IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 7 September 2015   (all times are UTC)

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02:42
<fnurl>
so hey I don't wanna spam a quiet channel
02:42
I asked last friday - but no one was able to help
02:42
my issue is thin client printing on Pinet/LTSP/Chroot/CUPS
02:42
at the moment, the ubuntu host can see the network printer and print
02:42
the thin clients can't see the printer, and I can't log into the chroot install of CUPS
02:42
I added root to lpadmin, but I still can't log in at the moment, the ubuntu host can see the network printer and print
02:42
I added root to lpadmin, but I still can't log in
02:43
oops sent twice :/
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03:30
<fnurl>
so hey I don't wanna spam a quiet channel
03:30
I asked last friday - but no one was able to help
03:30
my issue is thin client printing on Pinet/LTSP/Chroot/CUPS
03:31
at the moment, the ubuntu host can see the network printer and print
03:31
the thin clients can't see the printer, and I can't log into the chroot install of CUPS
03:31
I added root to lpadmin, but I still can't log in at the moment, the ubuntu host can see the network printer and print
03:36
<work_alkisg>
fnurl: thin client printing is not done with CUPS but with jetpipe, PRINTER_x= in lts.conf
03:36work_alkisg is now known as alkisg
03:47
<fnurl>
thanks alkisg
03:47
i saw a mention of jetpipe elsewhere
03:48
<alkisg>
!lts.conf
03:48
<ltsp>
lts.conf: (#1) http://manpages.ubuntu.com/lts.conf, or (#2) lts.conf manpage is available in the ltsp-docs package
03:48
<fnurl>
is that for local or network printers, or is that not an issue
03:48
<alkisg>
Not an issue. Only ltsp fat clients and the ltsp server use cups
03:48
<fnurl>
excellent!
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03:48
<fnurl>
much appreciated bud, I'll report back with a result
04:01
<alkisg>
fnurl: note that when you log in to a thin client, you're working on the server, so it's the server that's supposed to use CUPS and see the network printer
04:01
PRINTER_x in lts.conf is for local printers connected to the thin clients themselves
04:02
<fnurl>
yeah - i was confused about why I would need a second install of CUPS, I assumed the cups in the jail was needed to relay to the CUPS on the server
04:02
i just uninstalled CUPS and rebuilt image, about to look up the process to install/config jetpipe
04:09
<alkisg>
fnurl: you don't need jetpipe to access a network printer from a thin client session
04:09
You only need it if the printer is not a network one, but e.g. a usb one connected to the thin client
04:23
<fnurl>
oh
04:23
sorry - was afk (lunch time here)
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07:01
<muppis>
Morning.
07:01
!dvd
07:01
<ltsp>
I do not know about 'dvd', but I do know about these similar topics: 'docs', 'dhcpd', 'dhcp'
07:02
<muppis>
Any suggested approach to dvd replay on thin client?
07:03
<shogunx_>
i would not approach the user trying that. i would run away as fast as possible.
07:03
<vmlintu>
Years ago I did it by mounting the dvd as a data disk and then opening the files with vlc
07:05
<muppis>
It mounts as data disk (as already being one), but mountpoint at server is not available on client.
07:07
So how I make same mountpoint visible to client or do I write a script make it point directly to /dev/sr0 ?
07:09
I think I write a script.
07:13
<vmlintu>
Is the dvd drive on the client or on the server?
07:13
<muppis>
On the client.
07:28
<vmlintu>
It was ages ago, but I remember that working without any hacks..
07:28
<muppis>
That would be nice.
07:43
ltsp-localapps vlc /dev/sr0 starts the video. Now only thing is how make it user friendly.
07:43
<fnurl>
so hey, I was asking earlier about thin client printing, and i still haven't nailed it
07:44
i'm starting to think we should deploy an edubuntu instead
07:44
<muppis>
Printing from client or to client?
07:44
<fnurl>
where we have a (newly purchased) router, and it hands out 10/20 fixed IP addresses, will that be a problem if the edubuntu is in DHCP role
07:45
muppis: printing from the thin clients
07:45
<alkisg>
fnurl: can you print to your network printer from the ltsp server?
07:45
I.e. if you log in directly on the server?
07:45
If not, you just haven't set up the printer, it's not an ltsp issue
07:45
<fnurl>
oh hay alkisg, sorry I thought you'd afk'd
07:45
yeah, the printer is setup in ubuntu
07:46
<alkisg>
So you can print from the server?
07:46
<fnurl>
just the thin clients/raspberry pi's cant see it
07:46
yep - can print from the server
07:46
the LTSP is based on pinet if that makes a difference
07:46
<alkisg>
It doesn't make a difference, but what you're saying doesn't make much sence,
07:46
are you sure that you're using the pi's as thin clients and not as fat clients?
07:47
If you open a terminal in a pi client, do you see user@server or user@ltsp123 ?
07:47
<fnurl>
1s lemme check
07:47
apologies for lack of clarity
07:49
http://imgur.com/zaBJjSI
07:50
<vmlintu>
muppis: I'd really recommend fatclients if you want to make them work nicely..
07:50
<fnurl>
i'm using epoptes to access the thin client, the account doesn't have sudo permission
07:50
vmlintu: we've invested in 10 raspberry pi
07:50
<muppis>
vmlintu, lack of RAM forces to use thins.
07:50
<fnurl>
but yeah, i'm thinking that edubuntu might be easier to work with
07:51
the previous machines are XP, and the server is 2003, so it's all EOL
07:51
the new server is a qnap NAS, and the ubuntu is a VM
07:52
<alkisg>
fnurl: you're using the pi's as fat clients
07:52
<fnurl>
ahhhhhhhh!
07:52
<alkisg>
Why do you think edubuntu is not the same as ltsp?
07:52
<fnurl>
i just reread your question
07:52
<alkisg>
!cups
07:52
<ltsp>
cups: Recent cups versions have issues with the hostname, either set 'ServerAlias server' in <server>/etc/cups/cupsd.conf, or 'CUPS_SERVER="$SERVER"' in lts.conf so that it's accessed by its ip
07:52
<fnurl>
i assumed the pinet was a customized LTSP
07:52
<alkisg>
Put this line in your lts.conf:
07:53
CUPS_SERVER="$SERVER"
07:53
<fnurl>
if you have fixed this issue, i will forever be in your debt, afterlife included
07:53
<alkisg>
AFAIK, pinet is a few scripts that try to help people install LTSP on pi. I don't know if they do a good job at that, but upstream LTSP is what makes it running, it's not a fork.
07:54
Haha, no please, even my wife said "till death do us apart", I want no obligations for the afterlife :D
07:54
<fnurl>
http://imgur.com/qA4N24P
07:55
^^ thats the lts.conf as I see it
07:55
<alkisg>
Right, add the line that I said, and also enable printer sharing in your server cups' options
07:55
<fnurl>
i can chmod that to 777, insert the line, then chmod it back to 755, and it's all good ??
07:55
<alkisg>
http://cdn.makeuseof.com/wp-content/uploads/2014/10/muo-piprint-cups-share.png?fa45c6
07:56
<fnurl>
sharing is enabled in cups
07:56
<alkisg>
...why chmod?
07:56
sudo nano /var/lib/tftpboot/ltsp/<arch>/lts.conf
07:56
<fnurl>
nano says no write permission
07:57
<alkisg>
Did you put sudo in front of it?
07:57
<muppis>
!vlc
07:57
<ltsp>
I do not know about 'vlc', but I do know about these similar topics: 'ver', 'vga', 'v'
07:59
<fnurl>
alkisg: dw, just me i think
07:59
http://imgur.com/sexhMc1
07:59
<alkisg>
Save, reboot the pi and check
08:00
<fnurl>
last question -i don't need to change the fat_client=true?
08:00
http://imgur.com/BRgYTPP
08:00
sorry, couldn't see in that pic
08:01
but yeah, i'm remote at the minute, I'm gonna re-do the image etc, will be able to report back in 20 minutes, the headmaster is collecting students at the moment
08:05
http://imgur.com/v4FRCmz http://imgur.com/TtLCZSu
08:05
updating image now, thanks v much for your help, lifelong debt or otherwise :)
08:11
<alkisg>
fnurl: you shouldn't be using /opt/ltsp/armhf/etc/lts.conf, but /var/lib/tftpboot/ltsp/armhf/lts.conf
08:11
So that you don't need to run ltsp-update-image every time you update lts.conf
08:12
<fnurl>
ahhhh, that's awesome to know
08:12
because yeah, updating the image and switching cards, is getting a little long-in-the-tooth
08:13
now that i've done it this way it's good to go though, I'll switch the line to the var/.../ later on
08:13
<muppis>
vmlintu, I made special vlc.desktop which launches vlc as localapp.
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08:31
<fnurl>
alkisg: you sire are a hero, the printer is now shoing up on the thin client
08:31
<alkisg>
Cool, but don't say "thin client", it's a "fat client"
08:31
<fnurl>
but I just noticed, when epoptes starts, it identifies the pi as FAT
08:32
<alkisg>
It messes up the instructions that we give here
08:32
If you ask instructions for thin clients, they're different than fat clients
08:32
<fnurl>
yeah, i can understand that
08:32
sorry, but yeah, i think you identified that as the issue immediately, much appreciated
08:33
<alkisg>
Well, I did give you instructions 2 days ago as well, but they were for thin clients
08:33
<fnurl>
if I changed http://imgur.com/BRgYTPP <--- that line to read LTSP_FATCLIENT=FALSE, would it be that easy?
08:34
apols, was that on friday?
08:34
<alkisg>
That would make your clients thin clients. Then they would run on the server CPU, and automatically see the server printers
08:34
And of course it would strain your server CPU and local network
08:35
<fnurl>
overhead & strain isn't a huge concern
08:35
<alkisg>
!flash
08:35
<ltsp>
flash: Yes, flash sucks. An HD full screen 30 fps video needs 2.5 Gbps bandwidth (1920×1080×4×30)! Make sure you have LDM_DIRECTX=True in your lts.conf file, or if it's just youtube you're after, try some flash replacing plugin like http://linterna-magica.nongnu.org
08:36
<alkisg>
Anyway you can test both LTSP_FATCLIENT=True/False and see what works better in your environment
08:36
Without spending time to understand the theory behind it...
08:36
<fnurl>
flash is a thing I was planning on dealing with next
08:37
<alkisg>
It's not just about flash, thin clients put a big strain on the local network. If it's all gigabit, it's usually acceptable though.
08:37
<fnurl>
the network has been upgraded to Gb/E, and the NAS is only holding this ubuntu VM and general storage
08:38
i'd like to think i understand most of the theory behind LTSP, but, i must admit, i honestly thought the pinet would be set to thin out of the box, so to speak
08:38
bad assumption on my part
08:38
but, thanks very much for your help today, it's very very much appreciated
08:39
90~ kids, 10 teachers, and 1 me owe you a favour :)
08:39
<alkisg>
You're welcome, you're the 100th school that I've helped since 1st of September :D
08:40
<fnurl>
seriously!
08:40
<alkisg>
http://www.ltsp.org/stories/widget-map/?location=Greece
08:40
<fnurl>
in 6 days, that's very very impressive
08:40* alkisg is a remote sysadmin for these schools...
08:40
<fnurl>
ahhh, k
08:40
<alkisg>
Kids here come at 10th of september
08:40
So from 1 to 10th the teachers maintain their pc labs
08:41
<fnurl>
no doubt
08:41
this isn't my school, the guy who owns/runs it is a friend
08:42
he asked for help planning an upgrade, getting on windows was key as was affordability (a story you've heard no doubt)
08:42
on // off :/
08:43* alkisg doesn't like pi's much though, their CPUs are very low spec'ed
08:44
<fnurl>
yeah, i'm the same - i think they're suitable for little kids libraries and so on though
08:44
or actually very limited classroom activities
08:44
<alkisg>
No, because they need web browsing + multimedia, and pi's are not good for that...
08:44
<fnurl>
for my part, since I started looking at this, I'm wanting to deploy an LTSP of my own
08:44
<alkisg>
I think they're only good for text editors, programming, and maybe watching a movie if acceleration is working...
08:45
<fnurl>
that makes sense, I pulled off the minecraft installation, and the scratch installation too
08:46
i'm not sure the headmaster wants too much in the way of web browsing anywhere in the school
08:47
i'll be writing up a case study for this school as it is, i'll submit it to the LTSP stories
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