of the Day
by Gilbert E. Detillieux 05 May '11

05 May '11

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