IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 17 May 2015 (all times are UTC)
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| 08:13 | <aruke> Is it possible to run commands on the server from within a local-app. Eg. map a file open action in a local-app firefox to open the file in a application runnin on the server? A sort of reverse ltsp-localapps?
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| 08:17 | <Paul_> Good Morning
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| 08:18 | I am going to use the ltsp with fat clients. I have got 1 problem und 1 question. Maybe anyone could help me
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| 08:19 | <aruke> Paul_: What is your question?
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| 08:20 | <Paul_> The Problem: I use Fluxbox as X on the fat client. It is not possible to login in until i delete the ./fluxbox/startup file. This file is autogenerated on every login. So, after every login i have to delete the startup file to let me login later again
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| 08:23 | <aruke> That seems to be an issue with fluxbox not ltsp. A quick search gave me this: when you start fluxbox in your ~/.xinitrc, use 'startfluxbox' instead of fluxbox
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| 08:24 | <Paul_> The Question: Is there any script which copies and mounts the ltsp files on a ramdisc to speed up the ltsp fat client which come without own hdd oder sdd
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| 08:30 | <aruke> Paul_, That question is beyond me. I know there is an option to mount a local swap partition using USE_LOCAL_SWAP=True in lts.conf (read the manual for more info). vagrantc and alkisg are the real knowhows on the subject, and will hopefully be able to provide you with some additional info. Then dont seem to be here at the moment, but stay online and perhaps you can catch them later.
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| 08:39 | Paul_, any luck with fluxbox?
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| 10:21 | <gdi2k> I've asked this a couple of times before but no answer yet... does anyone know where the SSHFS options are that mount the home directory for fat clients? I am interested in experimenting with the compression and cipher options to see if performance can be enhanced.
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| 17:45 | <alkisg> !arcfour
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| 17:45 | <ltsp`> arcfour: http://en.wikipedia.org/wiki/RC4 is an SSH cipher which is more than 2 times faster than the default aes128-ctr. To enable it, set LDM_SSHOPTIONS="-o Ciphers=arcfour128".
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| 17:45 | <alkisg> gdi2k: ^
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| 17:46 | aruke: google for ltsp remoteapps
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| 17:46 | There's an lts.conf setting to enable them
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| 17:47 | <gbaman> any suggestions alkisg for best way for client to know the server IP address after it has booted?
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| 17:47 | Have a funny feeling, was there a set environmental variable?
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| 17:47 | <alkisg> The clients know the server by the hostname server and it's declared in /etc/hosts
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| 17:47 | dynamically on the clients
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| 17:48 | <gbaman> As am needing a way to keep the clients time up to date, as Pis don't have an RTC, but the server will
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| 17:49 | <alkisg> TIMESERVER=server then, and install ntpd on the server
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| 17:49 | What do you mean " pis don't have an rtc"? When they boot they don't have the correct date?
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| 17:49 | (e.g. at initramfs... they dont?!)
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| 17:50 | <gbaman> Nope :)
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| 17:50 | <alkisg> Wow...
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| 17:50 | <gbaman> RTCs cost money
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| 17:50 | <alkisg> vagrantc: about that ^
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| 17:50 | It also happens on old desktop pcs where the cmos battery has ran out
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| 17:50 | <gbaman> They usually give it a go to fetch it off the web, if not they just use their last known time
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| 17:50 | <alkisg> I was thinking that ltspd could send SERVER_DATE=xxx in initramfs getltsconf stage
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| 17:51 | And either the clients can use that immediately, before allowing the ntpdate service to take its own time to sync the clock,
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| 17:51 | or they can only use it if they detect that the date is wrong, by e.g. checking that initramfs vmlinuz date is greater than the system date
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| 17:52 | There are some issues when you boot with the wrong date, e.g. fsck scans the file systems and reports "error: superblock date is in the future"
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| 17:53 | So it's nice to be able to fix it, even if at a second or minute precision, at initramfs stage
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| 17:53 | (gbaman, for your setup just use ntpd and TIMESERVER lts.conf variable)
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| 17:54 | <gbaman> That is sounding surprisingly simple...
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| 17:54 | Anything need installed on the client?
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| 17:54 | <alkisg> No, ntpdate should already be installed
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| 17:55 | <gbaman> Ok, will give it a go
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| 17:55 | <alkisg> Just note that the time will get fixed at about the time the clients show the ldm screen, or even a few seconds after that
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| 17:55 | <gbaman> That is better than right now :)
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| 17:56 | <alkisg> If you want that sooner, you can use INIT_COMMAND_01="ntpdate -s server" or something similar
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| 17:56 | In lts.conf again, with ntdp on the server again
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| 17:57 | Or even INIT_COMMAND_01="ntpdate -s ntp.ubuntu.com &" without ntpd on the server :)
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| 17:58 | <gbaman> Timeserver variable is blank on client
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| 17:58 | Well, $TIMESERVER is blank
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| 17:59 | <alkisg> Is it there in getltscfg -a?
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| 17:59 | <gbaman> It didn't seem to like using the word server
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| 17:59 | TIMESERVER="server"
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| 18:00 | Says it was exported though, but yet $TIMESERVER is still empty
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| 18:02 | <gp> If you have internal DNS you could try the fqdn. I find it is easier to keep track of targets when using actual fqdn instead of local references
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| 18:02 | <gbaman> Can't assume that sadly
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| 18:03 | Is for PiNet, so whatever method is chosen, can't depend on end user having extra stuff
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| 18:03 | <alkisg> gbaman: when is it empty?
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| 18:03 | <gbaman> On the client
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| 18:03 | <alkisg> At what time are you checking that?
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| 18:03 | <gbaman> On the desktop?
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| 18:03 | <alkisg> With e.g. SCREEN_02=shell?
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| 18:03 | LTSP variables are not exported on the desktop
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| 18:03 | <gp> gotcha
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| 18:03 | <alkisg> They're there when the ltsp scripts run though
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| 18:04 | <gbaman> Am assuming then the issue is that it didn't like "server"
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| 18:04 | <alkisg> Try the last command I proposed
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| 18:04 | INIT_COMMAND_01="ntpdate -s ntp.ubuntu.com &"
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| 18:04 | <gbaman> Don't want to use a web based ntp server
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| 18:04 | <alkisg> Does it work though?
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| 18:04 | If it does, just replace ntp.ubuntu.com with server
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| 18:05 | And install ntpd in the ltsp server
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| 18:05 | <gbaman> But I don't know the server IP address
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| 18:05 | <alkisg> You know its dns name
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| 18:05 | It's "server"
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| 18:05 | <gbaman> server?
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| 18:05 | <alkisg> Yes
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| 18:05 | <gbaman> Ok
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| 18:05 | <alkisg> Try it as I said
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| 18:06 | First ntp.ubuntu.com, then check if it works, then put "server"
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| 18:06 | <gbaman> Ok, waiting for image to compress
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| 18:06 | <alkisg> Why?
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| 18:06 | Just boot using the old one
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| 18:06 | ...while it compresses (even if it's not needed to update it...)
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| 18:06 | You don't need to update the image every time you update lts.conf...
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| 18:07 | <gbaman> Yeah, the lts.conf is inside the chroot
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| 18:07 | It is in /etc
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| 18:07 | <alkisg> Why so?
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| 18:07 | <gbaman> Remember we don't use tftpboot
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| 18:07 | <alkisg> Why so?
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| 18:08 | <gbaman> Because the Pis boot off the SD card
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| 18:08 | <alkisg> It's ok not to boot via tftp,
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| 18:08 | but why not use tftp to get lts.conf?
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| 18:08 | <gbaman> Because PiNet doesn't grab anything from tftp
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| 18:08 | <alkisg> Isn't that dumb?
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| 18:08 | <gbaman> No?
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| 18:08 | <alkisg> You can easily get lts.conf from tftp
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| 18:08 | Why refuse to do so?
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| 18:08 | <gbaman> The lts.conf doesn't change much :)
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| 18:09 | Why add more work?
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| 18:09 | <alkisg> It's the default in ltsp
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| 18:09 | Why do you say it's more work?
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| 18:09 | <gbaman> Requires me to go and figure out how to make it do that
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| 18:09 | <alkisg> Let ltsp do it for you, it's the default
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| 18:09 | <gbaman> I never told it not to
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| 18:09 | <alkisg> Just don't use a local lts.conf
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| 18:10 | gbaman, how are you telling the clients to find the server?
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| 18:10 | Aren't you using dhcp at initramfs stage?
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| 18:10 | <gbaman> Nope
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| 18:10 | It is in the cmdline.txt file on the SD cards
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| 18:10 | Can't assume the user has access to the DHCP server
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| 18:10 | <alkisg> They have access to the ltsp server, but not to the dhcp server?
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| 18:10 | <gbaman> Many are plugging it straight into their school networks
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| 18:10 | <alkisg> I think you have a very broken setup then...
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| 18:11 | <gbaman> Remember, PiNet was designed to be incredibly simple
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| 18:11 | <alkisg> As was ltsp-pnp
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| 18:11 | <gbaman> Pis don't use pxe booting
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| 18:11 | <alkisg> The users put clients to the school network and it works
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| 18:11 | They can also use local kernels and initrds
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| 18:11 | It still works
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| 18:11 | Anyway, if you ever care to do it properly, ping me :)
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| 18:11 | Cheers for now
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| 18:12 | <gbaman> If there was a way to without touching the DHCP server to not have the IP address on the cards, I would be very interested
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| 18:12 | <alkisg> Yes we never touch the dhcp server that the schools have, it's usually on a cheap router
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| 18:12 | Anyway, later, cheers for now... :)
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| 19:19 | <vagrantc> regarding early time sync, you can install "fake-hwclock" or enable systemd's timesyncd (which is kind of like fake-hwclock + ntp)
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| 19:20 | work_alkisg: given that there are numerous other options to set the time, i'm not sure having an ltsp-specific way is a great idea.
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| 19:20 | but it wouldn't be hard to implement
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| 19:21 | would be an easy hook to the initramfs to check it's own build date and set the time to that on boot
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| 19:21 | (if the hwclock is well behind it, anyways)
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| 22:29 | <gdi2k> work_alkisg, thanks for the info re arcfour, that's what I was looking for. will play with it today to see if it makes any difference...
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