LTSP 5 is in minimal maintenance mode
The new LTSP is hosted at https://ltsp.github.io

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


Channel log from 15 November 2019   (all times are UTC)

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07:21
<alkisg>
!why-are-irclogs-down?
07:21
<ltsp`>
Error: "why-are-irclogs-down?" is not a valid command.
07:28
<alkisg>
Hrm, increasing MaxClients in the old server's apache configuration fixed it, not sure why that was needed after 10 years... :D
07:40
Oh. It might have been the reason it was hanging so often all these years...
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10:09
<quinox>
we've replaced Apache with nginx on all of our servers, it's much better at dealing with connections
10:10
(if it works it works, just fyi)
10:11
<alkisg>
Hmm I was thinking that apache would be most compatible with e.g. the certbot-autoreniew.deb package etc... but I guess nginx is now famous enough to be supported by everything that i'll probably need...
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10:27
<alkisg>
!ltsp
10:27
<ltsp`>
ltsp: LTSP is the Linux Terminal Server Project, the open source thin/fat client solution. You can find it at https://ltsp.github.io
10:27
<ltspbot>
ltsp: LTSP is the Linux Terminal Server Project, the open source thin/fat client solution. You can find it at https://ltsp.github.io
10:28
<alkisg>
Double bot :D
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11:02
<alkisg>
!irclogs
11:02
<ltsp`>
irclogs: This channel is logged, archives are available at http://irclogs.ltsp.org
11:02
<ltspbot>
irclogs: This channel is logged, archives are available at http://irclogs.ltsp.org
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14:50
<quinox>
I proxy letsencrypt requests from nginx to certbot, this way I don't have shut the webserver down while upgrading the cert
14:53
there's probably a nice integration solution for that nowadays
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15:01
<enoch112>
hi
15:01
it's me again :)
15:01
<quinox>
hi
15:02
<enoch112>
so I've grabbed some logs from dmesg and it's possible to reproduce the issue with random screen blanking when using VGA and DP.
15:02
Here are the dmesg: https://cloud.danielhansson.nu/s/C9qnaLjdPio4MPP
15:02
I've also found how to reproduce it
15:02
question is now, how to solve it?
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15:04
<quinox>
have you checked out google results?
15:04
<enoch112>
yeah, for like 2 hours now
15:04* enoch112 looking for the bug
15:05
<enoch112>
this describes it quite well: https://bugs.launchpad.net/ubuntu/+bug/1574617
15:07
<quinox>
most pages I find don't offer much of a solution
15:07
<enoch112>
to even show the DP screen it has to be forced in ltsp.conf
15:07
exactly, so I came here, waiting for alkisg to be available
15:08
he helped me before :)
15:08* alkisg looksaround
15:08
<quinox>
there's https://bbs.archlinux.org/viewtopic.php?id=198157 with something concrete to try out, but it's from 2015 so who knows if it still works
15:09
<alkisg>
enoch112: since you have 200 such clients, I think the best way is to file a bug upstream in freedesktop.org and provide feedback etc, until ALL the issues are resolved
15:10
Or, check if dp to hdmi adapters or cables solve all issues, and buy 200 of those
15:10
<enoch112>
alkisg yeah, will try to replace the cables
15:10
<alkisg>
(or at least as many dual screen clients you have)
15:10
<enoch112>
but at least I can reproduce it now :D
15:11
<alkisg>
How?
15:12
<enoch112>
move the cursor between the screens, and type at the same time on the DP screen
15:12
in a terminal
15:12
it triggers it almost instantly
15:13
<alkisg>
Sounds great for providing feedback in a bug report;)
15:13
<enoch112>
hehe
15:13
<alkisg>
Intel is especially active at the freedesktop bug tracker
15:14
Is it reproducible with a single dp screen?
15:17
<enoch112>
didn't try yet
15:18
ok, so I put that page in a tab
15:18
will report next week
15:18
anyway.. another thing
15:18
as we kind of went live with this setup we have around 15 users right now using it
15:19
i've noticed that there's a "limit"
15:19
like if user 16 connects, it takes foreeeeeever to netboot
15:19
I noticed that epotes crashed due to lack of RAM and it strarted happening after that
15:19
my question is:
15:19
how much RAM do I need per client?
15:20
I will increase it later tonight and I could set it to whatever
15:20
we have 4 GB now
15:21
does epotes require something like 100 MB per client or something?
15:21
+ overhead for other stuff
15:21
so maybe 200 MB?
15:21
<quinox>
!server-ram
15:21
<ltsp`>
server-ram: LTSP server RAM *really* depends on the usage. But anyway here's an approximation: Server RAM in MB = 1500 + 30*number-of-fat-clients + 300*number-of-thin-clients
15:21
<ltspbot>
server-ram: LTSP server RAM *really* depends on the usage. But anyway here's an approximation: Server RAM in MB = 1500 + 30*number-of-fat-clients + 300*number-of-thin-clients
15:23
<enoch112>
OK, will raise to 16GB and see if it makes any difference
15:23
thanks!
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15:36
<alkisg>
4 GB should be enough if you only have fat clients
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15:40
<alkisg>
There *might* be a memory leak in epoptes 1.0; try restarting it if you see that it's wasting a lot of memory, and see if it's ok after that
15:43
<mwalters>
if you're using chrome/gsuite... 8gb seems to be the sweet spot these days. I find I can get 2*4gb ddr for around $40 these days in the states.
15:45
<alkisg>
I think he's talking about the server, with just fat clients
15:45
No browser involved
15:47
<enoch112>
--^ correct
15:48
alkisg but what do you think it might be that's taking so long to load when it exeeds a number of users?
15:48
I've noticed it kind of stalls at loading pcie for USB
15:48
<alkisg>
enoch112: epoptes takes a long time to load?
15:48
<enoch112>
not that I've noticed
15:49
<alkisg>
the clients take a long time to load?
15:49
<enoch112>
yes
15:49
<alkisg>
do a lan benchmark from epoptes
15:49
<enoch112>
let me see if it happens when booting the one next to me
15:49
sec
15:49
<alkisg>
Also, what do you have, 1 gigabit for 200 clients?
15:50
If it happens when booting just one client, then it's not related to ltsp
15:50
There's no bottleneck with 1 client
15:51
<enoch112>
it's stalling when mounting overlay
15:51
do you know what I mean by that?
15:51
<alkisg>
I think you mean that it's stalling after that message, which is unrelated...
15:51
<enoch112>
it's when booting ALL clients after X clients are already online
15:51
<alkisg>
dmesg might help; also checking if it happens with one client would help
15:51
Then it might be related to file handles on the server
15:52
ulimits etc
15:52
<enoch112>
just recorded a vid
15:52
sec
15:53
https://cloud.danielhansson.nu/s/zf2ixs5j48msj63
15:53
it starts to stall here: https://cloud.danielhansson.nu/s/3ZwbcexxN4dCPtM
15:54
so let's say 15 cleints are online, this happens on the 16:th 17:th 18:th an so on
15:55
clients*
15:59
if 14 clients are online #15 boots just fine
15:59
it's just like there's a limit for how much it can handle
16:09
<alkisg>
yup, server ulimits
16:09
there have been some notes about that in the mailing lists; open a community issue
16:10* enoch112 is googling how to raise ulimits
16:10
<enoch112>
it's set to 2014 now
16:11
1024*
16:11
what does get affected? RAM, CPU, DISK?
16:12
<alkisg>
probably open files ulimit
16:12
<enoch112>
so no need to increase RAM or something like that to cope with the "new load"?
16:13
<alkisg>
No, just edit a config file
16:13
<enoch112>
ok, thanks
16:13
<alkisg>
np
16:13
Although you didn't answer half the questions :)
16:13
But it should be a good pointer
16:14
<enoch112>
1 GB yes
16:14
<alkisg>
Does that mean 1 gigabit connection?
16:14
<enoch112>
LAN Benchmark shows 1 GB
16:14
<alkisg>
For 200 clients?
16:15
GB is gigabyte, i.e. 8 gigabit
16:15
<enoch112>
no bottleneck with one client, it's when reaching a specific number of clients
16:15
<alkisg>
OK ok check server ulimits, maxconnections etc
16:15
<enoch112>
sorry GBit/s
16:20
will try the ulimit fix
16:20
thank you so much!
16:20
have a nice weekend!
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16:21
<alkisg>
you too :)
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