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


Channel log from 18 March 2021   (all times are UTC)

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04:19
<peanutbutterandc>
alkisg, is there any chance that you are around?
04:20
...or anybody else who might be willing to give me a few pointers regarding ltsp image configuration?
04:21
I can't wrap my head around where the users come from. In the clients. For me, the clients could only log in as the pre-existing users in the ltsp server computer.
04:22
and here's another thing: it seems that if two clients log in as the same user, their changes kinda' over-writes each other's (wallpaper changes, nothing serious tested so far)
04:22
I wonder if there is a way to create 5 users (I have 4 client computers set-up), and prevent a user from being logged in twice at the same time.....?
04:23
ltsp is wonderful, BTW. I'll be digging around in the docs and doing some experiments in the meantime then
05:22
<alkisg>
peanutbutterandc: morning, reading...
05:23
LTSP users are server users. Users don't need to exist at all in the vm/image/chroot.
05:25
To limit connections, see https://github.com/ltsp/ltsp/discussions/357
05:34
<peanutbutterandc>
alkisg, Good morning! Thank you for the information. It's very helpful.
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07:22
<peanutbutterandc>
alkisg, hey there... what might be the reason a ltsp client get stuck at 'TFTP.....' while booting (after autoselect uidonly.kpxe)?
07:24
<alkisg>
!undi
07:24
<ltspbot>
I do not know about 'undi', but I do know about these similar topics: 'uefi'
07:25
<alkisg>
!learn undionly.kpxe as Undionly.kpxe fails to work with some NICs. Test if ipxe.pxe works for all your clients instead: sudo wget boot.ipxe.org/ipxe.pxe -O /srv/tftp/ltsp/undionly.kpxe
07:25
<ltspbot>
The operation succeeded.
07:26
<peanutbutterandc>
alkisg, Thank you!
07:26
<alkisg>
np
07:27
<peanutbutterandc>
(also, i think that if I manually `ltsp dnsmasq` again, it works.... it has been working every now and then)
07:27
but i'll check it out.....
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07:54
<peanutbutterandc>
alkisg, update: ipxe.kpxe as undionly doesn't seem to resolve the issue
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07:54
<alkisg>
peanutbutterandc: does this happen to any client at that point, or to just some specific clients?
07:55
<peanutbutterandc>
it's happening to 2 clients w/ the original undionly.kpxe
07:56
let me check w/ the fake one on the other client too
07:56
<alkisg>
peanutbutterandc: were they booting previously? The problem I'm talking about it permanent, undionly.kpxe doesn't work in some NICs; if it worked yesterday, then it's another problem
07:57
Can you upload a screenshot of the client screen?
07:57
<peanutbutterandc>
okay.... it seems to work.... w/ ipxe.kpxe now
07:57
the clients are booting
07:58
i was on another setup yesterday... booting virtual clients w/ virtual ltsp server. but now, w/ a real deployment, things are.... heading south in ways i never thought of before
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15:09
<peanutbutterandc>
alkisg, Hey there.... I think I need your help again. So, I suppose I should explain the deployment. I have 1 laptop that will be the server. And 4 laptops that will be the clients. Connected via a desktop switch. So, given the circumstance, perhaps I should `ltsp dnsmasq` a little different? Or should I use a 'ip address shared w/ other computers' kind of network from network manager? Any pointers, please?
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15:43
<alkisg>
peanutbutterandc: they're connected with the switch, and how do they get internet access? Isn't there a router involved?
15:43
<peanutbutterandc>
alkisg, not at all. It's just a LAN.
15:44
But all laptops have a wireless interface and also an ethernet port.
15:44
I want to connect them all via ethernet. And ignore wireless for the moement
15:44
*moment
15:44
<alkisg>
peanutbutterandc: ok, we ignore wireless, but you're saying they won't go online, right?
15:45
<peanutbutterandc>
I was trying to look at setting up a dhcp server w/ dnsmasq.... but i thought it might conflict w/ what ltsp does
15:45
<alkisg>
There's no browsing involved, no internet, ok?
15:45
<peanutbutterandc>
alkisg, yes, sir!
15:45
<alkisg>
in that case, you need to set a static ip =192.168.67.1 to the ltsp server's nic
15:45
LTSP has already configured dnsmasq to be a dhcp server there
15:45
But you need that specific ip
15:45
<peanutbutterandc>
alkisg, Ah... that is something that I have to do manually!? Reading the man page, I thought `ltsp dnsmasq --proxy-sth=0` would do it for me....
15:46
I see...
15:46
<alkisg>
peanutbutterandc: ltsp doesn't set the server ip
15:46
<peanutbutterandc>
that makes sense
15:46
<alkisg>
It configures dnsmasq, but you need to set the ip in network-manager
15:46
<peanutbutterandc>
it is as easy as doing it graphically in the network manager!?
15:47
may I ask you to please connect to my server for a moment please?
15:47
!vnc
15:47
<ltspbot>
I do not know about 'vnc', but I do know about these similar topics: 'kvm-vnc', 'uvnc-dide', 'vnc-alkisg', 'vnc-dide', 'vnc-edide', 'x11vnc'
15:47
<peanutbutterandc>
!x11vnc
15:47
<ltspbot>
x11vnc: One way to share a graphical screen with a remote person is: [local pc] port forward 5500, run: vncviewer -listen [remote pc] sudo apt-get install x11vnc; x11vnc -noshm -connect <technician-ip>
15:47
<peanutbutterandc>
wait... what was that?
15:48
<alkisg>
This one is the generic one; the others with -alkisg are for me
15:49
!vnc-dide
15:49
<ltspbot>
vnc-dide: To share your screen with me, run this: sudo apt-get --yes install x11vnc; x11vnc -connect srv1-dide.ioa.sch.gr - this is a reverse connection, it doesn't need port forwarding etc.
15:49
<peanutbutterandc>
just a sec please
15:50
I think it's done
15:50
I'm recording the screen this time as this is a real machine and not a virtual one
15:51
<alkisg>
peanutbutterandc: you want your sever to serve over wifi?
15:51
<peanutbutterandc>
alkisg, no sir. over wire. ethernet
15:52
<alkisg>
peanutbutterandc: hmm, vnc is too slow for some reason, one frame per minute
15:52
Can you open the network connection editor?
15:52
<peanutbutterandc>
that sucks....
15:53
certainly
15:53
it was actually right there... network connections
15:54
<alkisg>
peanutbutterandc: can't operate, vnc too slow. Name it 192.168.67.1, give it static ip=192.168.67.1, and activate it
15:54
No gateway or dns needed there
15:54
<peanutbutterandc>
Certainly!
15:54
is it okay if I name it ltsp-link (or sth similarly corny)?
15:54
<alkisg>
Sure
15:55
Plain LTSP, LTSP-no-internet, whatever you like
15:55
I'm still getting one frame per minute; I'll see what you're doing in 30 seconds... :D
15:55
Looks good, now activate it
15:56
<peanutbutterandc>
done
15:56
How do I activate it? o.O
15:56
I sound like an idiot
15:56
<alkisg>
You click on the network icon to the bottom, and select ltsp-link
15:56
You'll need to actually plug the wire to the switch first
15:56
Now it says 'disconnected' because you have no wire
15:56
<peanutbutterandc>
oh certainly
15:56
<alkisg>
Right
15:57
Now click "connection information"
15:57
You should see the ip
15:57
Scroll down the menu, it should be there
15:57
Hmm, it should be under vpn connections, try to wheel down
15:57
Looks good
15:57
Now boot a client
15:58
<peanutbutterandc>
ip a shows that 192.168.67.1/24
15:58
yes sir booting.... perhaps i should `ltsp dnsmasq --proxy-sth=0` just to be sure
15:58
.... i don't remember whether or not i did that right
15:58
--proxy-dhcp=0
15:58
shall i?
15:59
hmmm.... it appears i've done that already
15:59
<alkisg>
no
15:59
<peanutbutterandc>
so okay
15:59
<alkisg>
you don't need proxy=0
15:59
nor real=1
15:59
<peanutbutterandc>
i don't....? so I should perhaps just do a bare `ltsp dnsmasq`?
15:59
<alkisg>
yes
15:59
<peanutbutterandc>
okay
15:59
on it right now
16:00
<alkisg>
Didn't the client boot already?
16:00
The 192.168.67.x/24 subnet is active unless you run ltsp dnsmasq --real-dhcp=0
16:00
<peanutbutterandc>
ummm.....
16:00
it's at pxe
16:00
ooooh
16:00
there it is!
16:00
booting up
16:00
<alkisg>
So it would be active anyway, no matter what you did so far. OK, nice
16:01
<peanutbutterandc>
just a moment please I am actually cheating and only using a local link for the moment... i'll use a switch and boot another one as well
16:01
neato!
16:01
thank you very much
16:01
did i tell you that i kinda' sorta' found a bug-ish thingy today?
16:01
<alkisg>
Trisquel is supposed to be more open-source enforcing than debian?
16:02
What bug?
16:02
<peanutbutterandc>
alkisg, endorsed by papa stallman and the fsf :D
16:02
<alkisg>
Hehe
16:02
Pave the way, we'll follow
16:02
<peanutbutterandc>
so, if a user is a member of the group 'nopasswdlogin'.... if I try to log in, it'll bring me back to the login screen
16:02
happened to me today. and almost made me cry :D
16:03
<alkisg>
That tells your DM that no password is needed, so you need to specify it in ltsp.conf
16:03
Since you didn't, it won't work over sshfs, only over nfs
16:03
It's expected behavior
16:04
<peanutbutterandc>
the default config (with `ltsp nfs` as a command as per the installation guide) is infact sshfs?
16:04
<alkisg>
Hmm, I wonder if simplescreenrecorder was causing vnc to show only one frame per minute...
16:04
<peanutbutterandc>
ah!!!!
16:04
<alkisg>
Yes, nfs is for rootfs, sshfs for home
16:04
<peanutbutterandc>
oooooh
16:05
<alkisg>
!ltsp-nfs
16:05
<ltspbot>
ltsp-nfs: Configure NFS exports for LTSP: https://github.com/ltsp/ltsp/blob/master/docs/ltsp-nfs.8.md
16:05
<peanutbutterandc>
can you use this vnc now?
16:05
<alkisg>
...while in the man page, there's an example on how to set up nfs home, if you want it
16:05
vnc => no, it still sucks
16:05
<peanutbutterandc>
I see....
16:06
<alkisg>
It's probably related to the internet connection between us, and mine is good, 250 mbps :P
16:06
<peanutbutterandc>
Hmmm... so that means that I fix my ltsp.conf and things will work.... and I can have the guarantee that one user will be logged in in only 1 client
16:06
i'll look at that
16:06
<alkisg>
(closed vnc)
16:06
<peanutbutterandc>
yes... my internet connection is to blame. I admit. :D
16:06
oh thanks
16:07
whoa this man page is quite loooong!
16:07
<alkisg>
!forget ltsp-nfs
16:07
<ltspbot>
The operation succeeded.
16:08
<alkisg>
!learn ltsp-nfs as Configure NFS exports for LTSP: https://ltsp.org/man/ltsp.conf/
16:08
<ltspbot>
The operation succeeded.
16:08
<peanutbutterandc>
could you please throw me what I'm supposed to look for? in order to have nopasswdlogin?
16:08
<alkisg>
!forget ltsp-nfs
16:08
<ltspbot>
The operation succeeded.
16:08
<peanutbutterandc>
okay this one.... looking at it then
16:08
<alkisg>
!learn ltsp-nfs as Configure NFS exports for LTSP: https://ltsp.org/man/ltsp-nfs/
16:08
<ltspbot>
The operation succeeded.
16:08
<alkisg>
peanutbutterandc: that last one
16:09
It's a small page, read the examples section
16:10
<peanutbutterandc>
On it right now!
16:10
Thanks!
16:11
wait... but if I export /home over nfs, I don't get to place a system whereby concurrent logins of the same users are prevented, right?
16:11
<alkisg>
peanutbutterandc: this was for nopasswdlogin to work
16:12
It's not related to concurrent logins
16:12
To avoid concurrent logins, see the link that I sent to you yesterday
16:12
<peanutbutterandc>
oh... okay.... um... I'd much rather prevent concurrent logins than have nopasswd logins
16:12
yes, the /etc/security hack
16:12
<alkisg>
Hmm?
16:12
No, it was an ltsp discussions thread
16:12
<peanutbutterandc>
https://github.com/ltsp/ltsp/discussions/357
16:13
echo "@onelogin - maxlogins 1" > /etc/security/limits.d/local.conf
16:13
<alkisg>
Right
16:13
But note that it won't work currently, even though it's the correct path :D
16:13
well, if you do that AND nfs home, it will work
16:13
<peanutbutterandc>
okay... so not worth going that route I suppose.... at the moment then :D
16:14
ooooh..... hmmmmm
16:14
that's interesting
16:14
that means I also get nopasswdlogins
16:14
neat
16:14
<alkisg>
Are you sure you don't want to enable autologin instead?
16:15
pc1 would login as user1 automatically, etc
16:15
<peanutbutterandc>
alkisg, oooh how do i do that!?
16:15
<alkisg>
man pages!
16:15
To the rescue!
16:15
<peanutbutterandc>
oh okay. which one please!?
16:15
there are so many!!!
16:15
<alkisg>
!ltsp.conf
16:15
<ltspbot>
ltsp.conf: Configuration file for LTSP: https://ltsp.org/man/ltsp.conf/
16:15
<peanutbutterandc>
oh okay! thanks!
16:16
<alkisg>
So people complain that I write too little, some that I write too much. Can't please them all! :D
16:16
*some
16:16
<peanutbutterandc>
alkisg, I'll try not to write a blog about ltsp someday. (once I start blogging someday) - and instead try to contribute to the wiki :P
16:20
well, alkisg, thank you very much once again for helping me out. I hope you have a great day! We shall certainly meet in irc again (when i inevitably bump my head into another wall) Thank you for your guidance and patience.
16:21
<alkisg>
np
16:21
<peanutbutterandc>
(:
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16:37
<antares2021>
Good afternoon. I have two issues to comment, working with raspios in a ltsp ubuntu 20 installation. First, all updates/install of the raspios software (packages, etc) MUST be done with the NFS_RW condition enabled? I realized that after switching to LTSP mode netbooting, all the LTSP servers were available for login, and with the main server user
16:37
you can even install software, etc... but maybe you install it on the server, not in raspios? Because I left a lot of things working that I am not able to found now
16:39
Among those things, several installed programs but also I miss the ability to print to a labelprinter through USB. It turns out that I get a 'permission denied' when accessing /dev/ttyAMA0 when one week ago I was able to do print and get the applications running. Some of them it even doesn't find the file of the command!!
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16:39
<alkisg>
antares2021: the easiest way is to have an administrative rpi, like it says in the documentation
16:40
And you can toggle administrative / non-administrative, from a line in /srv/ltsp/raspios/etc/ltsp/ltsp.conf
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16:41
<alkisg>
About /dev/tty*, run `ls -l /dev/tty*` and see the group; possibly dialout; the user needs to be in that group to access that device
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16:42
<antares2021>
alksig: I guess administrative pi is when you boot it with NFS_RW mode?? Sorry, I am not aware of that administrative rpi in the docs. And also: the permissions shold be given to the users (all the future raspberry pi users) in the server, isn't it?
16:42
<peanutbutterandc>
alkisg, ....and I'm back. I rebooted the server.... and now I'm geting a PXE-E32: TFTP open timeout. Any ideas please?
16:44
this is quite strange. it's that same client that was booting just flawlessly just a reboot ago
16:48
.....and restarting dnsmasq fixed it....
16:48
curioser and curioser....
16:48
let me poke around a bit. This is interesting
16:54
<antares2021>
alksig: Ok, I've found some info in the IRC logs from march 3, 2020... I'll try to follow that
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16:59
<peanutbutterandc>
yeah.... the clients are stuck at TFTP..... PXE-E32: TFTP open timeout about each reboot of the server
17:04
<antares2021>
alksig: I wonder if you will appreciate if I try to convert this issue into a page for the wiki
17:06
<alkisg>
antares2021: permissions on the server, yes
17:06
antares2021: eeeh personally I've no need for wiki pages, but I do write them for you guys
17:07
<peanutbutterandc>
^ :D
17:07
Thanks for the wiki :D
17:07
<alkisg>
The best idea is for people to maintain their own ltsp wiki pages, as notes, so that they are useful to THEM, and so that others may also benefit
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17:08
<peanutbutterandc>
so... like blogs? :D
17:09
<alkisg>
peanutbutterandc: no, in the ltsp wiki, https://github.com/ltsp/ltsp/wiki
17:09
Blogs are not gathered in one place
17:09
So it's hard to search them for info
17:10
<peanutbutterandc>
yeah... I was trying to refer to your admonition to not write blogs at the very start of the wiki :D
17:10
Anyways, any idea why my ltsp server stops working on reboot (as in clients get stuck at PXE-E32: TFTP open timeout). But if I `systemctl restart dnsmasq`, the clients start booting again
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17:11
<peanutbutterandc>
I can't have this happen on me at the school (for which I'm sorta' volunteering)... the kids looked at me today with so much disappointment in their eyes.
17:12
<antares2021>
alksig: yes, I meant ME to write one of those pages of ltsp wiki (just for saving your time of doing that), as you say at the very first page of the wiki. Guess some nice markdown will do the trick
17:17
<peanutbutterandc>
antares2021, might you have some ideas regarding why my clients get stuck at tftp..... after my server reboots?
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17:27
<antares2021>
peanutbutterandc: I have no clue. I've reading the irc log before I logged in today and saw your issue... and sounds like Martian to me. Sorry :(
17:28
<peanutbutterandc>
antares2021, I see. It's all right. Thank you anways (:
17:33
<alkisg>
(07:10:47 PM) peanutbutterandc: Anyways, any idea why my ltsp server stops working on reboot ==> grep -r bind-interfaces /etc/dnsmasq.d
17:33
Remove that, it's a bug in libvirt+dnsmasq
17:33
<antares2021>
peanutbutterandc: However, I had some issues with dnsmasq when port 53 was used by another service, so dnsmasq couldn't start. Maybe you have a similar issue there, something that at some point makes dnsmasq not function properly... imagine a service/whatever that starts before dnsmasq, prevents dnsmasq from starting and the service itself stops
17:33
after system startup...
17:34
too late XDDD
17:34
<alkisg>
antares2021: yes I understood, it's nice if people volunteer to contribute, I was just noting that wiki pages aren't useful to me, but to other users
17:41
<peanutbutterandc>
alkisg, Awesome! It works now. Thank you very much!
17:42
antares2021, Yes, that, too, was troubling me. But that has been resolved on my machine by now. Thanks for the ip, nevertheless
17:42
*tip
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20:13
<flaep>
Hi, just a quick question. Is ltsp nfs only and no longer supports nbd?
20:14
<alkisg>
Hi flaep, it's very easy to use nbd with the new ltsp, but it's not automated
20:14
I started adding support for it, but nfs was so much more stable that I removed it
20:14
nbd currently has a lot of drawbacks, and the only benefit is that it also supports block devices instead of files
20:15
<flaep>
alkisg thank you for your answer.
20:15
<alkisg>
Configuring /etc/nbd-server/conf.d and customizing ltsp.ipxe for nbd, should take less than 5 minutes
20:15
No other tasks should be necessary
20:15
<flaep>
I was a bit confused since its still mentioned a was the default with5
20:16
ok will do
20:16
<alkisg>
Indeed it was, in ubuntu
20:16
flaep: why do you want nbd?
20:16
(debian was still using nfs as the default if I recall properly)
20:17
<flaep>
iam currently working at project that still uses ltsp5 and we want to upgrade of cause
20:17
<alkisg>
But why you don't want to switch to nfs? You can use ltsp5 and ltsp21 at the same time with no issues, even if one is nbd and the other is nfs
20:18
<flaep>
iam switching back and forth between ltsp and ltsp5 documentation
20:18
I never said i dont want to switch ^^.
20:18
<alkisg>
Btw, ltsp21 should be able to boot an ltsp5 image without even running ltsp image at all
20:19
<flaep>
Just wanted to make sure I am not missing anything
20:19
<alkisg>
Wait
20:19
You have ltsp21, and you want to boot an ltsp5 image using nbd, and you don't know how to configure nbd now?
20:19
In that case, you can just run the old ltsp-config nbd command
20:20
<flaep>
cool.
20:20
<alkisg>
:ltsp5
20:20
set img x86_32
20:20
set cmdline ro root=/dev/nbd0p1 nbdroot=${srv}:/opt/ltsp/i386 init=/sbin/init-ltsp forcepae
20:20
kernel /ltsp/${img}/vmlinuz initrd=ltsp.img initrd=initrd.img ${cmdline}
20:20
initrd /ltsp/${img}/initrd.img
20:20
boot || goto failed
20:20
And that's my ltsp5 entry for ltsp.ipxe; yours would use nbd0 instead of nbd0p1 there
20:21
So that you can select "ltsp5" from the blue ipxe menu...
20:22
<flaep>
thank you
20:22
<alkisg>
np
20:23
<flaep>
have a nice day/evening what ever ^^
20:23
<alkisg>
To you too
20:24
<flaep>
bye
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