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


Channel log from 18 September 2017   (all times are UTC)

00:59dummy has joined IRC (dummy!b9a20bd9@gateway/web/freenode/ip.185.162.11.217)
00:59
<dummy>
hello there, guys
01:00
have a quick question
01:00dummy is now known as Guest35322
01:00
<Guest35322>
can I somehow choose a user when logging in from thin client?
01:01
i mean smth like dropdown with usernames to choose
01:12
<vagrantc>
Guest35322: there isn't a way to do that
01:12
Guest35322: as the LTSP thin clients don't have a list of users
01:17
<Guest35322>
thx
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05:45
<alkisg>
!local
05:45
<ltsp>
I do not know about 'local', but I do know about these similar topics: 'install-localapp', 'localdev', 'RDP-localdev', 'LocaldevCommonGroupWorkaround', 'localxterm', 'local-disks', 'local-boot', 'localapps'
05:46
<alkisg>
!local-disks
05:46
<ltsp>
local-disks: On fat clients, only sudoers have access to local disks. One way to give access to non sudoers, is to put in lts.conf: RCFILE_01="mkdir -p /media/local_disk && mount /dev/sda1 /media/local_disk"
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08:06
<alkisg>
!jetpipe
08:06
<ltsp>
jetpipe: (#1) Jetpipe -script has founded to be unstable in some cases. You can try C written (but limited) Jetpipe from GitHub https://github.com/bilange/jetpipe or switch it to USB/IP and use these scripts http://pastebin.com/Ltdi2TCL Support AIO devices as well., or (#2) jetpipe has a bug in some Ubuntu versions, to manually start it, put something like this in lts.conf: RCFILE_01="/usr/sbin/jetpipe /dev/usb/lp0 9100 &"
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10:33
<ogra_>
alkisg, s/founded/found/ :)
10:34
(or rather "been found")
10:56
<alkisg>
ogra_: I didn't write that one :)
10:56
I only wrote (#2) there
10:56
<ogra_>
:)
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13:05
<mpwyn>
Anybody out there who exports the chroot via NFS?
13:07
More precisely, fat clients exported with NFS?
13:09
<alkisg>
mpwyn: it doesn't work in recent kernels
13:09
Why not use nbd instead?
13:10
(actually, overlayfs over nfs hasn't worked since the beginning, although I think it might work in very recent kernels or in the future)
13:11
<mpwyn>
I started out years ago using nbd but then switched to Debian, which used NFS.
13:11
<alkisg>
Debian has switched from NFS to NBD
13:12
Since stretch, I believe
13:12
Since overlayfs got in the kernel and aufs was no longer the default for overlays
13:12
<mpwyn>
The problem with NBD is that the clients have to reboot every time you recreate the image. Or is that not correct?
13:12
<alkisg>
(aufs worked for NFS)
13:12
Yes, it is. In what cases you don't reboot the client when you install software?
13:13
E.g. if you update systemd or udev or the kernel or libc, you should reboot anyway...
13:13
But if you install e.g. libreoffice, yeah, you would save a reboot there
13:13
It's also about 5 times faster than NFS though
13:13
So an occasional reboot vs 5 times faster... it's not really a comparison
13:14
<mpwyn>
I work at the Physics department at a university. I take care of several groups. When somebody asks for a new software package, it used to be that I could quickly install it and it would be instantly available.
13:15
<alkisg>
Yes, and it would require 10 times more RAM on the server, 10 times more lan bandwidth, and it would be 5 times slower
13:15
I think a reboot is a small compromise for all that
13:15
Eh, sorry, got carried away, the 2 first are for fat vs thin
13:15
Only the last one is nfs vs nbd
13:16
<mpwyn>
My users run jobs that can last days or weeks. I can't go requiring them to reboot whenever I make a change in the background
13:16
<alkisg>
LAN bandwidth is only 2.5 times lower with nbd
13:16
Of course not, they'll reboot whenever they want the new package
13:16
Not on every change that you do...
13:16
<mpwyn>
They're not forced to reboot when I recreate the image? I thought that was the case.
13:17
It's been a while since I've used NBD.
13:17
<alkisg>
No, unless they log out and ldm sees a new image and it automatically reboots because there's no user logged in
13:17
When a user is logged in, no action is taken at all
13:17
They can keep using the old image for months
13:17
<mpwyn>
OK, if that's the case then maybe I have no problem.
13:18
<alkisg>
Well if you insist on nfs, you could try a really new kernel, or manually install aufs
13:18
But it's not something that anyone else has done...
13:18
<mpwyn>
So the crux is that the clients copy the image locally or what?
13:18
<alkisg>
No of course not
13:19
What happens when you boot from a usb disk or stick?
13:19
The os loads the "sectors" it needs when it needs them
13:19
Exactly the same happens now over then et
13:19
net
13:19
So the image can be 50 GB, and the client may only have 512 MB RAM, with no issues
13:19
(a typical image is 1 GB)
13:19
<mpwyn>
I'll have huge images, though.
13:20
<alkisg>
No problem at all, except that it'll need half an hour when you run ltsp-update-image
13:20
Otherwise, the clients will still boot in under a sec
13:20
(and a lot faster than when using nfs)
13:20
*under a min, sorry
13:20
<mpwyn>
OK, I guess I just need to try NBD again. It seems that I was misunderstanding things.
13:21
I thought I remembered that every time I recreated the image everybody had to reboot.
13:21
<alkisg>
Give it a try, and if you see any issues, ping again... :)
13:21
I've been an ltsp developer since 2008, I don't remember that ever happenning
13:21
I don't know if it was so before my time
13:22
<mpwyn>
Then I must have been doing it wrong. I don't think I used it before 2008.
13:22
Thanks for your assitance. I'll try NBD.
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13:39
<bcg>
alkisg: I'm using chroot with NFS and overlayfs!
13:40
no... it's unionfs
13:49
<alkisg>
bcg: what does fedora live cd use, unionfs or overlayfs?
13:50
<bcg>
I don't remember.
14:00
device-mapper? See https://fedoraproject.org/wiki/LiveOS_image and https://fedoraproject.org/wiki/LiveOS_image/overlay
14:02
When doing the rhel7-work I remember that I tried to use overlayfs but just got deadlocks. Unionfs worked so I'm using it.
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14:32
<robp2175>
I am trying to configure LTSP for Raspberry Pis. I have followed these instructions: https://help.ubuntu.com/community/UbuntuLTSP/RaspberryPi
14:32
When I try to boot my RPi3 I get the rainbow screen.
14:37
<alkisg>
robp2175: using Ubuntu 16.04?
14:39
Did you see any error messages while following the wiki page instructions?
14:41
<robp2175>
None, everything looked good. using 14.04
14:42
<alkisg>
robp2175: that won't work, support was added later in the kernel
14:42
You'd need a newer kernel than the one available in 14.04. It's possible, but not recommended.
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14:44
<robp2175>
I used 14.04 because of the warning at the top of this page: https://help.ubuntu.com/community/UbuntuLTSP/RaspberryPi
14:44
It says "Warning: the stock Ubuntu 16.04 kernel currently seems to be unable to boot Raspberry Pi 2 and 3"
14:44
<alkisg>
robp2175: yes I uploaded a new kernel that works but forgot to remove the warning
14:45
...reformat :)
14:45
<robp2175>
OK, sounds good. I will start from scratch.
15:08* alkisg updated the wiki page...
16:14* Guest32437 rejoices at another upgrade to documentation!
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