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


Channel log from 9 June 2017   (all times are UTC)

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07:46
<alkisg>
ZAJDAN: I've seen an issue with epoptes and screen locking in a recent ubuntu installation. It was on a thin client (not fat), and the cause was that the RAM was completely exhausted
07:47
The RAM was exhausted because the "apt-daily" service ran `apt-get update` automatically, making /cow on the client waste 300 MB RAM
07:47
Check if that's what's causing the issue in your installation too. If it's out of RAM, then you'll also have other issues...
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08:03
<exebat>
Hi all
08:03
I have a problem with 2 of 30 clients
08:05
I installed realtek-firmware, updated the image, replaced the LAN cable, replaced the whole client - brand new PC and it still stalls
08:05
after some time icons are replaced with blank icons
08:06
and user has to restart the PC
08:06
Does anyone have any suggestion ?
08:07
it started happening 2 weeks ago just like that - it worked without problems for 2 years
08:09
OS is Debian Jessie
08:10
<vlt>
It worked without problems for 2 years on that brand new PC? o_O
08:11
<exebat>
no, on the old one
08:11
I tried everything I could think of on the old PC and then replaced the PC but the problem continues
08:12
and I have 2 clients with the same problem out of 30 computers
08:13
<vlt>
The old and the new one are the two clients?
08:13
<alkisg>
Try putting the client into another work place, so as to test the whole network infrastructure. E.g. cables inside walls etc
08:13
My english there sucked, I hope you got what I meant
08:14
So if e.g. pc2 works and pc6 fails, swap them
08:14
<exebat>
no - 2 old computers with problem replaced with 2 new ones and still producing same error
08:14
<alkisg>
If then pc2 starts to fail, you'll know that the problem is with the networking infrastructure
08:14
<exebat>
I also think that
08:15
<alkisg>
E.g. you might need to review your network sockets, push the cables there in the joints etc
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09:25
<ZAJDAN>
alkisg: now I read Your information about the locking problem because of the exhausted RAM....so I could have a chance :_)
09:27
<alkisg>
ZAJDAN: do you have your setup available currently? I have a few minutes free, I could take a look...
09:28
<ZAJDAN>
alkisg: ok..I will connect the machine
09:29
alkisg: could you sent me vnc connection info please
09:29
<alkisg>
!vnc-dide
09:29
<ltsp>
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.
09:30
<alkisg>
ZAJDAN: boot a client
09:31
<ZAJDAN>
ok
09:32
is there
09:34
alkisg:when you lock the client and will wait 10/20 secundes..it makes the proble..unlock immediately after lock works good
09:35
and it is here
09:38
<alkisg>
ZAJDAN: moment... brb...
09:38
<ZAJDAN>
alkisg: np
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10:07
<alkisg>
http://paste.debian.net/970741/
10:08
It seems like a xprop bug, instead of reading the property it deletes it!!
10:08
Let me check more...
10:08
<ZAJDAN>
np
10:12
<alkisg>
x11-utils 7.7+2
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10:21
<alkisg>
ZAJDAN: as far as I can tell, this is a bug in x11-utils, not in epoptes
10:22
For some reason, `xprop -root EPOPTES_LOCK_SCREEN_PID` deletes the property instead of reading it
10:22
I don't have more time now to try to fix the problem in x11-utils; but it's easy to put a work around there
10:24
<ZAJDAN>
I can let the session opened in the computer where you are connected now, if you will want to look later
10:25
<alkisg>
Nah I'll go away for too long, not worth to wait
10:25* alkisg waves, later...
10:26
<ZAJDAN>
ok...if you will find solution, just say and I will give you the machine to try it
10:27
may I disconnect from VNC?
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15:27
<BuddyButterfly>
hi
15:28
I have tested to connect to fat ltsp clients via xrdp.
15:28
directly.
15:28
xrdp runs correctly and connection is also fine.
15:28
though, login always fails. any idea how to get this to work?
15:30
connection log says
15:30
sending login info to session manager, please wait....
15:30
xrdp_mm_process_login_response: login failed.
15:31
I guess it has something to do with the ltsp session manager....
15:37
<alkisg>
You want to connect to a fat client, and not to the ltsp server?
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15:38
<alkisg>
Fat clients don't have users and you can't authenticate to login there
15:38
While a user is logged in to an ltsp fat client, you could login if you set this:
15:38
!LDM_HASH_PASSWORD
15:38
<ltsp>
Error: "LDM_HASH_PASSWORD" is not a valid command.
15:38
<alkisg>
!LDM_PASSWORD_HASH
15:38
<ltsp>
LDM_PASSWORD_HASH: LDM_PASSWORD_HASH=True in lts.conf saves the password hash to /etc/shadow on login, so that the users can unlock the screensaver etc. If they happen to change their password though, that only takes effect until logout.
15:40
<BuddyButterfly>
alkisg: ltsp: I have in one client LDM_PASSWORD_HASH=yes, is this OK?
15:40
will try with my test client.
15:41
<alkisg>
Try to press alt+ctrl+f1 to that client, and login.
15:41
But first login to ldm; otherwise no users would exist
15:41
<BuddyButterfly>
and yeah, this was my pitfall in thinking. On the client there are no users....
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15:42
<BuddyButterfly>
will try....
15:45
wow, cool, works.
15:45
if I log in with ldm I am able to also connect via xrdp to fat client.
15:46
all that is done is to copy shadow to client upon login?
15:49
then I guess there is some autologin function?
15:49
which I can configure in lts.conf. Just a specific user....
15:53
got it.....
15:53
LDM_USERNAME = user1 LDM_PASSWORD = password1
16:04
<alkisg>
You can also put an RCFILE command to create a specific user
16:04
!password
16:04
<ltsp>
I do not know about 'password', but I do know about these similar topics: 'ROOT_PASSWORD_HASH', 'LDM_PASSWORD_HASH'
16:04
<alkisg>
!ROOT_PASSWORD_HASH
16:04
<ltsp>
ROOT_PASSWORD_HASH: to be able to login as root in vt1, with password "qwer1234", put this in lts.conf: INIT_COMMAND_01="sed 's!^root:[^:]*:!root:$6$p2LdWE6j$PDd1TUzGvvIkj9SE8wbw1gA/MD66tHHlStqi1.qyv860oK47UnKcafSKqGp7cbgZUPlgyPv6giCVyCSCdJt1b0:!' -i /etc/shadow"
16:05
<BuddyButterfly>
guys, many tnx. works perfect!
16:05
<alkisg>
Not that one specifically; you'd use "useradd" instead
16:05
np
16:05
<BuddyButterfly>
auto logs in with username and pw and I can now connect with any rdp client to the fat clients.....
16:05
<alkisg>
With a "local user", you wouldn't need to autologin
16:06
But whatever works best for you, depending on your needs
16:06
<BuddyButterfly>
alkisg: ah, even better. how to achieve?
16:06
<alkisg>
You wouldn't have local /home/username though
16:06
See my instructions above ^
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16:06
<BuddyButterfly>
alkisg: will have a look. scrolled too fast ;-)
16:08
alkisg: you mean ltsp's doc?
16:08
<alkisg>
ltsp is the bot that keeps notes, yes
16:08
So I told it to write you a note that I kept earlier
16:09
<BuddyButterfly>
ahhhh
16:10
was not aware that it is a bot ;-)
16:10
tnx for clarification.
16:10
lol
16:11
alkisg: I tried to copy complete shadow over in init command.
16:11
isn't that possible?
16:12
<alkisg>
man useradd
16:14
<BuddyButterfly>
alkisg: ah, you mean creating a complete new user locally with useradd in init command?
16:14
I think I got it now.
16:15
<alkisg>
Yes
16:16
<BuddyButterfly>
and it would (if I state to create a home) create a home dir under /home that would also vanish upon restart?
16:17
<alkisg>
Yes
16:58
<BuddyButterfly>
alkisg: somehow it does not work with local user. or useradd is not correctly working.
17:00
alkisg: will init command be executed as root?
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17:13
<epoptes_user2>
Hi
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17:13
<vportaqt>
HI guys!
17:20
<alkisg>
BuddyButterfly: yes, init commands run as root
17:20
Check your quoting, if you have $ anywhere you need to escape it
17:20
Hi vportaqt
17:22
<vportaqt>
Can there be two epoptes servers connected to a single client?
17:24
<alkisg>
It's the opposite. Epoptes clients connect to servers.
17:24
You can have one epoptes client running per user, but it's usual to have them connect to different servers
17:26
<BuddyButterfly>
alkisg: yep, had $ in it. trying with escaped $....
17:31
alkisg: works! tnx a lot.
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17:36
<BuddyButterfly>
alkisg: last question. is it possible to reference a bash script in init command. such as not to have tens of init commands?
17:49
<alkisg>
Of course, but you need to include it into the image
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