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


Channel log from 3 December 2012   (all times are UTC)

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11:03
<vmlintu>
Would anyone have ideas on how to get rid of the server-entry on ltsp client in /etc/hosts in a nice way? It's written my init.ltsp.d/09-hostname here: http://bazaar.launchpad.net/~ltsp-upstream/ltsp/ltsp-trunk/view/head:/client/share/ltsp/init-ltsp.d/09-hostname
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11:04
<vmlintu>
There's an override option with /etc/hosts.ltsp, but I'd rather just have the dynamic file without the $SERVER server line. The current configuration breaks kerberos as reserve DNS doesn't work.
11:05
I've been overwriting it before, but I'd rather now fix this permanently as this probably breaks other things too..
11:06
<work_alkisg>
Can't you just put a reverse dns entry for server?
11:06work_alkisg is now known as alkisg
11:06
<alkisg>
(and a forward one...)
11:06
<vmlintu>
alkisg: Sorry, what do you mean?
11:06
<alkisg>
I mean, what's the reason that reverse dns fails?
11:07
It's because "server" is not declared in dns properly, right?
11:07
So, why not just declare it?
11:07
<vmlintu>
The reverse name is not correct. If /etc/hosts defines it as "server", it breaks, because it's not the same as forward name
11:08
And forward name cannot be server
11:08
<alkisg>
Because of the domain name suffix?
11:09
<vmlintu>
So if I have forward record ltsp1.test.edu A 192.168.6.12, reserver 192.168.6.12 for must return ltsp1.test.edu
11:09
reserver->reverse
11:09
<alkisg>
And you cannot have a "server 192.168.6.10" entry in your dns?
11:09
Without test.edu or anything else?
11:10
<vmlintu>
No, because kerberos would then look for principal named server instead of server's own principals.
11:10
<alkisg>
Ah, kerberos only works under the same domain name?
11:11
<vmlintu>
Kerberos needs fqdn names everywhere and forward and reverse names must match.
11:11
<alkisg>
Got it
11:12
And what if you leave "server" in /etc/hosts, but just use a different "SERVER" name in lts.conf, with full fqdn?
11:12
<vmlintu>
Kerberos can connect different domains together through cross-realm authentication. So ltsp1.test.edu could also authenticate to ltsp1.test2.edu if setup correctly
11:14
As the ltsp server is also kerberos server, it breaks if in /etc/hosts the server's ip points to anything but server's fqdn
11:15
<alkisg>
So, if you have "192.168.6.10 server" in client /etc/hosts, and "192.168.6.10 fullservername.test.edu" in your DNS, and specify SERVER=fullservername.test.edu in lts.conf, it breaks?
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11:17
<alkisg>
I mean that the client would never use the "server" /etc/hosts entry in this case
11:17
<markit>
hi alkisg :)
11:17
<alkisg>
Hi markit
11:18
<vmlintu>
I'm using lightdm to login to fat clients instead of ldm so the SERVER is not really used for anything.
11:18
If ldm + SERVER in lts.conf would be used, kerberos would not be really used at all
11:19
I'm using pam_krb5.so + pam_exec.so + nss_extrausers with this script for lightdm logins: https://github.com/opinsys/puavo-ltsp/blob/master/puavo_pam_login
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11:21
<vmlintu>
Everything works perfectly if /etc/hosts doesn't have the "$SERVER server" line, so I'm trying to figure out how to make this all clean..
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11:23
<muppis>
http://media.riemurasia.net/albumit/mmedia/pk/doe/mhsk/466447/1103650802.jpg
11:23
<vmlintu>
The idea here is that when lightdm authenticates the user with pam_krb5, user gets a kerberos ticket. That ticket is then used to query the server for NSS records. After that lightdm logs in the user and user's home directory is mounted with NFSv4+krb5. This way also the NFS exports are authenticated.
11:23
<muppis>
Hups. Wrong channel.
11:34
<vmlintu>
This same problem happens actually also with normal LTSP fat clients if one uses kinit to get a kerberos ticket after logging in with ldm and then tries to use the ticket to connect to the ltsp server with fqdn.
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17:42
<mikec>
does anyone know if there's a simple-ish way to keep ltsp application nodes 100% similar with regards to packages? I'm using Puppet Enterprise - can't seem to find a lot of talk about that
17:42
i can clone packages, but certainly don't want to sit around doing that by hand. i figured there would be an easier way using their console
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18:17
<||cw>
mikec: there's an ltsp cluster project, I'm not very familiar with it though
18:18
well, not at all familiar actually, I just know it exists
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18:50
<sharktopus2012>
hello
18:51
has anyone had any luck with remotefx using freerdp?
18:53
<||cw>
sharktopus2012: assuming your thin clients meet the hardware reqs, I don't see why it wouldn't work
18:54
you'd want to set it up like the rdesktop screen mode though, not running from the ltsp server, since that is almost certain to not accelerate properly
18:55
please keep in channe;
18:55
<sharktopus2012>
sorry, is freerdp what ltsp uses native?
18:56
<||cw>
and probably not, until the host distro switches
18:56
adding a new screen mode is not hard though
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18:57
<sharktopus2012>
right now I'm using ltsp just to boot clients to rdp using SCREEN_07 = rdesktop in the lts.conf
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18:58
<sharktopus2012>
works fine, I'm just wondering how to go about getting sound to work better..
18:58
which is why I was curious if ltsp uses freerdp
19:02
<vagrantc>
depends on what version of LTSP you're using
19:03
depends on your distro as well
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19:15
<ltspuser_56>
I installed edubuntu 12.04 in a school with about 40 clients. We want to use some of the Micro PCs like MK802 or Raspberry Pi or some of the tablets as clients. Since none of the devices have PXE to boot to the network I need another method. I am thinking an Android app that will connect to the LTSP LDM. Any ideas where to start such and APP?
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19:31
<vagrantc>
ltspuser_56: those devices have arm processors, so you'll need to build an arm environment to run them...
19:31
well, the raspberry pi does anyway, don't know about the other things
19:32
ltspuser_56: so you just want to log into the LTSP server?
19:32
but run the OS on the local hardware
19:32
<stgraber>
mk802 is an allwinner a10 so would work with Ubuntu's userspace but there's no kernel in the archive for that chip, so you'd need to build your own
19:32
the raspberry pi is an armv6 board so Ubuntu's userspace won't work at all on it unless you rebuild the whole distribution
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19:35
<vagrantc>
there is debian's armel port, though you'd still need a kernel, or raspbian
19:35
ltspuser_56: though all of these options are fairly complicated
19:36
installing LDM into a non-LTSP environment, while technically possible, will involve a lot of fiddling.
19:51
<alkisg>
40 clients over wireless... that doesn't sound like it'll work. We're trying some D525 atom based clients here this period... x86 based, wired network, pxe etc
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