July 2013 - luv-main - example.com

iptables-save output using dotted quad netmask rather than CIDR
by Tim Connors 13 Dec '13

13 Dec '13

iptables-save on rhel5 outputs: -A RH-Firewall-1-INPUT -s 12.3.4.5/255.255.0.0 -p tcp -m tcp -j ACCEPT whereas rhel6 outputs -A RH-Firewall-1-INPUT -s 12.3.4.5/16 -p tcp -m tcp -j ACCEPT Wanting to normalise iptables-save to one form or the other (preferably using the dotted quad netmask), the best I can come up with is a line by line grep (for optimisation perhaps, since a match wont happen often) for /<number> and then extract the number, pass to cidr2mask, and replace /<number> in that line (this is part of a self contained shell script that will be executed on the fly on another host, so I'd rather not rely on anything that isn't already in RHEL, ie no writing a perl sript myself unless it's a one liner perl -e thing). What flag to iptables-save am I missing where it does this for me? -- Tim Connors

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Cheap GPL router - $11 from MSY
by Andrew Worsley 15 Oct '13

15 Oct '13

Just got what looks to be a pretty good deal on what appears to have GPL version of the code made available. Got this D-Link Modem - hopes weren't high but it appears pretty reasonable 802.11bgn + 8 LAN ports switch + WAN router. I noticed that it contained a "D-LINK GPL Code Statement" with link http://tsd.dlink.com.tw/GPL.asp which turns out to be their GPL web interface which lists masses of products and a download links to source code which includes my DIR-632 (took a little time to find it amongst the massive number of items). I am downloading it now - 185Mb. See what you actually get in that. The modem itself is rather nice - it has most features you could think of (no CLI though, Web interface) and has a built in manual that explains each feature in detail! I suspect they are letting them go at that price because the new 802.11ac modems have arrived. See http://www.msy.com.au/images/ADbanner/eletter/04042013/online/html.html for the original promotion. Anyway thought others might be interested in this and perhaps an example of GPL compliance that seems pretty good... Andrew

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Getting started with ZFS
by Colin Fee 10 Aug '13

10 Aug '13

Last night after some updates on my media server, one of the disks in a mirror set failed a SMART check and was kicked out (fortunately I have good backups). It's failing on the bad sector count but I haven't done a deeper analysis yet. However it's time to bite the bullet and do some upgrade work. I'm intending to replace all of the disks with larger ones to increase the storage size and when I do, use ZFS. The box is based around a Gigabyte GA-880GM-USB3 mobo, with an AMD Phenom II X6 1055T cpu and buckets of RAM and the OS on a 240Gb SSD. So I'm looking for a strategy re the implementation of ZFS. I can install up to 4 SATA disks onto the mobo (5 in total with one slot used by the SSD) -- Colin Fee tfeccles(a)gmail.com

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Re: [MLUG] Ubuntu forums -- hacked....
by Andrew McGlashan 30 Jul '13

30 Jul '13

On 22/07/2013 6:27 AM, Andrew McGlashan wrote: > http://ubuntuforums.org/announce.html > > Part of the maintenance page below .... Just a quick update TL;DR -- still down for users, restored, being tested by admins. Progress report 2013-07-20 2011UTC: Reports of defacement 2013-07-20 2015UTC: Site taken down, this splash page put in place while investigation continues. 2013-07-21: we believe the root cause of the breach has been identified. We are currently reinstalling the forums software from scratch. No data (posts, private messages etc.) will be lost as part of this process. 2013-07-22 -> 2013-07-25: work on reinstalling the forums continues. 2013-07-26: the forums are up running again and being tested privately by Forum administrators. Cheers A.

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802.11n cards/adapters for use with Host AP mode in Linux
by Jason White 30 Jul '13

30 Jul '13

I'm thinking of purchasing either a PCI Express card or a wireless USB adapter that can be used to create an 802.11n access point under Linux using hostapd. Notoriously, products can change quickly and one has to be sure to buy a device with the right chip set. My research so far indicates that an Atheros chip would be best - they seem to be well supported and the manufacturer is (or was) helping with the Linux drivers. A USB device would be slower, of course, but more portable - just connect it to any desktop/laptop with Linux installed. Alternatively, I could install a card in my main desktop machine, which has PCI Express slots available (but no PCI slot due to another card). Can this be made to work reliably? Any product recommendations would be welcome. On the USB side, this Web page mentions some potential devices: http://forum.doozan.com/read.php?2,6300

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anyone running Jessie yet?
by James Harper 28 Jul '13

28 Jul '13

Is anyone running Debian Jessie yet? Previously I was running Wheezy with a few packages from Sid and experimental, but in the past it's taken a month or two for the new testing release to reach some form of stability. Thanks James

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external drive enclosure
by Russell Coker 27 Jul '13

27 Jul '13

I've got a Dell Poweredge tower server running RAID-Z1 on 4 internal disks. I'd like to extend it with another maybe 8 disks in a RAID-Z2 with the option of easily adding another 8 or 16 later. The system has an eSATA connector so an enclosure that provides 24*3.5" disks with a SATA interface (not SCSI because I need SMART to work) at 6Gb/s (600MB/s) will do. Does anyone know of such an enclosure that's cheap? Ideally it wouldn't be excessively noisy (although 24 disks isn't going to be that quiet) because it's not a rack-mount system. Before someone comments on the speed, this is mostly for archival and the data will be accessed over a single Gig-E connection. So I need 100MB/s data transfer out of the system (maybe 140MB/s if a USB device is being used at the same time) and the 600MB/s will only be for zpool scrub. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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zpool status
by Russell Coker 26 Jul '13

26 Jul '13

I'm getting some errors on a zpool scrub operation. It's obvious that sdd has the problem both from the below output of zpool status and from the fact that the kernel message log has read errors about sdd. But how can I get detail about what has gone wrong? Has sdd given corrupt data in addition to read failures? Presumably the "(repairing)" string will disappear as soon as the scrub finishes, when that happens how would I determine that sdd was to blame without the kernel error log? # zpool status pool: tank state: ONLINE scan: scrub in progress since Thu Jul 25 16:38:01 2013 1.01T scanned out of 10.3T at 164M/s, 16h26m to go 1.40M repaired, 9.80% done config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 sda ONLINE 0 0 0 sdb ONLINE 0 0 0 sdc ONLINE 0 0 0 sdd ONLINE 0 0 0 (repairing) -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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SysAdmin Day (remix)
by Tom Robinson 26 Jul '13

26 Jul '13

Happy SysAdmin Day http://sysadminday.com/

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Lightzone problem - dependency present, not detected
by Andrew Greig 26 Jul '13

26 Jul '13

Hi all, OpenSUZE 12.3 64 bit, tring to install Lightzone. what is going on here, please? linux-bczj:/home/andrew/Downloads # rpm -iv liblzma5-5.0.5-1.1.x86_64.rpmPreparing packages... package liblzma5-5.0.5-1.1.x86_64 is already installed linux-bczj:/home/andrew/Downloads # lightzone Starting LightZone version 4.0.0 ... with options : liblzma was not found on the system; exiting linux-bczj:/home/andrew/Downloads # Many thanks Andrew Greig

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