IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 12 April 2019 (all times are UTC)
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| 07:08 | <Basnap> Hi there!
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| 07:08 | I am tryying for roughly 5 workdays to get VNC working on LTSP-clients
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| 07:09 | if you got any advice or can help I am grateful for that.
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| 07:09 | it looks like the VNC server needs to be started by the same person with gui/x-server. But who is the username of the user getting the ldm login screen of LTSP?
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| 07:14 | <alkisg> !epoptes
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| 07:14 | <ltsp> epoptes: Epoptes is a computer lab administration and monitoring tool. It works on Ubuntu and Debian based labs with LTSP or non-LTSP servers, thin and fat clients, standalone workstations, NX clients etc. More info: http://www.epoptes.org
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| 07:14 | <alkisg> Basnap: why would you use vnc instead of epoptes, which natively supports ltsp?
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| 07:14 | <Basnap> Oh sorry!
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| 07:14 | <alkisg> Then you can just click and get vnc access to any client, logged in or not, with much less resources etc
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| 07:15 | <Basnap> We have an edubuntu server on a customer of us
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| 07:15 | and would like to look at the clients directly from our company via VNC, anydesktop or the like
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| 07:15 | <alkisg> Are they using epoptes? If not, you can just setup epoptes so that it connects to you
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| 07:16 | <Basnap> (it doesn't help that the customer is supposed to have crappy internet, so going with vnc to the LTSP server itself (whcih works!) and then starting epoptes...well, will prob be very very slow)
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| 07:16 | They = the customer?
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| 07:16 | <alkisg> Yes
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| 07:16 | I mean, the server AND all the clients would be configured so that they'd be epoptes-clients of you
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| 07:16 | So you'd just click on any of them that you want
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| 07:16 | <Basnap> Just to get you right, you are suggesting the server and clients connect to a server within our company?
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| 07:17 | <alkisg> Yes
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| 07:17 | <Basnap> that's an idea at last - can epoptes be controlled from windows systems?
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| 07:17 | <alkisg> It's also easier, it doesn't require port forwarding on the client
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| 07:17 | The epoptes server needs to be a linux pc
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| 07:17 | <Basnap> We don't need to do port forwarding because we will get into their network via VPN
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| 07:17 | <alkisg> But you can access that linux pc from windows if you want
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| 07:18 | <Basnap> http://www.epoptes.org/documentation/windows-client
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| 07:18 | "No Windows port of epoptes-client currently exists and the developers have no plans to implement one in the near future. However, in case anyone's up to the task, here are some key parts that are needed. "
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| 07:18 | <alkisg> Nah, this didn't work out
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| 07:18 | Noone was interested :)
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| 07:18 | Another way would be to login to their server, run epoptes from there, and then if you want to control a client you'd run the vnc command to the client via epoptes
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| 07:19 | This allows you to only use windows in your office
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| 07:19 | <Basnap> Yes, but that's not optimal and they got slow internet.
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| 07:20 | <alkisg> The vnc connection would be direct
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| 07:20 | <Basnap> Anyways, also because I am interested whether it works then, what's the LTSP username of the user running LDM/x-server?
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| 07:20 | <alkisg> The only downside is that you need to login to the server first, in order to run the command to the client
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| 07:20 | It's "root"
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| 07:20 | <Basnap> meh
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| 07:20 | <alkisg> Well, xorg has been running as root for decades
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| 07:20 | <Basnap> Tried root before but didnt work with vnc, either X-org is not running completely or the authentification fails
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| 07:21 | <alkisg> It's only recently that some distros started running it as non-root
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| 07:21 | <Basnap> edubuntu 14.04.
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| 07:21 | <alkisg> You probably didn't manage to set up vnc server properly
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| 07:21 | <Basnap> it works on the LTSP server at least.
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| 07:22 | Are you familiar with VNC servers?
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| 07:22 | <alkisg> Sure, how else would I program epoptes? :)
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| 07:22 | <Basnap> I didnt know you did!
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| 07:22 | App looks solid bro!
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| 07:22 | <alkisg> LTSP too :)
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| 07:22 | <Basnap> great job methinks!
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| 07:23 | one issue with LTSP I had was figuring out how to change keyboard layout and enable numlock
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| 07:23 | like not looking where to look or where that login screen came from, but I solved it after 1 or 2 workdays
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| 07:24 | "x11vnc was unable to open the X DISPLAY; ":0" it cannot continue. There may be Xlib error messages above with details about the failure"
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| 07:24 | An X server (the one you with to view) must be running before x11vnc is starter, x11vnc does not start the x server). try -create to start it blabla
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| 07:25 | <alkisg> Yes, you didn't manage to properly access the x server
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| 07:25 | It's tricky; epoptes automates all that
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| 07:25 | <Basnap> You mjust use -display OR set and export $display to refer to the display of the desired X server. Usually display is :0, x11vnc use this by defailt
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| 07:26 | You need sufficient permissions (Xauthority) to connect to the X display
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| 07:26 | <alkisg> Btw I sent you a personal message about profressional support if you're interested
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| 07:26 | <Basnap> You often need to run x11vnc as the user logged into the X sesssion. So make sure to be that user when you type x11vnc
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| 07:28 | "Being root is usually not enough because the incorrect MIT-MAGIC-COOKIE file may be accessed" The cookie file contains the secret key that allows x11vnc to connect to the desired x display.
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| 07:29 | <alkisg> Those are just standard messages that mean your DISPLAY/XAUTHORITY are wrong
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| 07:29 | No need to paste more of them...
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| 07:29 | <Basnap> you can specific the MIT MAGIC COOKIE file with -auth blabla. I figured it seems to be /var/run/ldm-x-something
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| 07:29 | ah k
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| 07:29 | just wanted to provide some info.
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| 07:30 | So you are very sure root is the user executing the login screen as well as active the whole time during the login?
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| 07:30 | <alkisg> Yup
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| 07:31 | The proper way to use a vnc server on the clients would be to run it when ldm runs,on the same context, and provide a way to enable/disable it via lts.conf
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| 07:31 | This work could go upstream in ltsp, and it would take an hour for scripting and one for testing
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| 07:32 | But this would need more resources than epoptes-client needs, as epoptes-client is a shell than can run vnc on demand
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| 07:32 | While in your solution the vnc server would always be running, wasting resources
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| 07:34 | <Basnap> I might try to run epoptes under windows by cygwin
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| 07:34 | Or VM? Maybe. I am not sure yet how to configure epoptes to send data to another server, though.
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| 07:34 | <alkisg> You can run it on the ltsp server, VNC to the ltsp server, and then do a direct VNC connection from windows to the ltsp clients, without the traffic passing from the ltsp server
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| 07:35 | <Basnap> How?
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| 07:35 | <alkisg> That's what I was suggesting half an hour ago ;)
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| 07:36 | This is a custom solution though, I don't have enough time to give free support for custom solutions. This doesn't require any coding.
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| 07:36 | Ping me if you're interested in professional support; or wait in case someone else can help more
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| 07:36 | <Basnap> Ah ok, I thought you were referring only to VNC regarding a custom solution
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| 07:37 | <alkisg> VNC will run on windows, yes
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| 07:37 | <Basnap> And that the thing with epoptes would work already
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| 07:37 | <alkisg> Epoptes would work fine; it's the "access the clients via windows" part that's non standard and needs documentation
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| 07:42 | <Basnap> OK, I'll try to get epoptes running on Cygwin at the same time while trying to get VNC working properly. I'll try to let you know if I can use it with Cygwin, so you might could add it to the "windows client" page I linked before if it does!
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| 07:43 | <alkisg> np
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| 07:53 | <Basnap> There seems to be only an .Xauthority file for the user "test" as I was able to find (literally!) out.
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| 09:00 | <Basinator2> Hi, me again! Got a dc and now on anothewr machine.
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| 09:00 | I wondered and setting it up now.
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| 09:00 | What if I install a VM with a *Ubuntu and try to run epoptes on it, wouldn'
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| 09:01 | 't i be able to connect to epoptes clients of the LTSP server directly?
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| 09:01 | That's at least my current idea. Also: Can an epoptes client have 2 epoptes servers?
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| 09:05 | <alkisg> Ubuntu VM inside windows => sure, as long as you have bridged networking,
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| 09:05 | 2 epoptes servers => nope, not without a bit of hacking
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| 16:55 | <Leandro_> Hello guys. I'm having trouble to boot some thinclients. The client says: "Loading initrd.img-4.15.0-47-generic...ok." and nothing happens after that.
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| 16:56 | The server boots fine on some HP All-in-one, but not booting on HP Thinclient
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| 16:58 | <alkisg> !quiet-splash
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| 16:58 | <ltsp> quiet-splash: to disable the splash screen in Ubuntu, in order to see any boot error messages, run sudo gedit /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default and remove quiet splash plymouth:force-splash vt.handoff=7
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| 16:58 | <alkisg> First, try to remove that; then, try with an older kernel; finally, try with -47 with a local installation (e.g. usb stick, local or external disk...)
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| 17:10 | <Leandro_> ok I'll try that
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| 17:21 | <Leandro_> Pardon my ignorance, but in the default file, should I add plymouth:force-splash vt.handoff=7 at the end of the file? Cause there is no "quiet splash" on it
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| 17:24 | <alkisg> Leandro_: ok then you don't need to try the quiet splash step. Btw, how much ram do those problematic clients have?
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| 17:26 | <alkisg> And, where they booting before, with the previous kernel?
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| 17:29 | <Leandro_> Sorry, dropped connection.
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| 17:29 | They have 1GB of RAM.
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| 17:29 | <alkisg> (08:26:35 PM) alkisg: And, where they booting before, with the previous kernel?
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| 17:29 | <Leandro_> And yes, there were booting. There were already working on an old ubuntu 10.10 LTSP installation
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| 17:30 | <alkisg> No, I mean with 4.15.0-46 or so
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| 17:30 | Is this the first time you try to boot them with ubuntu 18.04?
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| 17:31 | <Leandro_> Yeah, this is the first time
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| 17:31 | <alkisg> Try to boot them with a live usb stick, it may be a kernel issue, not an ltsp issue
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| 17:31 | <Leandro_> alright. Good Idea
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| 17:32 | I'll do that and get back to you
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| 17:32 | thanks for now
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| 17:32 | <alkisg> np
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| 18:21 | <quinox> Talking about that...
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| 18:21 | who renders those "Loading vmlinuz..." and "Loading initrd" messages?
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| 18:23 | I'm a bit triggered by the fact that the vmlinuz message has "-generic...[SPACE]ok" whereas the initrd message has "-generic...[NOSPACE]ok"
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| 18:24 | pxelinux I suppose
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| 18:56 | <quinox> I made a checkout of syslinux, distinctively marked all the loading message and built a new pxelinux.0 -- let's test it out tomorrow
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| 19:33 | <alkisg> quinox: the next ltsp that I'm preparing no longer uses syslinux, only ipxe and grub. Those loading messages come from the boot loader, which is probably syslinux in your case
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