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Re: [ALUG] lappy aboard
by Noel Galer 08 May '17

08 May '17

>-----Original Message----- >From: main [mailto:main-bounces@lists.alug.org.uk] On Behalf Of Phil Thane >Sent: Monday, May 08, 2017 7:41 PM >To: main(a)lists.alug.org.uk >Cc: relay(a)wrexham-lug.org >Subject: [ALUG] lappy aboard > >This is Linux related, sort of, so I hope ALUG don't mind the apparently >random question. (cc'd to my old LUG in Wrexham, they're used to mad >questions >from me). > >I have just bought a canal/river boat and want to use my Linux laptop on >it. >The PSU for it is labelled 19v, 4.7 amps. The boat runs on 12v. The >simplest >but quite pricy option is to get an inverter to create 220v AC then use the >standard PSU but apart from cost it lacks elegance. > >The boat has 2 completely separate circuits (at present, I'll probably re->wire >it next winter). There is a 12v battery charged by the engine that is used >for >the engine starter and a few ancillaries such as the horn and nav lights. >The >there is another 12v battery charged by a solar panel on the roof used for >cabin lights. > >If I connect the two in series I should get 24v then I should be able to >acquire (or even assemble) a DC-DC voltage regulator to bring it down to >19v. > >Anyone see any problems with that? > >-- >Phil Thane > >www.pthane.co.uk >phil(a)pthane.co.uk >01767 449759 >07582 750607 >Twitter @pthane May I make an alternative suggestion ? There are lots of really inexpensive 'Boost' or 'Step-Up' regulators now available on eBay. These are switch mode and therefore very efficient too. It is a common application to use one of these to provide 24V from a 12V system and 19V would not be a problem as they are mostly adjustable. Here is a link to such an item that might be suitable ( I have no financial or other interest in this item or supplier, it was picked at random ):- http://www.ebay.co.uk/itm/New-DC-Converter-150W-10-32V-to-12-35V-Boost-S tep-up-Power-Supply-Module-/252691490519?hash=item3ad59626d7:g:LxQAAOSw2 41YWsVX This is just an example, there are plenty more, larger and smaller, but this might do the job with a bit more heat sinking as is recommended. There are a few caveats too. Some laptop power supplies, Dell being an example, use an extra wire ( with Dell it's a small signal only pin in the centre ) to provide a power pack identification. If not present, things don't work too well despite supplying the correct voltage and sufficient current. This is supposedly to ensure the correct power rated pack is used, but you and I might just think it is to prevent after market PSUs from being used. If your source battery goes flat ( under 10.5V = zero charge ) a boost regulator will just keep sucking charge out of a lead acid battery and damage it, but then so might any other drain on that battery, e.g. lights. If you connect the two 12V systems in series as you suggest, you will be ok as long as both do not share a common ground line. I have no idea if this might be the case. Also, when one system is depleted, lets face it they are unlikely to have the same capacity, i.e. one goes flat as above ( < 10.5V ) damage could still occur to one system. But if you do, a quick look on eBay for a 'Buck' regulator similar to the link I gave, would do that job. If you decide to use a boost regulator and end up with one that has a Constant Current control, don't be tempted to set this to the current on the laptop power supply. I would set it somewhat higher, in your case 6A or more, or to maximum to handle transients when switching on etc. The laptop will only pull the current it needs. I use these things all over the place including my 'Demonic' WolfLite handlamp that instead of a 3W bulb, now has a 40V 1A LED unit running from 18V of LiPo batteries. Best regards, Noel ( Xorsyst ) _______________________________________________ main(a)lists.alug.org.uk http://www.alug.org.uk/ https://lists.alug.org.uk/mailman/listinfo/main Unsubscribe? See message headers or the web site above!

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USB Backup Disk problems
by steve-ALUG＠hst.me.uk 08 May '17

08 May '17

Hi Geniuses! I have a 2TB Seagate USB disk that is being used with backuppc to store daily backups. However, almost every day the backup is failing, and attempting to ls the drive gives "input/output error". Looking through DMESG shows multiple problems reading sectors on the disk, but I've yet to find a particular cause. If I reboot the machine, the drive immediately starts working again. If I fsck it, it reports no errors. The disk has two partitions on it, and the 2nd partition is used by SimpleBackup, and this seems to work fine. I'm currently backing up the backup before I do some more in-depth testing on it, and possibly reformat it. I forgot to mention that both partitions are encrypted. Do people think the disk is broken (bad sectors or hardware problems), or if not, any idea what's going on? On to the next problem. I bought a different 2TB Seagate USB 3 disk which I was intending to use to replace the problematic disk. I managed to set up encrypted partitions on the new disk, and configure the computer so that they would automatically mount on boot.... so I tried to boot the machine and.... the BIOS screen appeared, then it said detecting devices... The old faulty drive is detected, but then the USB 3 Driver is not detected and the machine hangs. It's simple, with the drive connected at boot, the machine won't boot or detect the drive. Without the USB3 drive connected, the machine boots fine. I'm guessing that the machine, which is quite old, can't cope with something about the new drive, perhaps it's slightly too big (although they're both ~2TB), or because it's USB3, and I think the old one is USB2. The old one has a power supply, but the new one doesn't, but I tried connecting it via a powered hub, and no difference. Is there any way round the machine not booting? I don't think there's a updated bios for this old machine. Any ideas, straws to clutch at? Steve

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[ALUG Announce] ALUG Norwich Pub Meet Thursday 11th May
by Viperfang 08 May '17

08 May '17

ALUG Announce Please send announcements to Announce(a)lists.alug.org.uk Unsub, change settings via https://lists.alug.org.uk/mailman/listinfo/announce ----- Hello Norwich Aluggers, Our monthly ALUG Norwich social meeting will be held this Thursday, 11th May 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 https://lists.alug.org.uk/mailman/listinfo/announce

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HMRC payroll software and zlib
by Jenny Hopkins 02 May '17

02 May '17

Hi all, I'm attempting to set up payroll on debian jessie using the HMRC's payroll software for linux. When I try and run it, however, I get the following error: zipimport.ZipImportError: can't decompress data; zlib not available Fatal Python error: unable to locate initialization module I've installed these packages, but no change. libjzlib-java zlib1g:amd64 zlib1g-dev:amd64 zlibc Following a similar thread for this error, I ran python and got the following info: >>> zlib.__version__ '1.0' Any ideas on what else I need to install, or what the problem could be? Thanks, Jenny

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2600 meeting at 18:00 on Friday the 5th May.
by Viperfang 02 May '17

02 May '17

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

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DNS lookups with systemd-resolve (Ubuntu 17.04)
by Mark Rogers 24 Apr '17

24 Apr '17

I have a local DNS server, and in it are several hosts, specified both with and without a domain name. Eg: $ dig @192.168.1.5 myhost ... ;; ANSWER SECTION myhost. 0 IN A 192.168.1.123 ... $ dig @192.168.1.5 myhost.mydomain ... ;; ANSWER SECTION myhost.mydomain 0 IN A 192.168.1.123 However, if I don't specify the DNS, the first query (myhost) times out, where the second (myhost.mydomain) still works fine. My PC gets its DNS settings via DHCP. /etc/resolv.conf contains only 127.0.0.53 which as I understand it is systemd-resolve. /run/systemd/resolve/resolv.conf contains only 192.168.1.5 (my DNS). So, in the case of a query for "myhost.mydomain", systemd-resolve is correctly passing the query on to my DNS. But in the case of "myhost" it is not (I don't know what it is doing instead). If I try "ping myhost" I get "Name or service not known". Similarly, if I try ssh mark@myhost. Suggestions? -- 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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Mesh wireless
by Mark Rogers 24 Apr '17

24 Apr '17

I started looking at a few commercial mesh wireless products, which typically retail at around £300-400 for a typical house. I then Googled and discovered a few Linux mesh wireless projects, such as might suit running on a Pi. Anyone here have any experience of such things? (The biggest obstacle with the Pi is likely to be the slow Ethernet port but there are faster single board computers around that might work better. Regardless, the Pi might be a good place to start playing.) -- 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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Pub meet + GPG
by Bill Hill 13 Apr '17

13 Apr '17

It has been a while - GPG key signing? -- Red to red, black to black, switch it on, but stand well back.

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Shutdown!
by Michael Goddard 12 Apr '17

12 Apr '17

Using Mint 18.1 on my laptop, when using 'shutdown' it does just that, but then reboots a few seconds afterwards, every time recently! Tia, Michael -- Michael Goddard <emmjee(a)mypostoffice.co.uk>

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[ALUG Announce] ALUG Norwich Pub Meet Thursday 13th April
by Viperfang 10 Apr '17

10 Apr '17

ALUG Announce Please send announcements to Announce(a)lists.alug.org.uk Unsub, change settings via https://lists.alug.org.uk/mailman/listinfo/announce ----- Hello Norwich Aluggers, Our monthly ALUG Norwich social meeting will be held this Thursday, 13th April 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 https://lists.alug.org.uk/mailman/listinfo/announce

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Writing to Google Sheets from bash
by Mark Rogers 07 Apr '17

07 Apr '17

I don't suppose anyone here has any experience of writing to Google Sheets from bash? (Specifically, I'm trying to use curl to write values into a pre-existing spreadsheet.) I started with a fairly simple aim: To have a few Linux boxes (servers, Pi's, etc) periodically update a central spreadsheet with stuff like disk utilisation, updates pending, O/S version, etc. However I haven't had to deal with OAuth2 before and I'm going round in circles trying to find out exactly what authentication I need to configure. My attempts at Googling have lead me into most of those circles without getting me out again! It seems like a useful concept to pursue but I have to admit I'm just way out of my depth! -- 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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Strange PC lock-up
by Mark Rogers 05 Apr '17

05 Apr '17

Several times over the past few weeks I've had my PC (Ubuntu 16.10*) apparently lock up: desktop stops changing (clock stops updating) but the mouse (usually) continues to move. Sometimes I can SSH in, although more often I can get as far as entering username/password but never reach a terminal prompt. It can happen while I'm actively using it (mid-sentence), or if I go away and come back it could have locked in my absence, often relatively shortly after it was left (the stopped clock is quite handy...) I found messages in syslog relating to nouveau so I replaced the graphics card (as a fairly cheap swap out). That made no difference (actually if anything it got worse, although I'd hesitate to say so for sure). Rather than mess around I bought a new PC and transferred my system disk to it, still figuring it felt like a hardware issue. Except that the problem has followed across onto the new PC. The only things moved across are the new graphics card and three hard disks. It no longer feels like a hardware issue.... How do I diagnose? Or am I just looking at a re-install? * Note that this PC has been upgraded through several versions, it wasn't a clear 16.10 install. The only "major" change recently has been a shift from Chrome to Opera as the primary browser (and since I tend to have dozens of tabs open and most of my work involves a browser in some way that does count as a major change). Mark -- 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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2600 meeting at 18:00 on Friday the 7th April.
by Viperfang 04 Apr '17

04 Apr '17

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

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SSH tunnelling
by Mark Rogers 28 Mar '17

28 Mar '17

I need to access the web server on a VM in my office, from my laptop. I have SSH access to an intermediate PC and from there to the VM. Ie: Laptop -> PC -> VM How do I set up a tunnel from laptop through PC to VM to give me access to port 80 on the VM? If relevant: Each of the two SSh connections will require (different) user/password. Mark -- 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] Machine slows down
by Christopher Dawkins 23 Mar '17

23 Mar '17

> Several times over the past few weeks I've had my PC (Ubuntu 16.10*) > apparently lock up: desktop stops changing (clock stops updating) but > the mouse (usually) continues to move. Sometimes I can SSH in, > although more often I can get as far as entering username/password but > never reach a terminal prompt. Run 'top' in a console window on the screen beforehand. I find Firefox can do this with some web sites that are too javascript-heavy, load averages up to 50 or more. -- Christopher Dawkins Archivist, Felsted School http://archives.felsted.org Garnetts Corner, Jollyboys Lane North, Felsted, Dunmow, Essex CM6 3DU cchd(a)pjcd.org 07816 821659 01371 821076

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Digital East Anglia meetup
by Ewan Slater 23 Mar '17

23 Mar '17

If anyone's interested: https://www.meetup.com/digital-east/events/238348094/?a=socialmedia

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Delay in sending mail
by Jenny Hopkins 22 Mar '17

22 Mar '17

Hello, Can anyone suggest why sending IMAP mail from either icedove, thunderbird, claws on a client is taking about a minute (about ten seconds "connecting to server" then over 30 seconds with "delivering mail"), whereas using mutt it goes in an instant? I must have something misconfigured somewhere, but don't know where to start looking - exim4 and dovecot logs on the server aren't showing anything up of interest. Thanks for any suggestions, Jenny

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[ALUG Announce] ALUG Norwich Pub Meet Thursday 9th March
by Viperfang 06 Mar '17

06 Mar '17

ALUG Announce Please send announcements to Announce(a)lists.alug.org.uk Unsub, change settings via https://lists.alug.org.uk/mailman/listinfo/announce ----- Hello Norwich Aluggers, Our monthly ALUG Norwich social meeting will be held this Thursday, 9th March 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 https://lists.alug.org.uk/mailman/listinfo/announce

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2600 meeting at 18:00 on Friday the 3rd March.
by Viperfang 28 Feb '17

28 Feb '17

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

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Re: [ALUG] Automated IMAP client
by Christopher Dawkins 27 Feb '17

27 Feb '17

> I'm thinking a simple ticketing system would be good, although I've > not yet found a "simple" ticketing system that doesn't try to do so > much as to be too big a job to implement it in the first place. Nothing is simple, except for gurus, but try (Request Tracker). -- Christopher Dawkins Archivist, Felsted School http://archives.felsted.org Garnetts Corner, Jollyboys Lane North, Felsted, Dunmow, Essex CM6 3DU cchd(a)pjcd.org 07816 821659 01371 821076

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Automated IMAP client
by Mark Rogers 27 Feb '17

27 Feb '17

Are there any tools to set up an automated IMAP client? By which I mean I want to set up some software on a headless Linux box which connects to an account on an IMAP server elsewhere. It could then be configured to perform actions on received email, such as filter it, move it to folders, forward it to people based on various criteria, etc. It seems like the sort of thing that must exist but I'm clearly picking the wrong things to Google for... Mark -- 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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What's a fast way to check for something on LAN?
by Chris Green 22 Feb '17

22 Feb '17

I want a fast (as in less than a second, not 'computer fast') way of checking if a particular private IP is present on the LAN. I need this for use in a match construct in an SSH config file, e.g.:- # # # odin may be remote or local from t430 # Match host odin exec "sh -c 'hostNotLocal 192.168.0.104'" ProxyCommand ssh cheddar nc -q0 localhost 51234 Currently 'hostNotLocal' is:- #!/bin/bash # # # Test if specified host is ping'able # ! ping -c 1 $1 >>/dev/null 2>&1 The problem with this is that on any LAN except one using 192.168.0.xxx it takes several seconds to decide that 192.168.0.104 isn't there. For any nit-pickers, yes I know if I just happen to be connected to a LAN which isn't where 'my' 192.168.0.104 is I'll get a false positive but I can live with that. I just want a fast way of knowing that 192.168.0.104 *isn't* there. -- Chris Green

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Correct MX record configuration
by Chris Green 20 Feb '17

20 Feb '17

This may relate to my recent long question about loss of E-Mail. Can anyone tell me *exactly* how an MX record for my home server zbmc.eu should be confiugured? Currently it's configured to point to the 'root' A record for zbmc.eu, so the MX record is for zbmc.eu also:- chris@cheddar$ host zbmc.eu zbmc.eu has address 84.92.49.234 zbmc.eu mail is handled by 10 zbmc.eu. chris@cheddar$ However I *think* this may be wrong and I should create a second A record for the same IP address and point the MX record to that instead. I don't really understand why this should make any diffrerence though. Any experts (or at least people who know more than me) here? -- Chris Green

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Re: [ALUG] I need an E-Mail expert to help me solve this
by Phil Ashby 19 Feb '17

19 Feb '17

On 19/02/17 12:00, Chris Green <cl(a)isbd.net> wrote: > > I have an E-Mail requirement/problem that I've wasted several hours on over the past few days to > little effect. Maybe someone here can help. > > My home (linux) machine runs all the time and hosts the domain zbmc.eu which is registered at > gandi.net. The zone file there is configured to point at my home machine and the MX record is > set up too:- > chris@cheddar$ host zbmc.eu > zbmc.eu has address 84.92.49.234 > zbmc.eu mail is handled by 10 zbmc.eu. > chris@cheddar$ 84.92.49.234 is my PlusNet ADSL connection. > > ..[lots of testing that indicates 'something' is blocking SMTP on some routes, but not all...] Hi Chris, I have almost the same setup as you, an external/public server (mail.ashbysoft.com) that forwards mail to an internal/private server at home (phil.ashbysoft.com, on PlusNet), my external server is in a co-lo facility and managed by me, rather than a 3rd part but hey, it's still working so it doesn't look like PlusNet per se.. I tried a few tests for your host: - from my home network (via NAT, PlusNet): phlash@zaphod:~$ host zbmc.eu zbmc.eu has address 84.92.49.234 zbmc.eu mail is handled by 10 zbmc.eu. phlash@zaphod:~$ telnet zbmc.eu 25 # not looking good for inbound connectivity on 25 Trying 84.92.49.234... ^C phlash@zaphod:~$ telnet zbmc.eu 587 # nor the alternative SMTP submission port 587 Trying 84.92.49.234... ^C - from my external server (via NAT, Virgin Media): phil:~$ telnet zbmc.eu 25 # still no joy Trying 84.92.49.234... ^C phil:~$ telnet zbmc.eu 587 # kind of expected by now :/ Trying 84.92.49.234... ^C phil:~$ ping zbmc.eu # just checking the endpoint is up :) PING zbmc.eu (84.92.49.234) 56(84) bytes of data. 64 bytes from chrisisbd01.plus.com (84.92.49.234): icmp_seq=1 ttl=243 time=25.2 ms 64 bytes from chrisisbd01.plus.com (84.92.49.234): icmp_seq=2 ttl=243 time=25.5 ms 64 bytes from chrisisbd01.plus.com (84.92.49.234): icmp_seq=3 ttl=243 time=21.6 ms ^C - last check for my own connectivity, to prove it's not local to me: phil:~$ telnet phil.ashbysoft.com 25 # looks OK Trying 84.92.108.193... Connected to phil.ashbysoft.com. Escape character is '^]'. 220 phil.ashbysoft.com ESMTP Exim 4.88 Sun, 19 Feb 2017 15:05:43 +0000 quit My conclusion so far would be that you have local firewalling / filtering issues that are permitting traffic from the TsoHost servers but nowhere else? Are you running fail2ban and it has been a bit enthusiastic (this has got me in the past, blocking the kids mobiles when they bork their password a couple of times)? What about port forwarding arrangements, just for specified external IPs? NB: I have switched to port 587 for all my immediate users (family & friends, you know the score!) to submit mail from their clients through my relay service, as they were finding that port 25 was blocked outbound by whatever ISP they were using at the time (typically mobile / public services like The Cloud). Hope this helps, Phil.

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Managing cron and similar E-Mails from headless systems
by Chris Green 19 Feb '17

19 Feb '17

I have several headless systems doing useful work around the place:- A Raspberry Pi providing local DNS and DHCP A Beaglebone Black on our boat monitoring temperatures and batteries An old desktop doing backups in the garage etc. Most of these have one or more cron jobs running periodic rsync backups, copying data, etc. If the cron job has an error then it sends E-Mail to the owner of the job ('chris' in most cases, might be root in a couple). It's (moderately) easy to set up an MTA and /etc/aliases so that the messages are sent to my normal E-Mail. However I can't come up with a straightforward way of indicating where the messsage is *from*. You can't just invent a domain name for the headless system because that gets the E-Mail rejected by intermediate systems that try and look up the sender host name. Cron doesn't seem to have any mechanism for setting the sender's name, cron errors just come from 'root@'. Can anyone suggest a neat way of handling this so that I know where the errors are coming from? -- Chris Green

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