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


Channel log from 12 August 2019   (all times are UTC)

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09:55
<pavars__>
Hi, just tested now and found what was the issue for getting -bash -fork: resource temporarily unavailable
09:55
I raised both of these limits to 20k and 25k
09:55
Additional information for modern (systemd) linux systems.
09:55
There are many resources about this of values that may need tweaking (the other answer is a good source for most of them); however a new limit is imposed by way of the systemd "TasksMax" limit which sets pids.max on the cgroup.
09:55
For login sessions the UserTasksMax default is 33% of the kernel limit pids_max (usually 12,288) and can be override in /etc/systemd/logind.conf.
09:55
For services the DefaultTasksMax default is 15% of the kernel limit pids_max (usually 4,915). You can override it for the service by setting TasksMax in "systemctl edit" or update DefaultTasksMax in /etc/systemd/system.conf
09:56
before that the thread count didn't go above ~5k
09:56
# ps -elfT | wc -l
09:56
5286
09:56
now it goes to 15k
09:57
<alkisg>
Are you the one that had issues logging in more than 10 thin client users or so, and this solves it?
09:57
<pavars__>
no issues with 21 user thus far, only application issues
09:57
@alkisg yes
09:57
<alkisg>
Great; ltsp19 doesn't support thin clients, but ltsp5 users might find that useful
09:57
It might also apply for ltsp19 + x2go or xrdp users
09:57
<pavars__>
because everything is running under ssh.service and it hits the limit at some point but it's not logged anywhere
09:58
what's the plan for ltsp19 and when is it coming out?
09:59
<alkisg>
I have the first .deb package ready; it's in alpha; I guess I'll call it "releasable" by the end of the month...
09:59
<pavars__>
we will be upgrading to fujitsu s720 do you think they could handle "FAT" client?
09:59
<alkisg>
I think you said you tried them as fat and they were slow?
09:59
<pavars__>
we tried with s550
10:00
<alkisg>
Acceptable browsing is around 1000 cpu score in cpubenchmark.ne
10:00
*net
10:00
<pavars__>
s720 is newer model https://www.fujitsu.com/fts/products/computing/pc/thin-clients/FUTRO-S720/
10:00
<alkisg>
So check the exact cpu model there, and tell us the score
10:00
E.g. my laptop has 12447 score: https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i7-8750H+%40+2.20GHz&id=3237
10:01
so it's around 50 times faster than your old clients :P
10:01
<pavars__>
AMD G-Series GX-222GC has 1255
10:01
<alkisg>
1255 is acceptable browsing
10:01
Definitively should be fat, not thin
10:02
*definitely
10:03
<pavars__>
I have the same cpu for my laptop :p
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12:01
<pavars>
will ltsp19 be majorly different from ltsp5 ?
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12:08
<alkisg>
!migration
12:08
<ltsp>
migration: https://github.com/ltsp/ltsp/wiki/migration may help LTSP5 users get oriented in the new LTSP concepts
12:08
<alkisg>
pavars: read that one ^
12:08
<pavars>
:)
12:08
<alkisg>
(and tell me if it needs fixes/clarifications)
12:10
Btw, the first build is ready, for advanced users that have a VM or a spare server to test ltsp19 in...
12:10
!installation
12:10
<ltsp>
Error: "installation" is not a valid command.
12:10
<alkisg>
!install
12:10
<ltsp>
install: To install LTSP19+: https://github.com/ltsp/ltsp/wiki/installation. To install LTSP5: http://wiki.ltsp.org/wiki/Installation/Ubuntu for Ubuntu, or http://wiki.ltsp.org/wiki/Installation for other distributions
12:11
<alkisg>
!learn installation as To install the new LTSP, start there: https://github.com/ltsp/ltsp/wiki/installation
12:11
<ltsp>
The operation succeeded.
12:11
<pavars>
I'm not sure if I understand completely "But you can still netboot clients up to the login screen, and then set up a session that uses xfreerdp, x2go or vnc to access the server in a manner similar to thin clients." does it mean that the thinclients will need an OS to be able to connect to ltsp or is it still network boot?
12:11
<alkisg>
It is still network boot
12:11
<pavars>
so xrdp/ x2go are optional
12:11
<alkisg>
But the "remote desktop" part is now handled by x2go/xfreerdp etc, not by ltsp
12:12
x2go/xrdp are what will create a "thin session" instead of the default "fat session" of ltsp19+
12:12
<pavars>
ohh, so fat clients won't need x2go/ xrdp
12:12
<alkisg>
Right
12:12
<pavars>
all clear
12:12
<alkisg>
Ouch, I guess I wasn't very clear in the wiki :D
12:13
<pavars>
¯\_(ツ)_/¯
12:15
ok, but with the user limit issue resolved there are still two annoying issues - 1) sometimes the clients boot up to a black screen and takes several reboots until it shows ubuntu login screen
12:15
<alkisg>
Do you have epoptes installed?
12:16
<pavars>
2) sometimes for some users it shows Ubuntu is updating (or something) system will reboot in 10, 9 ...
12:16
and they need to click cancel
12:16
yes, epoptes is installed
12:16
<alkisg>
!checkupdate
12:16
<ltsp>
I do not know about 'checkupdate', but I do know about these similar topics: 'nbd-checkupdate'
12:16
<alkisg>
!nbd-checkupdate
12:16
<ltsp>
nbd-checkupdate: To avoid bug https://github.com/NetworkBlockDevice/nbd/issues/59, put this in lts.conf: INIT_COMMAND_RM_NBD_CHECKUPDATE="rm -rf /usr/share/ldm/rc.d/I01-nbd-checkupdate"
12:16
<alkisg>
You can solve (2) with that ^
12:16
About (1), when it happens, ping me to see it via epoptes
12:17
<pavars>
we have stopped the user testing for now, as this server will be shipped to a different location
12:17
I will try to get the black screen in the evening
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15:18
<alkisg>
!ppa
15:18
<ltsp>
ppa: https://github.com/ltsp/ltsp/wiki/ppa describes how Debian and Ubuntu users may add the upstream LTSP PPA to their sources, to be able to install LTSP
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