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Re: [ALUG] 2600 meeting at 18:00 on Friday the 1st November.
by Steve Engledow 29 Oct '13

29 Oct '13

On 29/10/13 02:00, Viperfang wrote: > Quick heads up about this months Norwich 2600 meeting, > more info at http://www.norwich2600.co.uk So the 2600 reminder is coming through alright then :)

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2600 meeting at 18:00 on Friday the 1st November.
by Viperfang 29 Oct '13

29 Oct '13

Quick heads up about this months Norwich 2600 meeting, more info at http://www.norwich2600.co.uk

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Re: [ALUG] Best distro for XP users
by Phil Wade 28 Oct '13

28 Oct '13

I've recently discovered LXLE (on a Linux Format DVD...) and found it's just the job for replacing XP, especially on older or more limited hardware. I replaced Widows 7 Starter with LXLE on my daughter's Netbook, and she was delighted with the speed and ease of use. I can't see any rough edges, although it's based on Lubuntu that some here say is rough, and it looks and performs really well. 15 minutes of showing her round the OS and she was sorted. The upstream base is Ubuntu LTS - currently 12.04, with 14.04 LTS rather well timed for XP EOL? It's a very young distro, but looks to be well worth trying for all those XP machines out there. The download ISO (which even comes in 64 bit if needed) is a Live DVD. Apparently LXLE stands for Lubuntu eXtra Life Extension - well named. Although I use Mint on my main machines, I'll definitely be leaning to LXLE for those customers who'll need help moving from XP before April 2014 and beyond. Anyone else tried it?

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Diagnosing disk issue
by Mark Rogers 21 Oct '13

21 Oct '13

I have 4x2TB disks configured for RAID5. Initially they were in a USB3 external caddy but this never worked correctly - the raid kept dropping offline before it completed building the array. I then switched to eSATA (same caddy) and that improved things but I still failed to build the array completely. So they're now in a new HP microserver. Until now I assumed the issues were connectivity but since I still have the same problem there must be a disk issue of some kind. However SMART is reporting healthy even after longer self tests. Do I just right this off as a duff disk or can I investigate this further? syslog reports thus: Oct 4 01:30:09 backup kernel: [49309.671201] sd 4:0:0:0: [sdd] Unhandled error code Oct 4 01:30:09 backup kernel: [49309.671217] sd 4:0:0:0: [sdd] Oct 4 01:30:09 backup kernel: [49309.671222] Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT Oct 4 01:30:09 backup kernel: [49309.671229] sd 4:0:0:0: [sdd] CDB: Oct 4 01:30:09 backup kernel: [49309.671233] Read(10): 28 00 d9 2e b1 f0 00 04 00 00 Oct 4 01:30:09 backup kernel: [49309.671253] end_request: I/O error, dev sdd, sector 3643716080 Oct 4 01:30:09 backup kernel: [49309.671264] md/raid:md0: read error not correctable (sector 3643714032 on sdd1). Oct 4 01:30:09 backup kernel: [49309.671274] md/raid:md0: Disk failure on sdd1, disabling device. Oct 4 01:30:09 backup kernel: [49309.671274] md/raid:md0: Operation continuing on 2 devices. Oct 4 01:30:09 backup kernel: [49309.671310] md/raid:md0: read error not correctable (sector 3643714040 on sdd1). Oct 4 01:30:09 backup kernel: [49309.671316] md/raid:md0: read error not correctable (sector 3643714048 on sdd1). Oct 4 01:30:09 backup kernel: [49309.671321] md/raid:md0: read error not correctable (sector 3643714056 on sdd1). Oct 4 01:30:09 backup kernel: [49309.671326] md/raid:md0: read error not correctable (sector 3643714064 on sdd1). Oct 4 01:30:09 backup kernel: [49309.671331] md/raid:md0: read error not correctable (sector 3643714072 on sdd1). Oct 4 01:30:09 backup kernel: [49309.671336] md/raid:md0: read error not correctable (sector 3643714080 on sdd1). Oct 4 01:30:09 backup kernel: [49309.671341] md/raid:md0: read error not correctable (sector 3643714088 on sdd1). Oct 4 01:30:09 backup kernel: [49309.671346] md/raid:md0: read error not correctable (sector 3643714096 on sdd1). Oct 4 01:30:09 backup kernel: [49309.671351] md/raid:md0: read error not correctable (sector 3643714104 on sdd1). Oct 4 01:30:09 backup kernel: [49310.107789] md: md0: recovery done. Oct 4 01:30:09 backup kernel: [49310.170142] RAID conf printout: Oct 4 01:30:09 backup kernel: [49310.170156] --- level:5 rd:4 wd:2 Oct 4 01:30:09 backup kernel: [49310.170163] disk 0, o:1, dev:sdb1 Oct 4 01:30:09 backup kernel: [49310.170167] disk 1, o:1, dev:sdc1 Oct 4 01:30:09 backup kernel: [49310.170171] disk 2, o:0, dev:sdd1 Oct 4 01:30:09 backup kernel: [49310.170175] disk 3, o:1, dev:sde1 Oct 4 01:30:09 backup kernel: [49310.170279] RAID conf printout: Oct 4 01:30:09 backup kernel: [49310.170292] --- level:5 rd:4 wd:2 Oct 4 01:30:09 backup kernel: [49310.170299] disk 0, o:1, dev:sdb1 Oct 4 01:30:09 backup kernel: [49310.170304] disk 1, o:1, dev:sdc1 Oct 4 01:30:09 backup kernel: [49310.170309] disk 2, o:0, dev:sdd1 Oct 4 01:30:09 backup kernel: [49310.170322] RAID conf printout: Oct 4 01:30:09 backup kernel: [49310.170325] --- level:5 rd:4 wd:2 Oct 4 01:30:09 backup kernel: [49310.170329] disk 0, o:1, dev:sdb1 Oct 4 01:30:09 backup kernel: [49310.170332] disk 1, o:1, dev:sdc1 Oct 4 01:30:09 backup kernel: [49310.170336] disk 2, o:0, dev:sdd1 Oct 4 01:30:09 backup sSMTP[10706]: Unable to locate mail Oct 4 01:30:09 backup sSMTP[10706]: Cannot open mail:25 Oct 4 01:30:09 backup mdadm[3415]: Fail event detected on md device /dev/md0, component device /dev/sdd1 Oct 4 01:30:09 backup kernel: [49310.172571] RAID conf printout: Oct 4 01:30:09 backup kernel: [49310.172578] --- level:5 rd:4 wd:2 Oct 4 01:30:09 backup kernel: [49310.172585] disk 0, o:1, dev:sdb1 Oct 4 01:30:09 backup kernel: [49310.172589] disk 1, o:1, dev:sdc1 Oct 4 01:30:09 backup mdadm[3415]: RebuildFinished event detected on md device /dev/md0 Mark -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) @ 13 Clarke Rd, Milton Keynes, MK1 1LG

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Getting started with Linux and electronics
by Mark Rogers 21 Oct '13

21 Oct '13

Although not strictly OT here, there's almost certainly better places, so can anyone recommend any friendly mailing lists for getting started with using Linux to talk to GPIO etc? The sort of thing you might use a Pi or BeagleBone for (but not specific to a single platform). I've got several Pi's, a BB Black (and an Arduino for good measure) sitting around not really being used for much, and I really should learn to do some interesting things with them. There are loads of forums and Google Groups but I just prefer mailing lists like this one. Specific examples of the sort of thing I want to do: For personal use I want to do something interesting with Christmas lights, probably running from a solar charged 12V battery - that feels like it should give me plenty of scope to "play". Also, a colleague has asked about a simple application to record encoder and analogue input values to CSV on a periodic basis. In each case I can't even decide whether I should be looking at Arduino or Pi/BBB hence looking for a more general mailing list than one targeted at a specific solution. -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) @ 13 Clarke Rd, Milton Keynes, MK1 1LG

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[ALUG Announce] 3rd Monday Monthly Ipswich Social Meeting : The Mulberry Tree
by samwise 21 Oct '13

21 Oct '13

ALUG Announce Please send announcements to Announce(a)lists.alug.org.uk Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce ----- The monthly "Third Monday" ALUG Ipswich Social Meeting is back today, 21st October, at 20:00: The Mulberry Tree 5 Woodbridge Road IPSWICH IP4 2EA Tel: 01473 225776 Map/Directions URI: http://maps.google.co.uk/?q=IP4+2EA WWW: https://www.facebook.com/MULBERRYHOSPITALITY The Mulberry Tree, previously known as The Milestone Beer House, is a grade 2 listed building in the centre of Ipswich. It is located at the intersection between Woodbridge Road and the A1156, across the road from the old Odeon cinema and not far from the Regent Theatre. It re-opened on Thursday March 29th 2012 after a major refurbishment, under its original name of The Mulberry House and has already begun to regain a good reputation for its selection of beers and ales. It has a sizeable car park to the rear of the building. All are welcome, novices and experienced users. Feel free to ask for further information on the Main ALUG mailing list. Cheers, Peter. ----- Send discussion replies to main(a)lists.alug.org.uk (Reply-To set) Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce

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Recording event data efficiently
by Mark Rogers 18 Oct '13

18 Oct '13

I need to record changes in values of several variables (in this case around 9000) so that I can display their changes against time on a graph. I'd like a resolution of around 1min, however, I don't need to sample these values every minute because any change in value is available to me so the values only change on event. Storing a sample every minute for 9000 variables is about 1.3MB/day (each sample is a single byte). But that should compress heavily because for most of the time any given value will be static. So, what would be the best way to store these values for graphing? Recording the events in a database would be efficient storage but is not great for generating graphs from. (Graphs would be along the lines of what MRTG generates, at a rough guess, although that's not a tool I've used in anger. I looked at the MRTG log file format but unless I'm reading the spec wrong I don't think it's quite what I want.) If it matters, I plan on doing this on an ARM-based SBC such as a Pi or Beaglebone. Mark -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) @ 13 Clarke Rd, Milton Keynes, MK1 1LG

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SQL injection
by Mark Rogers 17 Oct '13

17 Oct '13

A payment gateway that a client is using is reporting that data we're submitting to it is triggering an SQL injection warning, and as a result the connections are being rejected (the end user is in the payment stage on a shopping cart and it being told that their IP is being blocked, which isn't very nice). The string they're apparently picking up on is: (Size:Medium (Size 12) )|27.4917 and specifically the ') )|27' part of it. The error being generated is: Possible SQL injection attack (detectSQLi)"] [data "s))o1,ARGS:xxxx" Other strings have triggered this where the number is different, it seems to be ))|<number> that causes a problem. (xxxx is the field we're submitting the value in, edited so as not to identify the payment gateway in use) Any suggestions as to what SQL attack this is trying to catch? I can't think of anything where ))|27 would represent an SQL injection attack. At the moment the payment gateway is just telling us to remove that string (they haven't given us an option to escape/encode it) which makes no sense. I'd like to know if this is part of a set of standard rules they're using that makes sense to someone or a homegrown set that might not. Mark -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) @ 13 Clarke Rd, Milton Keynes, MK1 1LG

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Resizing a mdadm RAID5 array
by Mark Rogers 15 Oct '13

15 Oct '13

OK, so as per other thread I have a RAID5 array comprising 4x2TB disks in which I want to replace the disks. Makes sense that I replace with 3TB disks, so that will mean resizing the array. My options (as I see them) are: 1. Backup all the data on the disks. Replace them all and create a new array. Restore all the data. 2. Replace disks one at a time and let the array recover, leaving blank space at the end of each partition for now. Then resize the array to take advantage of the remaining space. 3. Remove the disks and image them onto the new disks, leaving blank space. Bring the array up on the new disks then resize. Option 1 is by far the simplest, does anyone see any reason why I should try to be cleverer than this? (Actually, option 1a comes to mind which is better still: buy the new disks and get them set up in another box, build the empty array, then copy the data across and transfer the disks; much reduced downtime. If the array is ready before the weekend, and I leave the data copying across over the weekend, I should be good to go on Monday..) I think I've answered my own question but would still appreciate comments. -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) @ 13 Clarke Rd, Milton Keynes, MK1 1LG

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Can't uninstall Linux Spotify Client - help please
by steve-ALUG＠hst.me.uk 14 Oct '13

14 Oct '13

Hi Folks, Ages ago, I installed Spotify Linux client. I was tidying up today when I spotted that the Medibuntu project had closed so I removed that repository. I then spotted that I had the spotify client installed but I don't use it, so I tried to unistall it. It didn't work: sudo apt-get remove spotify-client [] The following packages will be REMOVED spotify-client [] Do you want to continue [Y/n]? y dpkg: error processing spotify-client (--remove): Package is in a very bad inconsistent state - you should reinstall it before attempting a removal. Errors were encountered while processing: spotify-client E: Sub-process /usr/bin/dpkg returned an error code (1) So I then tried to install it, various ways, for example https://www.spotify.com/uk/download/previews/ sudo apt-get install spotify-client Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: gir1.2-unique-3.0 libunique-3.0-0 Use 'apt-get autoremove' to remove them. The following packages will be upgraded: spotify-client 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. Need to get 41.7 MB of archives. After this operation, 17.7 MB of additional disk space will be used. Get:1 http://repository.spotify.com/ stable/non-free spotify-client i386 1:0.9.4.183.g644e24e.428-1 [41.7 MB] Fetched 41.7 MB in 1min 5s (634 kB/s) Selecting previously unselected package spotify-client. (Reading database ... 274060 files and directories currently installed.) Preparing to replace spotify-client 1:0.9.1.55.gbdd3b79.203-1 (using .../spotify-client_1%3a0.9.4.183.g644e24e.428-1_i386.deb) ... /var/lib/dpkg/info/spotify-client.prerm: 9: /var/lib/dpkg/info/spotify-client.prerm: ./unregister.sh: not found dpkg: warning: subprocess old pre-removal script returned error exit status 127 dpkg: trying script from the new package instead ... /var/lib/dpkg/tmp.ci/prerm: 9: /var/lib/dpkg/tmp.ci/prerm: ./unregister.sh: not found dpkg: error processing /var/cache/apt/archives/spotify-client_1%3a0.9.4.183.g644e24e.428-1_i386.deb (--unpack): subprocess new pre-removal script returned error exit status 127 No apport report written because MaxReports has already been reached /var/lib/dpkg/info/spotify-client.postinst: 5: /var/lib/dpkg/info/spotify-client.postinst: ./register.sh: not found dpkg: error while cleaning up: subprocess installed post-installation script returned error exit status 127 Errors were encountered while processing: /var/cache/apt/archives/spotify-client_1%3a0.9.4.183.g644e24e.428-1_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1) So now I'm stuck. I can't install it. I can't uninstall it. How can I get rid of this error and remove spotify? Cheers Steve

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