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


Channel log from 28 January 2021   (all times are UTC)

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01:50
<applemuncy_1>
tftp back up and running. I must have offended dnsmasq.
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03:09
<mwalters>
please try to be kind to dnsmasq
03:09
:)
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14:21
<ltspnewbie>
Hi. I am using LTSP with NFS $HOME instead of SSHFS. Is there a way to disable the 'pamltsp' module checking for every auth and throwing an error that sshfs could not mount $HOME?
14:24lucascastro has joined IRC (lucascastro!~lucascast@189.90.44.253.jupiter.com.br)
14:26
<alkisg>
ltspnewbie: when using NFS home, pamltsp then doesn't try to mount home over sshfs
14:26
Can you pastebin your ltsp.conf?
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14:28
<ltspnewbie>
sorry... that was stupid: https://pastebin.com/VDeyrFLm
14:29
It actually mounts the homes successfully but for some reason pamltsp still thinks the client uses sshfs
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14:37
<alkisg>
ltspnewbie: mind if I see over vnc?
14:38
!vnc-dide
14:38
<ltspbot>
vnc-dide: To share your screen with me, run this: sudo apt-get --yes install x11vnc; x11vnc -connect srv1-dide.ioa.sch.gr - this is a reverse connection, it doesn't need port forwarding etc.
14:38
<alkisg>
Note that your IMAGE_TO_RAM=1 is under [crt_monitor], so it's not applied
14:40
This is the autodetection check: if [ "$SSHFS" = 0 ] || ! command -v sshfs >/dev/null || mountpoint -q /home || mountpoint -q "$pw_dir"
14:40
<ltspnewbie>
vnc is not easily doable i am afraid i am behind a proxy
14:40
<alkisg>
So, I want to run `mountpoint -q /home` right before login on a client, and see why it's not true, if you're actually mounting home over nfs
14:41
OK, do that ^ then
14:41
Reboot a client, don't login, and run `mountpoint /home` via epoptes
14:44
<ltspnewbie>
I am on a headless server setup and did not use epoptes until now. I am going to have a look at that autodetection check
14:45
<alkisg>
!root
14:45
<ltspbot>
I do not know about 'root', but I do know about these similar topics: 'ROOT_PASSWORD_HASH', 'chroot'
14:46
<ltspnewbie>
I was wondering if I could disable this check via OMIT_FUNCTIONS in ltsp.conf
14:46
but this could be something else, no?
14:46
<alkisg>
ltspnewbie: you have something wrong, and you want to add another wrong instead of fixing it?
14:46
E.g. maybe this will reveal that you're not actually using nfs
14:46
And that you're using tmpfs, and things get lost on reboot
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14:47
<alkisg>
You can enable a root hash to be able to login as root on the clients
14:47
And run the check from there
14:47
<ltspnewbie>
I saw that
14:47
<alkisg>
See `man ltsp.conf`, last paragraph
14:47
<ltspnewbie>
That maybe the best...
14:48
<alkisg>
But remember to not login as a user before. To have a freshly rebooted client when you run `mountpoint /home`.
14:55
<ltspnewbie>
It doesnt apply that root password hash. I ran `ltsp initrd` after changing ltsp.conf - do I have to do something else to let it take effect?
14:56
nvm i probably took the wrong one...
15:05
ok i can login as root
15:16
I am sshing on the client. What exactly do you want me to check now?
15:16
<alkisg>
(04:40:51 PM) alkisg: So, I want to run `mountpoint /home` right before login on a client, and see why it's not true, if you're actually mounting home over nfs
15:16
<ltspnewbie>
root@pc7010-48:~# mountpoint /home
15:16
<alkisg>
No output?
15:17
<ltspnewbie>
`/home is a mountpoint`
15:17
the other user is actually from ldap
15:18
`skombrink@pc7010-48.zkrd-h10.de's password:
15:18
.Pamltsp failed to mount home via SSHFS: .
15:18
Welcome to Ubuntu 20.04 LTS (GNU/Linux 5.4.0-26-generic x86_64)
15:18
`
15:18
<alkisg>
What command did you run to see these messages?
15:19
<ltspnewbie>
`ssh skombrink@pc7010-48`
15:19
remote login with ldap user
15:19
<alkisg>
By remote login, do you mean ssh TO the client or FROM the client ?
15:19
<ltspnewbie>
it works but it hangs a while and dumps this error msg from pamltsp
15:19
i am sshing into the booted ltsp client
15:20
from my local machine
15:20
<alkisg>
OK please dont do that
15:20
<ltspnewbie>
ltspserver is a vm
15:20
<alkisg>
We want to test if normal things work
15:20
<ltspnewbie>
it is the same if i login at the pc client
15:21
the graphical login fails it just logs me in when i use the terminal
15:24
<alkisg>
OK, if you want to test properly, log in as root on the client using the hash ltsp.conf method, then run `mountpoint /home`, with no users logged in
15:24
The rest are too complex to troubleshoot over IRC, e.g. it took an hour to realize you're ssh'ing into the client...
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15:29
<ltspnewbie>
I wasn't sshing in the beginning. I just did because I had to walk to the client all the time and the behavior seemed identical no matter if I connect remotely or locally
15:30
going to reboot and login locally
15:32eu^host-091-097- is now known as jorigel
15:32
<alkisg>
jorigel: nice
15:33
Now please run this: x11vnc -connect alkisg.ltsp.org
15:35
<jorigel>
thats what I did got:
15:35
aborting LTSP, while booting client on debian server
15:36
<alkisg>
jorigel: ok, I know the issue, now I want you to share your screen with me so that we troubleshoot this faster,
15:36
<jorigel>
caught X11 error:
15:36
28/01/2021 16:33:59 deleted 1 tile_row polling images.
15:36
X Error of failed request:  BadRequest (invalid request code or no such operation)
15:36
  Major opcode of failed request:  130 (MIT-SHM)
15:36
  Minor opcode of failed request:  1 (X_ShmAttach)
15:36
  Serial number of failed request:  52
15:36
  Current serial number in output stream:  55
15:36
<alkisg>
is your server headless?
15:36
<jorigel>
yes
15:36
<alkisg>
Do not paste more than 2-3 lines in IRC as then freenode will kick/ban you
15:36
<jorigel>
ok
15:37
<alkisg>
jorigel: run this: /usr/share/epoptes-client/share-terminal 81.186.20.0
15:37
On the server
15:37
<ltspnewbie>
alkisg: output is again `/home is a mountpoint`
15:37
<alkisg>
ltspnewbie: then LTSP wouldn't use SSHFS, as you see from the code
15:42
<ltspnewbie>
if I grep for that line it doesnt find it. where did you paste it from?
15:44
ok I found it.
15:50
i've got an idea why it might happen... ldap might return a different home dir
15:55
<alkisg>
ltspnewbie: yeah that would take ages to guess over IRC that's why I gave up
15:55
jorigel: the problem is that ltsp ipxe is incompatible with bash,
15:55
while usually /bin/sh points to /bin/dash, not /bin/bash
15:55
So you need two things: (1) please file a bug report that `ltsp ipxe` doesn't work properly with bash,
15:56
and (2) symlink /bin/sh to /bin/dash as it normally is; why did you select bash there?
15:56
As a workaround, I put #!/bin/dash at the top of /usr/sbin/ltsp, so it works now
15:57
<jorigel>
ok, I have to analyse this
15:57
<alkisg>
Why did you put bash in /bin/sh?
15:58
<jorigel>
I dont see that I did that . . .
15:58
I will have a look
15:58
<alkisg>
ls -l /bin/sh
15:58
lrwxrwxrwx 1 root root 4 Nov 14 2019 /bin/sh -> dash
15:58
Normally it points to dash
15:58
But you modified it to point to bash
15:58
This isn't normal for debian-based systems
16:00
<jorigel>
maybe a program installation did that?
16:01
<alkisg>
It would have to be a program outside of debian
16:01
<jorigel>
I don't remember ever changing a symlink in there . . .
16:01
<alkisg>
I believe it would violate debian policy if a debian package did that
16:01
OK, do you want me to put it back?
16:01
It might cause more problems for you, unrelated to ltsp
16:01
<jorigel>
yes, pls.
16:02
<alkisg>
jorigel: all OK now
16:03
<jorigel>
thanks a lot. I will try to have a look, what was going on there. . .
16:04
<alkisg>
I reported the ltsp bug there: https://github.com/ltsp/ltsp/issues/389
16:05
<ltspnewbie>
alkisg: thanks... ldap is a different issue... unfortunately not all users have the same home dir. I'll have to see what to do there.
16:05
<alkisg>
OK
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