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10372 discussions

Anyone use x2go or similar software?
by Chris Green 11 Jan '13

11 Jan '13

I was considering using VNC to access another box on my LAN but as the remote system (which would run a VNC server) doesn't currently have X running on it (though there's a Lubuntu desktop available) it makes VNC rather awkward. I've seen x2go recommended for this sort of situation as it seems as if it's more oriented towards the sort of thing I want to do - fire up an X session and use it remotely. While it would be nice if one could use 'old fashioned' X as it was originally designed it tends not to work so well with very many programs now using dBus to communicate. E.g. if I try and run nm-connection-editor on the remote system via an "ssh -x remote-system" connection it pops up a window on my system but there's an error:- ** (nm-connection-editor:3088): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-9FFbE3UfRz: Connection refused ... and it doesn't actually work. Or can anyone suggest how to get around the dBus communication issue? -- Chris Green

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Full size but low power PCs - does nobody sell them? (maybe related to Laurie's recent question)
by Chris Green 10 Jan '13

10 Jan '13

Why is it that no one seems to sell 'ordinary' PCs, in ordinary sized boxes, but with reasonably power efficient components. It's next to impossible to even find out what the power consumption is of most desktop PCs and very few of them have efficient power supplies (often the worst offender). It's all very well advocating little Intel Atom based boxes but they almost never have any space for extra disk drives. The same applies to Raspberry Pi etc., very low power but no easy way to assemble in a box with a couple of disk drives. I guess I'm after much the same as Laurie but with maybe more emphasis on power consumption. A basic case with low power mother board, low end processor, etc. and space for several disks. -- Chris Green

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Are there any linux based NAS systems out there with reasonable audio output?
by Chris Green 10 Jan '13

10 Jan '13

I want a compact, low power Linux box to use as a NAS and audio streamer (probably running mpd). This is a slightly odd mix of requirements, does anyone have any suggestions of what to look at? Alternatively maybe a 'media streamer' would provide what I want, but I need it to have audio outputs and be able to run something like mpd so that it can run headless and be driven remotely. A custom built Linux box is a valid possibility too but getting a small, low-power one isn't trivial. (Raspberry Pi is out because its audio is notoriously bad and there seem to be few workarounds to avoid its sound problems) -- Chris Green

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Re: [ALUG] Full size but low power PCs - does nobody sell them? (maybe related to Laurie's recent question)
by Chris Green 10 Jan '13

10 Jan '13

On Thu, Jan 10, 2013 at 04:47:47PM +0000, Anthony Anson wrote: > On 10/01/13 16:19, Chris Green wrote: > >Why is it that no one seems to sell 'ordinary' PCs, in ordinary sized > >boxes, but with reasonably power efficient components. > > If you don't feel competent to build one from scratch, go to a > proper computer shop (where are you? I can recommend some in the > Norwich area.) and they will put one together for you - probably > cheaper than you could. > I've been building my PCs since quite a long time ago (like since they were 386 processors, and NextGen processors - remember them?). However nowadays it doesn't really make economic sense. > >It's next to impossible to even find out what the power consumption is > >of most desktop PCs and very few of them have efficient power supplies > >(often the worst offender). > > > >It's all very well advocating little Intel Atom based boxes but they > >almost never have any space for extra disk drives. The same applies to > >Raspberry Pi etc., very low power but no easy way to assemble in a box > >with a couple of disk drives. > > Not a tremendous challenge though. > It's not a challenge putting a Raspberry Pi in a box and adding some USB disks, no. However it won't be a particularly good server. The difficulty is finding out which motherboards are low power and then finding a suitably efficient power supply. My desktop machine (Intel I3, 8Gb memory, two 1Tb disks) consumes only about 40 watts because I chose a reasonably low power board (after much searching to find information) and an efficient power supply. It's still a *bit* of a bodge though because the power supply isn't designed to fit in a standard box. Since my system only uses 40 watts it needs a much smaller power supply than most full-sized PC ones. Even a very efficient 300 watt power supply isn't going to be particularly good at 40 watts. I'm using an 80 watt supply. > >I guess I'm after much the same as Laurie but with maybe more emphasis > >on power consumption. A basic case with low power mother board, low end > >processor, etc. and space for several disks. > > Then you can run Tom's RTBT and have a low-end OS too? > > This is where your competent small trader scores. Try Anglian Internet. > I'd be *really* surprised if they know power consumption figures for assembled PCs (before they assemble them that is, I can measure the consumption of something I've built). I will send them an enquiry though. -- Chris Green

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Reassembling RAID array
by Mark Rogers 10 Jan '13

10 Jan '13

I had a RAID5 array set up as /dev/md1 using 4 external USB3 drives. Following a reboot (I assume, although to be honest I'm not sure what caused it) the array hasn't come back up correctly: $ cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md1 : active raid5 super 1.2 level 5, 512k chunk, algorithm 2 [4/0] [____] md0 : active raid5 sda1[0] sdb1[1] sdd1[3] sdc1[2] 5860535808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU] unused devices: <none> Note: /dev/md0 is a separate array and is working fine; md1 should comprise sd[fghi]1 All the "missing" partitions are present, eg: $sudo fdisk -l /dev/sdf Disk /dev/sdf: 2000.4 GB, 2000398934016 bytes 81 heads, 63 sectors/track, 765633 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x2c2d5341 Device Boot Start End Blocks Id System /dev/sdf1 2048 3907029167 1953513560 fd Linux RAID autodetect (same applies for the other three disks). How do I get mdadm to add my disks into the array, both now and after a reboot? -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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Best way to code a linux comms daemon
by Mark Rogers 09 Jan '13

09 Jan '13

Occasionally I have the need to write some communications software, typically something that connects to a serial or TCP port, writes requests and reads responses, writing the results into a database. Usually the basics are simple enough to achieve, but the challenge is in making a robust solution that will cope with lost connections and any other variety of reasons why things might go wrong (including bugs in the script itself). What is the "best" way to approach something like this? Are some programming languages better than others for this? What's the best way to ensure a script restarts if it fails for some reason? I'm looking for something Debian/Ubuntu based if relevant. [Aside: One reason for asking is that I have been playing with an app I downloaded that talks to CurrentCost power meters, with a PHP-based web interface and a Python-based daemon, and I'm not sure why Python was chosen for it; also I note that the daemon regularly crashes on my system leaving me without any data.] -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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Re: [ALUG] Best way to code a linux comms daemon
by Barry Samuels 09 Jan '13

09 Jan '13

On 09/01/13 09:30:13, Mark Rogers wrote: > On 8 January 2013 09:43, Barry Samuels > <bjsamuels(a)beenthere-donethat.org.uk>wrote: > > > I also use the Python-based interface written by Dale Lane. I have > > to run that 3 times every 24 hours to store data for the bar graphs > > and don't understand Python enough to be able to modify it to run > > unattended. Yes I know that there is an option to 'stay connected' > > but I don't want it running all the time just long enough to > > collect 24 hours worth of data. > > > > Cheers, I'll take a look at Dale's code, I've been using "measureit": > http://code.google.com/p/measureit/ > > I thought that I would, at least, express an interest. > > > > Thanks, it was awful quiet out there! Measureit looks interesting but appears to be for the Envi and Envir models only and mine is older than that. Pity. Some of my posts haven't appeared on the list and I haven't had a copy back but I've just realised why. I think I've been clicking 'Reply' instead of 'Reply to group' so some posts went directly to the poster instead of to the group. Apologies to those affected and old age means it can only get worse. :(( -- Barry Samuels http://www.beenthere-donethat.org.uk The Unofficial Guide to Great Britain

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Debian CDs
by James Freer 08 Jan '13

08 Jan '13

Knowing some of you use debian i just wanted to check before i download the wrong thing. If one wants a bootable (but not live CD) one just downloads the first CD of the (gulp) 53 available. I want to install xfce... so is the first one still ok? Since the last time i tried debian they seem to have liveCD iso and stick isos. Further down the list there is debian-6.0.6-i386-xfce+lxde-CD-1.iso I assume this is xfce and lxde desktops on one iso - but i can't find any info referring to it on the website. Would this be the better choice? thanks james

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HDD error
by Richard Lewis 07 Jan '13

07 Jan '13

Hello ALUG, A few weeks ago I got this error when booting my Debian box: ata1.00: exception Emask 0x50 SAct 0x0 SErr 0x280900 action 0x6 ata1.00: BMDMA stat 0x66 ata1.00: SError: { UnrecovData HostInt 10B8B BadCRC } ata1.00: failed command: READ DMA EXT ata1.00: cmd 25/00:08:00:a8:d6/00:00:3d:00:00/e0 tag 0 dma 4096 in res 51/84:00:00:a8:d6/84:00:3d:00:00/e0 Emask 0x70 (host bus error) ata1.00: status: { DRDY ERR } ata1.00: error: { ICRC ABRT } ata1.00: hard resetting link ata1.01: hard resetting link ata1.00: SATA link up 1.5 Gbps (SStatus 113 SControl 310) ata1.01: SATA link up 1.5 Gbps (SStatus 113 SControl 300) ata1.00: configured for UDMA/33 ata1.01: configured for UDMA/133 ata1: EH complete It was repeating every second or so from very early on in the boot. It did eventually boot with the root filesystem mounted read-only and the partition on which I mount /home mounted normally. In a panic, I did a backup and bought a replacement disk. Shortly afterwards I did a full SMART test and it came up clean. Since then, I haven't encountered any problems and in fact never got round to replacing the disk. (The new one is still in the packaing on the shelf.) However, this evening the same thing has happened. I did a bit more research this time and it seems this could be a SATA cable issue. The box is a Shuttle XPC which I bought as a complete system (not self-build). Does this sound like it is a problem with the SATA cable? And if so, does anyone have any recommendations or advice regarding replacing it and helping to prevent this problem in future? Thanks and best, Richard -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Richard Lewis j: ironchicken(a)jabber.earth.li @: lewisrichard http://www.richardlewis.me.uk/ -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

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[ALUG Announce] ALUG Norwich Pub Meet Thursday 10th January
by Viperfang 07 Jan '13

07 Jan '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 ----- Hello Norwich Aluggers, Our monthly ALUG Norwich social meeting will be held this Thursday, 10th January at The Coach and Horses (82 Thorpe Road, Norwich, NR1 1BA). The meeting officially starts at 8pm, although some people may arrive earlier. More information on those people can be found on the list and the IRC channel. If you are unsure if you will recognise us then make yourself and your intent to attend known by either posting on list or visiting us on IRC so we can look out for you rather than hiding in the corner. Optionally you could ask at the bar if they know where the geeky computer weirdos are and they'll point you in the right direction (seriously!). Another possibility is look for heaps of electronics on a table that may possibly look like movie props that would used for detonating explosives. Feel free to bring electronics/laptops/gadgets to the meet, you will by no means be alone. Ben Bewick aka Viperfang NB: This mail is automated, please refer to the usual sources for more information. ALUG Contact Details: Website : http://www.alug.org.uk/ IRC : #alug on irc.alug.org.uk List : http://lists.alug.org.uk/mailman/listinfo Twitter : http://twitter.com/anglianlug Identica: TBA Facebook: http://www.facebook.com/group.php?gid=2381613902 ----- 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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