IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 2 December 2015 (all times are UTC)
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| 05:14 | work_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:
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| 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
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| 06:02 | nc would be better, but wget is already there, and in the future it'll work with ltspd too, so... :)
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| 06:03 | * vagrantc likes that it's a feature to be enabled | |
| 06:03 | <vagrantc> and configurable port...
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| 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 }')
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| 06:12 | <vagrantc> in initramfs?
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| 06:14 | <alkisg> Yup
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| 06:14 | I think I'll put it as part of our udhcpc script
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| 06:15 | if it doesn't detect rootserver, and some cmdline switch is enabled, it'll essentially just set rootserver
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| 06:16 | <vagrantc> the "udhcp" script that doesn't even necessarily use udhcp
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| 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
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| 06:18 | I don't think I actually ever used udhcp
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| 06:18 | <vagrantc> the rest is history!
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| 06:18 | <alkisg> :)
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| 06:18 | <vagrantc> i guess i'm hinting at ... does it need to be the same script?
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| 06:19 | <alkisg> It's where we do all the work about ROOTSERVER
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| 06:19 | Does it make sense to put it elsewhere?
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| 06:21 | * vagrantc shrugs | |
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| 06:31 | <alkisg> http://paste.debian.net/340524/
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| 06:50 | Hmm, it needs 50MB RAM temporarily, oh well
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| 06:50 | <vagrantc> ouch
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| 06:51 | <alkisg> 1 sec execution time in vbox
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| 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
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| 07:32 | * vagrantc wonders how debian would fare | |
| 07:33 | <alkisg> Eeeew the initrd is 34 MB!!!
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| 07:34 | <highvolt1ge> ew!
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| 07:35 | systemd is pretty big though.
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| 07:37 | <alkisg> ...it's not gzipped, not cpio... /me checks what that is...
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| 07:37 | initrd.img-4.2.0-19-generic: ASCII cpio archive (SVR4 with no CRC)
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| 07:40 | <highvolt1ge> ah you can compress it with xz too these days (which you probably already know) whic is quite useful.
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| 07:41 | <alkisg> I tried to zip it, it can't be further compressed, so it surely has a lot of things there
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| 07:41 | But I can't find a way to decompress it yet
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| 07:41 | I'm getting only a small "kernel" dir with 25 kb contents out of it
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| 07:46 | Inside the initramfs>, I see it has a whole lot of kernel modules included, for the network, gpu etc
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| 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
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| 08:06 | <alkisg> highvolt1ge: it will be tough to find out which modules to exclude by default though
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| 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
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| 08:08 | -rw-r--r-- 1 root root 34M Δεκ 2 10:07 initrd.img-4.2.0-19-generic.most
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| 08:10 | Well, even with just 6 MB down, the VM booted with 128 MB RAM :)
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| 08:21 | <highvoltage> nice
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| 08:40 | <irachovits_> alkisg:
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| 08:40 | <alkisg> !greek | echo irachovits_:
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| 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
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| 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.
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| 21:06 | <vagrantc> m3741: there's no simple answer to that question ...
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| 21:06 | m3741: it's a bit broad
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| 21:06 | <championofcyrodi> i would say the thin client is mostly just running X
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| 21:07 | broad answer for a broad question :p
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| 21:07 | <vagrantc> localdevs and makes that a bit more complicated
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| 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?
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| 21:09 | <championofcyrodi> and SSH determines whether or not you can get anything to happen
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| 21:09 | server
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| 21:09 | <m3741> ah, ok.
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| 21:09 | can you elaborate on your ssh comment?
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| 21:10 | <championofcyrodi> when a client is connected... the only real connection underneath is an SSH connection.
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| 21:10 | with X11 forwarding enabled
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| 21:10 | <m3741> outside of like nbd, correct?
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| 21:10 | <championofcyrodi> yea
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| 21:10 | <m3741> ok, nifty.
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| 21:10 | <championofcyrodi> but NBD is just for the image running on the client
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| 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?
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| 21:11 | <championofcyrodi> so if thin, the image is pretty much just Xserver and some core components.
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| 21:11 | if FAT, then NBD image is the WHOLE OS
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| 21:11 | <m3741> aaaahhhhhh
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| 21:11 | <championofcyrodi> and SSH is just used for authenticating login and mounting home folder
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| 21:12 | but not always you could use NFS
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| 21:12 | (for home folder)
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| 21:12 | <vagrantc> m3741: if doing a true thin client, typically you would only modify the image for security updates and such.
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| 21:12 | though honestly, considering what hardware is like these days, fat clients frequently make more sense
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| 21:14 | <m3741> @vagrantc agreed
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| 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
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| 21:14 | <vagrantc> and when i say fat clients, i mean LTSP fat clients, still booting off the network
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| 21:14 | <m3741> something in lts.conf that i'm not finding
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| 21:15 | @vagrantc, yeah, gotcha.
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| 21:15 | <championofcyrodi> when you say non-persistent... you mean physically or logically?
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| 21:15 | like RAM or /tmp ?
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| 21:15 | <vagrantc> m3741: throwaway homedirs?
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| 21:15 | m3741: there are a number of ways to implement that
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| 21:15 | <m3741> yeah, throwaway homedirs essentially. like if your home directory was in a ramdisk
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| 21:15 | <vagrantc> m3741: but no simple "turn it on" feature yet ...
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| 21:16 | <m3741> when the user logs out anything about their session is gone
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| 21:16 | <championofcyrodi> if your homedir was a ramdisk, a reboot would throw it away automatically.
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| 21:16 | <vagrantc> for each client logout, you probably don't want to reboot your server ... :)
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| 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?
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| 21:16 | heh, no. i don't
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| 21:17 | <vagrantc> m3741: there have been a number of methods on the ltsp-discuss mailing list over the years
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| 21:17 | <championofcyrodi> m3741: it's starting to sound like you'll probably want to start getting involved with customizing the initrd
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| 21:17 | <vagrantc> m3741: basically, you can have LDM rsync it to a clean slate at login
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| 21:17 | no need to mess with the initrd
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| 21:18 | either that, or using libpam-mount to mount and unmount a tmpfs homedir
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| 21:18 | <m3741> that would probably work
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| 21:18 | oh yeah, that might even be better
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| 21:18 | <vagrantc> i've got a setup like that with autologin for unauthenticated users on fat clients
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| 21:19 | <championofcyrodi> i guess you could just add a tmp entry in to fstab
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| 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
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| 21:20 | <vagrantc> m3741: for thin clients, yes ...
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| 21:20 | <m3741> alright. nifty.
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| 21:21 | <vagrantc> championofcyrodi: fstab wouldn't handle per-session mounts ...
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| 21:23 | <championofcyrodi> thats true, i forgot PAM supports session modules
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| 21:23 | and that there was a 'mount' module
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| 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
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| 21:24 | running ltsp-update-image 5.5.1-1ubuntu2 on ubuntu 14.04 x64
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| 21:29 | i'm gonna go beat on some things. thanks for all of the help!
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| 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
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| 22:25 | <vagrantc> there are plenty of other options...
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| 22:25 | !proxydhcp
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| 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
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| 22:25 | <vagrantc> m3741: ^^^
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| 22:26 | <m3741> vagrantc: uhh, nifty. will investigate. thx!
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| 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)
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