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


Channel log from 2 December 2015   (all times are UTC)

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05:14work_alkisg is now known as alkisg
05:36* alkisg is implementing the subnet pinging solution to detect the server... :)
06:02
<alkisg>
something like, if ltsp.scan4port=10809 is in cmdline:
06:02
i=0; while [ $i -lt 255 ]; do i=$(($i+1)); { wget -q 10.161.254.$1:10809 -O /dev/null 2>&1 | grep -q reset && echo 10.161.254.$i; } & done
06:02
nc would be better, but wget is already there, and in the future it'll work with ltspd too, so... :)
06:03* vagrantc likes that it's a feature to be enabled
06:03
<vagrantc>
and configurable port...
06:04
<alkisg>
Sure, it's only for locally booted kernel/initrd, which will have that in the local cmdline
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06:09
<alkisg>
Meh, no killall available, so: kill $(ps | awk '/wget/ { print $1 }')
06:12
<vagrantc>
in initramfs?
06:14
<alkisg>
Yup
06:14
I think I'll put it as part of our udhcpc script
06:15
if it doesn't detect rootserver, and some cmdline switch is enabled, it'll essentially just set rootserver
06:16
<vagrantc>
the "udhcp" script that doesn't even necessarily use udhcp
06:17
<alkisg>
Well, stgraber wrote an initial version of udhcp, but at that point I wanted to support the proxydhcp case, so I had to put my code there
06:18
I don't think I actually ever used udhcp
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06:18
<vagrantc>
the rest is history!
06:18
<alkisg>
:)
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06:18
<vagrantc>
i guess i'm hinting at ... does it need to be the same script?
06:19
<alkisg>
It's where we do all the work about ROOTSERVER
06:19
Does it make sense to put it elsewhere?
06:21* vagrantc shrugs
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06:31
<alkisg>
http://paste.debian.net/340524/
06:50
Hmm, it needs 50MB RAM temporarily, oh well
06:50
<vagrantc>
ouch
06:51
<alkisg>
1 sec execution time in vbox
06:51
It'll have to do until we implement ltspd :)
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07:32
<alkisg>
Ouch I tried setting the VM to128 MB RAM and the Ubuntu 16.04 kernel crashed with out of RAM before getting to launch the initramfs
07:32* vagrantc wonders how debian would fare
07:33
<alkisg>
Eeeew the initrd is 34 MB!!!
07:34
<highvolt1ge>
ew!
07:35
systemd is pretty big though.
07:37
<alkisg>
...it's not gzipped, not cpio... /me checks what that is...
07:37
initrd.img-4.2.0-19-generic: ASCII cpio archive (SVR4 with no CRC)
07:40
<highvolt1ge>
ah you can compress it with xz too these days (which you probably already know) whic is quite useful.
07:41
<alkisg>
I tried to zip it, it can't be further compressed, so it surely has a lot of things there
07:41
But I can't find a way to decompress it yet
07:41
I'm getting only a small "kernel" dir with 25 kb contents out of it
07:46
Inside the initramfs>, I see it has a whole lot of kernel modules included, for the network, gpu etc
07:46
20 MB /lib/firmware and 40 MB /lib/modules
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08:05
<highvolt1ge>
alkisg: you can tweak /etc/initramfs-tools/initramfs.conf to include less modules. not sure about what you're going to use it for but you might not need all those modules
08:06
<alkisg>
highvolt1ge: it will be tough to find out which modules to exclude by default though
08:06highvolt1ge is now known as highvoltage
08:06
<alkisg>
modules=net might be better than modules=most, but it's untested in ltsp...
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08:08
<alkisg>
-rw-r--r-- 1 root root 28M Δεκ 2 10:08 initrd.img-4.2.0-19-generic.netboot
08:08
-rw-r--r-- 1 root root 34M Δεκ 2 10:07 initrd.img-4.2.0-19-generic.most
08:10
Well, even with just 6 MB down, the VM booted with 128 MB RAM :)
08:21
<highvoltage>
nice
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08:40
<irachovits_>
alkisg:
08:40
<alkisg>
!greek | echo irachovits_:
08:40
<ltsp>
irachovits_: greek: Στο παρόν κανάλι μιλάνε μόνο Αγγλικά, για υποστήριξη στα Ελληνικά από την υπηρεσία Τεχνικής Στήριξης ΣΕΠΕΗΥ διαβάστε το http://ts.sch.gr/wiki/IRC και στη συνέχεια πληκτρολογήστε /j #ts.sch.gr
08:40
<alkisg>
irachovits_: την άλλη καρτέλα κοίτα, στο #ts.sch.gr
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13:24
<muppis>
Does anyone know is rpi2's Ubuntu 14.04 Chromium build with gpu support?
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21:03
<m3741>
Hey channel. i'm curious, what does the thin client image actually handle? it is what is booted when a client boots i know, but where's the deliniation between what the server handles (auth, programs, etc) and what the client handles? i'm thinking in terms of thin clients here, not fat ones.
21:06
<vagrantc>
m3741: there's no simple answer to that question ...
21:06
m3741: it's a bit broad
21:06
<championofcyrodi>
i would say the thin client is mostly just running X
21:07
broad answer for a broad question :p
21:07
<vagrantc>
localdevs and makes that a bit more complicated
21:09
<m3741>
fair enough. to narrow it down to one thing that i'm trying to accomplish, where would customization things like /etc/skel go? on the server? in the thin client image?
21:09
<championofcyrodi>
and SSH determines whether or not you can get anything to happen
21:09
server
21:09
<m3741>
ah, ok.
21:09
can you elaborate on your ssh comment?
21:10
<championofcyrodi>
when a client is connected... the only real connection underneath is an SSH connection.
21:10
with X11 forwarding enabled
21:10
<m3741>
outside of like nbd, correct?
21:10
<championofcyrodi>
yea
21:10
<m3741>
ok, nifty.
21:10
<championofcyrodi>
but NBD is just for the image running on the client
21:11
<m3741>
is there a point to really changing anything in the client image, other than to do an apt-get update and upgrade on occasion?
21:11
<championofcyrodi>
so if thin, the image is pretty much just Xserver and some core components.
21:11
if FAT, then NBD image is the WHOLE OS
21:11
<m3741>
aaaahhhhhh
21:11
<championofcyrodi>
and SSH is just used for authenticating login and mounting home folder
21:12
but not always you could use NFS
21:12
(for home folder)
21:12
<vagrantc>
m3741: if doing a true thin client, typically you would only modify the image for security updates and such.
21:12
though honestly, considering what hardware is like these days, fat clients frequently make more sense
21:14
<m3741>
@vagrantc agreed
21:14
one more question if you don't mind. is there a way to make non-persistent storage for users? i know i could just put down a pretty tight quota, but i'm wondering if there's an "official" way of doing it
21:14
<vagrantc>
and when i say fat clients, i mean LTSP fat clients, still booting off the network
21:14
<m3741>
something in lts.conf that i'm not finding
21:15
@vagrantc, yeah, gotcha.
21:15
<championofcyrodi>
when you say non-persistent... you mean physically or logically?
21:15
like RAM or /tmp ?
21:15
<vagrantc>
m3741: throwaway homedirs?
21:15
m3741: there are a number of ways to implement that
21:15
<m3741>
yeah, throwaway homedirs essentially. like if your home directory was in a ramdisk
21:15
<vagrantc>
m3741: but no simple "turn it on" feature yet ...
21:16
<m3741>
when the user logs out anything about their session is gone
21:16
<championofcyrodi>
if your homedir was a ramdisk, a reboot would throw it away automatically.
21:16
<vagrantc>
for each client logout, you probably don't want to reboot your server ... :)
21:16
<m3741>
is there an easy way to tell ltsp to use local RAM as the ramdisk for the session? at least for a user's home dir?
21:16
heh, no. i don't
21:17
<vagrantc>
m3741: there have been a number of methods on the ltsp-discuss mailing list over the years
21:17
<championofcyrodi>
m3741: it's starting to sound like you'll probably want to start getting involved with customizing the initrd
21:17
<vagrantc>
m3741: basically, you can have LDM rsync it to a clean slate at login
21:17
no need to mess with the initrd
21:18
either that, or using libpam-mount to mount and unmount a tmpfs homedir
21:18
<m3741>
that would probably work
21:18
oh yeah, that might even be better
21:18
<vagrantc>
i've got a setup like that with autologin for unauthenticated users on fat clients
21:19
<championofcyrodi>
i guess you could just add a tmp entry in to fstab
21:19
<m3741>
setting up libpam-mount would be done on the server, correct? sorry for the double-ask but i just want to make sure i'm not chasing my tail anymore
21:20
<vagrantc>
m3741: for thin clients, yes ...
21:20
<m3741>
alright. nifty.
21:21
<vagrantc>
championofcyrodi: fstab wouldn't handle per-session mounts ...
21:23
<championofcyrodi>
thats true, i forgot PAM supports session modules
21:23
and that there was a 'mount' module
21:24
<m3741>
so i lied, another question... what generates the ltsp tftp config file? i have my ltsp stuff under /srv/ltsp and /srv/tftp/ltsp instead of under /opt/<whatever> and it neglects to put the nbdhost and nbdroot lines in there
21:24
running ltsp-update-image 5.5.1-1ubuntu2 on ubuntu 14.04 x64
21:29
i'm gonna go beat on some things. thanks for all of the help!
21:32
<vagrantc>
m3741: ideally, it doesn't need them- pass it via DHCP's root-path
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22:20
<m3741>
vagrantc: ok, np. i don't have direct control over the dhcp server so it's not easily an option. i'll just keep my hack in place for now. thx
22:25
<vagrantc>
there are plenty of other options...
22:25
!proxydhcp
22:25
<ltsp>
proxydhcp: A proxy DHCP server is defined by the PXE specification as a server which sends auxiliary boot information to clients, like the boot filename, tftp server or rootpath, but leaves the task of IP leasing to the normal DHCP server. More info: https://help.ubuntu.com/community/UbuntuLTSP/ProxyDHCP
22:25
<vagrantc>
m3741: ^^^
22:26
<m3741>
vagrantc: uhh, nifty. will investigate. thx!
22:27
<vagrantc>
if all else fails, you edit /etc/ltsp/update-kernels.conf in the client chroot (e.g. /opt/ltsp/amd64/etc/ltsp/update-kernels.conf)