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


Channel log from 29 December 2011   (all times are UTC)

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10:24
<Yoe>
alkisg: I wanted to work on (finally) integrating that patch of yours, but I can't seem to find it anymore
10:24
alkisg: do you have it somewhere more accessible than in some pastebin? ;-)
10:24
(and sorry about the delay, got caught up in other things)
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11:00
<alkisg>
Hi Yoe, let me look it up...
11:01
Bug report: https://bugs.launchpad.net/ubuntu/+source/nbd/+bug/594595
11:01
Yoe, attachment: https://launchpadlibrarian.net/86381563/nbd-client.initrd
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11:27
<Yoe>
ah, thanks
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11:38
<muppis>
I think I need switch from nbd to nfs in Ubuntu 10.04. Any guide to do that?
11:40
<alkisg>
muppis: https://help.ubuntu.com/community/UbuntuLTSP/LTSPWithoutNFS, but why?
11:42
<muppis>
alkisg, because nbd connection does not survive from failover.
11:43
<alkisg>
Ah, you got load balancing with nfs servers working?
11:43
*fail over
11:43
<muppis>
Not load balacing, simple high availability.
11:44
<alkisg>
Yeah, failover, did you get that working with nfs?
11:45
<muppis>
nfs works fine in other purposes.
11:45
<alkisg>
So if you have 2 nfs servers for root file system, it will automatically failover to the other server?
11:45
<Yoe>
not quite, methinks
11:46
<muppis>
Yes.
11:46
<alkisg>
Yeah I don't believe that either... but if you manage it, do post about it
11:46
<muppis>
And rootfs is synced by drbd.
11:48
<alkisg>
DRBD is for block devices, right? So it may work with NBD, but not with NFS, correct?
11:48
<Yoe>
alkisg: no, he's exporting a DRBD block device over NFS
11:48
<muppis>
Yoe, yes.
11:48
<Yoe>
if you're into that kind of thing, why not do root-on-DRBD? ;-)
11:49
<muppis>
Too complex to add or remove clients using that.
11:49
<Yoe>
how so?
11:50
<alkisg>
Would root-on-DRBD be deadlock-free?
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11:51
<muppis>
DRBD nees local block device to be used.
11:51
<Yoe>
oh, right, forgot about that
11:51
<muppis>
And I'm still doing ltsp based kvm hosts.
11:51
<Yoe>
in fact, that's the whole point of DRBD :-)
11:51
<markit>
hi ppl, hi alkisg :)
11:51
<alkisg>
Hi markit
11:52
<markit>
alkisg: I would love to have a look at lts.conf and ltsp.conf you use with sch-script. At home I had the url of the repository and looked around at the code, but could not find anything useful
11:52
is it "autogenerated" by scripts or am I looking at the wrong place?
11:52
<alkisg>
markit: our lts.conf is pretty much empty, with just about 100 lines of commented-out examples,
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11:53
<alkisg>
but we're using a config.d script in the chroot instead,
11:53
<markit>
(I'm at work at "dinner pause" that recently I do not at the resturant, to save money, sigh)
11:53
<alkisg>
which sets our own "Defaults" for ltsp, based on various info
11:53
<markit>
alkisg: oh, ingenius... will it be upstream someday? :)
11:53
<alkisg>
Nope
11:54
That's what WE want as defaults, not what the whole community :)
11:54
wants
11:54
E.g. we want LDM_DIRECTX=True by default
11:54
<markit>
lol, me too
11:54
alkisg: do you mind send me the lts.conf file by gmail? Just to have a look
11:54
<alkisg>
Because we prefer speed over security
11:54
Here's the commented-out lts.conf: http://bazaar.launchpad.net/~sch-devs/sch-scripts/trunk/view/head:/doc/sch-scripts/examples/lts.conf
11:55
<markit>
argh, in the "doc" dir, maybe I missed it yesterday
11:55
<alkisg>
And here's the script for our defaults: http://bazaar.launchpad.net/~sch-devs/sch-scripts/trunk/view/head:/sch-client/ltsp_config
11:55
<markit>
oh, no I found it but did not got any new ideas
11:55
(mainly because of comments in greek, lol)
11:55
<alkisg>
Hehe, use google translate
11:56
But the idea is that you set your defaults there, and allow teachers to override them at will
11:56
E.g.: # Only enable X_NUMLOCK on workstations, not on laptops
11:56
laptop-detect || export X_NUMLOCK="${X_NUMLOCK:-True}"
11:56
But if a teacher wants X_NUMLOCK=False even on workstations, he can still do that
11:57
<markit>
during installation or can be changed also later and regenerated?
11:57
<alkisg>
That script runs when each client boots
11:58
<markit>
I'm trying to study your code because there are plenty of useful tips I can use with ruby also (shell commands to get config info,for instance)
11:58
<alkisg>
And it sets our defaults, and then one can override them from lts.conf
11:59
<markit>
btw, wondering why there are not commands options to ease the use in scripts, like grab the defautl gw IP or the interfaces available etc.. It's all a "ip grep" trick all around
11:59
<alkisg>
Yeah that would be handy
12:00
Let's hope dbus makes some of those things easier
12:00
<markit>
dbus is "low level" or has to do with graphical things?
12:00
I mean, in a intallation without X at all, is it present and working?
12:00
<alkisg>
It's low level, an interprocess communications system
12:01
So you can use it to ask network manager about the available connections etc
12:01
<markit>
btw, in fat clients, how is "/home" mounted? sshfs? and in fat chroot, /home entry is present (as mountpoint) but empty?
12:01
<alkisg>
By default, sshfs is used, but we prefer to use nfs
12:01
<markit>
I ask because official ltsp .pdf doc states that there is NO home AFAIR
12:02
why? and how? :)
12:02
<alkisg>
I think the .pdf was written before the fat clients implementation
12:02
We just put NFS_HOME=/home in the default lts.conf
12:02
About the "why" part, read the fat clients page
12:02
!fatclients
12:02
<ltsp`>
alkisg: fatclients: You may find some info about the Ubuntu/LTSP implementation of fat clients at https://help.ubuntu.com/community/UbuntuLTSP/FatClients
12:02
<markit>
and it will disable sshfs automagically?
12:02
<alkisg>
Yes
12:03
<markit>
oh, yep, I remember that doc and that part, just thougt was a rare "problem" usually ignored (maybe does not affect KDE)
12:04
<alkisg>
NFS is also very faster than sshfs
12:05
<markit>
argh! better mention it in the doc
12:05* markit loves "fast", but only if reliable also
12:05
<alkisg>
NFS is more reliable than sshfs, yeah
12:06
SSHFS is more secure by default, if you don't configure your NFS for security. We don't really care about that. :)
12:06
<markit>
strange, in general is "fast, reliable, choose one"
12:07
btw, why have this "client side on the fly" setup, instead of entries in lts.conf with mac address of the client?
12:07
<alkisg>
Because I don't know the mac addresses of the clients of 250 schools
12:08
And why would I write a 200.000 lines long lts.conf when I can do it with 100 lines of code?
12:09
<markit>
I've not got the real working of your script... if teacher wants PC01 to have num lock, will a special config file be generated?
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12:09
<alkisg>
markit: let me describe it with an example
12:10
A school has 10 workstations and 10 laptops
12:10
Without the teacher doing anything, numlock will be on for the workstations only
12:10
Another example
12:10
Atheros cards have a bug and need special NFS options
12:10
They'll get those options automatically, without the teacher even knowing that he has atheros cards in his lab
12:10
When?
12:11
The options are applied when the client boots
12:11
<markit>
but how can a pc know is a laptop?
12:11
<alkisg>
The command is "laptop-detect"
12:11
Run it in your box now
12:11
$ laptop-detect && echo "I'm a laptop"
12:12
I'm a laptop
12:12
<markit>
argh, standard command! you know SO MUCH
12:13
really you have to spread your school/ltsp knowledge all over the world
12:13
<alkisg>
So, there are no configuration files being written
12:13
The lts.conf defaults are applied dynamically when the client boots
12:13
<markit>
yep, very clever, is the "know yourself" part that I missed
12:13
(Socrates? :)
12:13
<alkisg>
Haha
12:14
All people here know much about ltsp... they are the reason LTSP exists, I just got advantage of their code and got it in my schools here :)
12:14
<markit>
alkisg: well, "put the pieces together" is very very valuable
12:14
you are "concentrating" a lot of knowledge, experience and theory
12:15
to solving schools problems
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12:16
<markit>
back to work, thanks a LOT as usual, see you :)
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12:27
<muppis>
/scripts/nfs-bottomo/ltsp line 47: Can't create /rootfs/etc/hostname: Read-only file system
12:27
Mind the typos.
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12:49
<alkisg>
I think that warning was fixed at some later version
12:52
<knipwim>
alkisg: did you have a chance to look at my proposed plugin changes?
12:52
<alkisg>
Hi knipwim
12:52
I saw them last night just before going to sleep, so I didn't get a good enough look
12:53
The organization seemed fine
12:53
<knipwim>
:)
12:53
there are probably some rough edges
12:53
<alkisg>
Let's talk about them late in some evening when vagrantc will be around too
12:54
<knipwim>
sounds like a plan
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16:19
<manni>
Hi, I`m looking for some ltsp tweaks
16:20
to speed up everything a little les more
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17:58
<Yoe>
alkisg: you'll laugh at me: it took until now for me to have my root-on-nbd vm up&running again...
17:59
oh well
17:59
<alkisg>
Yoe: hehe no problem, there's no hurry anyway... hurrying would make open-source-programming not fun anymore :)
18:00
If you need any feedback, I'll probably be around for another hour
18:02
<Yoe>
nah, I just need to test and upload
18:03
at leastI hope so :-)
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20:07
<andygraybeal>
greets
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20:24
<Yoe>
"telnet security hole"
20:26
I thought telnet was a security hole by default
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20:28
<andygraybeal>
Yoe, hahah, i thought the same thing when i read the news.
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