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


Channel log from 22 June 2011   (all times are UTC)

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03:16
<nosedrum>
join #centreon
03:19
<Appiah>
why
03:33
<NeonLicht>
What is the current way to use USB memmory sticks on the clients now, please? I believe I read somewhere that setting local-devs is not necesary? The client detecs the drive and creates the device (/dev/sda and /dev/sda1)
03:34
<muppis>
NeonLicht, which distro? I don't rely my memory.
03:38
<NeonLicht>
I use Debian GNU/Linux Squeeze.
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03:40
<muppis>
NeonLicht, ach. Then I don't know. I've heard about bug in Ubuntu with amd64 clients.
03:42
<daduke>
howdy y'all. We also fell victim to https://bugs.launchpad.net/ubuntu/+source/indicator-session/+bug/474392 (LTSP users can shut down the terminal server) and now keep wondering why it's marked 'low' and hasn't been addressed in 2+ years.. Kinda important in a multiuser environment...
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03:44
<Appiah>
never seen that issue
03:44
and still present in natty?
03:45
I've used jaunty and karmic mostly
03:46
"this is a buig in indicator session missing the patch from bug #282610"
03:46
and that bug says fix released
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03:46
<XTaran>
Morning.
03:46
<daduke>
Appiah: well it doesn't seem to be fixed for us...
03:47
<Appiah>
have you been upgrading all along?
03:47
or is this a fresh install?
03:47
<XTaran>
daduke: Natty on plimpy IIRC, lucid on plompy.
03:47
<daduke>
Appiah: right now it's a fresh install
03:48
<XTaran>
daduke: tarzeau will come here.
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03:48
<Appiah>
scary
03:48
<XTaran>
Appiah: :)
03:48
<Appiah>
Would be nice to know what's causing this beacuse I have not seen it on my LTSP installs
03:48
<daduke>
Appiah: I'm just here to break the ice :) tarzeau knows the details
03:48
<tarzeau>
daduke: auf plompy haben wir 10.04.2 (lucid) und auf plimpy (natty, 11.04)
03:50
<daduke>
Appiah: one possibility could be gnome settings in users' homes as some of them have a 5+ year history
03:50
<Appiah>
oh
03:50
that would be confirmed by creating a new user?
03:51
<XTaran>
daduke: But if they cause such issues, that's a big bug.
03:51
<daduke>
Appiah: true. tarzeau?
03:51
<XTaran>
daduke: plimpy is currently at Dalco because of spontaneous shutdowns... *sigh*
03:52
<Appiah>
umm do the users get 2 options? shutdown (server) and shutdown client? or is it just "shutdown" and thats the server?
03:52
<tarzeau>
daduke: yes gnome configuration files have cause problems since i've been here
03:52
daduke: afer every major update (that's about every 2 years)
03:52
(kde isn't better in that case though)
03:54
<daduke>
tarzeau: can you answer this? (2 options) [12:52]
03:55
<tarzeau>
Appiah: just shutdown, just like it was a local machine, just like at here:
03:55
<Appiah>
ah ok
03:56
<tarzeau>
https://bugs.launchpad.net/ubuntu/+source/indicator-session/+bug/474392
04:02
<alkisg>
daduke: see also this: https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/491940
04:03
I proposed a patch in gnome-session that made reboot/shutdown work for the client instead of the server
04:03
It never got accepted :-/
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04:06
<daduke>
alkisg: interesting. Anyone here who would be willing to give this some street cred? vagrantc?
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04:16
<alkisg>
Btw, about https://bugs.launchpad.net/ubuntu/+source/indicator-session/+bug/474392/comments/3 :
04:16
LTSP doesn't provide any policykit related configuration files. It uses the defaults. The defaults should also work for ssh -X, nx, x2go, xdmcp and others. This problem isn't specific to LTSP.
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04:41
<daduke>
tarzeau: ok then we need to look someplace else
04:42
alkisg: thanks. I was not aware of that.
04:50
<alkisg>
tarzeau, daduke: if you're able to shutdown the server from indicator-session, then that means that the policykit defaults have changed in natty, and allow remote users to shutdown the server through dbus calls
04:51
You should see some entry about the change in the policykit changelog
04:51
And of course you can revert the change until the bug is resolved
04:52
<daduke>
alkisg: thanks for that
04:52
<tarzeau>
or we just rename /sbin/shutdown as suggested in some bug report at ubuntu
04:52
(which works)
04:52
<XTaran>
tarzeau: Until someone finds it.
04:53
<tarzeau>
removing indicator-session doesn't help (no more logout possible in unity), as one can still do ctrl-alt-del to get another menu to shutdown
04:53
<alkisg>
Locating + overriding the policykit setting sounds like a better approach, you'd do that with a file in /etc, preserved across updates and everything
04:53
No need to take such drastic measures like renaming /sbin/shutdown
04:54
<tarzeau>
suggested here: http://ubuntuforums.org/showthread.php?t=1427933
04:55
<XTaran>
alkisg: I can't find any consolekit/policykit related files in the ltsp-server package, neither in lucid nor natty. Any hint on where to look at LTSP's way to change policykit's configuration?
04:55
<alkisg>
tarzeau: IMHO it's not a good suggestion :D
04:55
XTaran: it's not at all LTSP related
04:55* XTaran nods.
04:55
<alkisg>
Start here: dpkg -L policykit-1
04:55
<tarzeau>
alkisg: i agree, but if it's the only possible solution - except patching the broken software?
04:56
<XTaran>
alkisg: Yeah, I'm already through that.
04:56
<alkisg>
Somewhere there is the setting you're looking for, and it's been changed from lucid to natty apparently
04:56
So you just create a new file in /etc to override that, and you're done
04:56
<XTaran>
alkisg: But I'd expect that LTSP ships an appropriate config to disable that.
04:56
<alkisg>
No, LTSP doesn't care about policykit
04:57
nx, ssh -X, xmdcp, x2go etc also don't care about it
04:57
<XTaran>
alkisg: Interesting. So by default, LTSP users can shutdown the LTSP server?
04:57
<muppis>
alkisg, you gave me url about usb mounting in amd64, but I lost it. :(
04:57
<alkisg>
All those are just "remote users" - and policy kit defines defaults for their configuration
04:57
<XTaran>
alkisg: I see. That's the hint I looked for (I hope :)
04:57
alkisg: Thanks!
04:57
<alkisg>
XTaran: if what you're saying is true, then you should see an entry in policykit saying:
04:58
"allowshutdown: remote admin, local admin" (don't remember the syntax)
04:58
And you'd just need to remove the remote part there
04:58
<XTaran>
alkisg: That's another helpful hint, thanks! :)
04:59* XTaran tried to look for org.freedesktop.consolekit.manager.stop et al.
05:03
<alkisg>
Right, in my lucid box, for org.freedesktop.consolekit.system.stop I have:
05:03
<allow_inactive>no</allow_inactive>
05:03
<allow_active>yes</allow_active>
05:04
And as the ltsp (remote) users are by default considered inactive, they don't have the rights to shutdown the system
05:04
<XTaran>
alkisg: How or where can I see that?
05:04
<alkisg>
cat /usr/share/polkit-1/actions/org.freedesktop.consolekit.policy
05:04
Btw pastebin that in order to compare the natty version to my lucid
05:05
Because if that has not changed, then the definition of "active" has changed to include ssh users too
05:05
<XTaran>
<allow_active>auth_admin</allow_active>
05:05
(from natty)
05:05
<alkisg>
For <action id="org.freedesktop.consolekit.system.stop"> ?
05:05
<XTaran>
And it's <action id="org.freedesktop.policykit.lockdown">
05:05
<alkisg>
No, not lockdown
05:05
<XTaran>
There is no stop anymore in that file.
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05:06
<alkisg>
Grep that directory for consolekit
05:06
<XTaran>
alkisg: http://paste.debian.net/120634/
05:06
<alkisg>
To see where it stores its actions
05:07
XTaran: wrong file?
05:07
05:07
Not policykit...
05:07
<XTaran>
alkisg: Ah, fsck, my fault, sorry.
05:08
alkisg: Yeah, still in there.
05:09
<alkisg>
XTaran: can you run `ck-list-sessions` on a natty ltsp server, with some ltsp user connected?
05:09
We'll see if the definition of "active" has changed with this...
05:09
<XTaran>
alkisg: Unfortunately currently not.
05:09
<alkisg>
OK, note it down for when you're able to continue troubleshooting this
05:10
<XTaran>
Argh. And I was still logged in on the lucid LTSP server. Meh.
05:10
But a (non-LTSP) natty host looks similar.
05:11
<alkisg>
The question is, if ssh users are considered "active" in natty output of `ck-list-sessions`
05:11
<XTaran>
Anyway, I'll experiment with changing or copying those files for a more severe lockdown.
05:11
alkisg: At least not root. Just a sec for a normal user.
05:12
<alkisg>
XTaran: don't modify those files, those are the package defaults
05:12
Put your settings in /etc instead
05:12
<XTaran>
alkisg: I know
05:12
<alkisg>
OK
05:12
<XTaran>
alkisg: Normal ssh login is not regarded as active according to ck-list-sessions.
05:13
<alkisg>
Then I wonder how the user can initiate shutdown, if he's inactive an PK prohibits him
05:13* XTaran too.
05:13* XTaran tries to get all users not being able to shutdown the box.
05:15
<XTaran>
CK/PK is uncharted territory for me, who's usually using tiled window managers and was fine with linux on the desktop before this stuff came to the surface.
05:15
s/tiled/tiling/
05:17
alkisg: Do you have one more hint for me? Where in /etc/ should these files go? /etc/polkit-1 and /etc/ConsoleKit don't contain any XML files, only INI syntax files.
05:18
<alkisg>
XTaran: I remember a man page or readme file telling exactly where each part should put its configuration (packages, vendors, sysadmins etc)
05:18
So try man pages + readme first
05:19
Yeah I agree about PK/CK too, even though I only switched 3 years ago...
05:19
<XTaran>
Well, what I read so far from PK/CK documentation was quite incomplete, but I'll look again.
05:19
<alkisg>
They don't sound too well structured to me
05:20
XTaran: it's there in `man polkit`, I just looked for it again
05:20
Ah no it just lists the different sources there. Well. anyway, gotta go. Bb
05:20
<XTaran>
alkisg: Thanks anyway.
05:21
alkisg: The hints helped me a few steps forward.
05:21
<alkisg>
You're welcome
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05:36* tarzeau has gotten a bad headache from seeing how something is achived compared to how much easier it could've been done
05:36
<XTaran>
Ok, got it. Changing some "allow" to "deny" in /etc/dbus-1/system.d/ConsoleKit.conf helped.
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07:12
<bkone>
I am thinking about setting up ltsp using openSUSE. I currently have about 10 PCs that are using openSUSE for just web kiosk machines. I want to use ltsp so I only have one image to maintain and was wondering how many PCs can run from one instance of ltsp? The main machine is a 2proc, 2GB RAM machine. Will those specs works? Could I use a VM to host ltsp server?
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07:14
<bkone>
I also should mention we already use PXE on the network so I am wondering how that will work. We use PXE to allow for booting into a Symantec pxe boot so Ghost can be ran to re-image PCs. WIll I need to modify something on the DHCP server?
07:16
<dingz>
bkone: you can server diffenent stuff to different hosts
07:17
serve even
07:17
depending on their mac-address for example
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07:33
<bkone>
Where or how do I configure that? I was thinking about doing MAC address so when one of the ten machines came online during the PXE boot it would see the MAC address and know to load the ltsp openSUSE image. Is this done on the DHCP server?
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08:58
<dead_root>
so... the fat clients do a great job of auto-mounting a /home directory when a user logs in, but it wont mount if the user's home directory is in /opt/ltsp-users. is there anywhere i can change /home to /opt/ltsp-users in the login mount script?
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09:00
<dingz>
bkone: yes, that's done on the dhcp-server, or better yet the pxe-server
09:00
but by now you're gone, so you'll probably never know ;-)
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09:11
<alkisg>
dead_root: try setting LDM_HOME in lts.conf
09:11
(assuming you're using the default sshfs, and not nfs)
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09:14
<alkisg>
Nah sorry that's an internal variable. It should work with any user home dir, as long as it's in /etc/passwd though
09:15
Are you using symlinks?
09:15
<dead_root>
no
09:16
the home dirs on the server are an nfs4 mount to a different server
09:17
<alkisg>
Why not use nfs_home instead of the default sshfs home then?
09:17
But ok, it should still work
09:17
<dead_root>
because there are non ltsp clients on the network, like windows computers, and i dont think nfs is secure enough
09:18
the servers have their own network that nfs can talk on
09:18
<alkisg>
OK. So, /opt/ltsp-users is directly mounted with nfs4, and it's also listed as the user home in /etc/passwd?
09:19
<dead_root>
they are ldap users, but you can getent passwd and it shows /opt/ltsp-users/ltsp1
09:19
etc..
09:20
<alkisg>
Can you get the output of `mount` of the fat client, when a user is (not really succesfully) logged in?
09:20
<dead_root>
yes i can ssh to the fat client
09:21
<alkisg>
Also, you can try and see if sshfs works over nfs4, from e.g. a standalone pc on your network (not fat client)
09:21
<dead_root>
http://pastebin.com/Hr5cdnVY
09:21
k
09:22
<alkisg>
Since you have ssh to the fat client, you can do that from there too
09:24
E.g. sshfs user@server:/opt/ltsp-users/user /mnt
09:25
<dead_root>
i might have the client pointing to the wrong ldm server, one sec
09:25
i am going to feel so stupid if that was it
09:39
alkisg i feel real stupid. my whole problem was i pointed the client at the wrong ldm server, thanks for you help
09:39
<alkisg>
np
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11:29
<sunscreen>
any ideas why m$ terminal server/rdesktop is pooping after several logout's ?
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11:30
<sunscreen>
one thing i am noticeing with ltsp .. is that when the clients are sitting in the rdesktop session the screen keeps blanking and restarting like the startx is dieing or in some sort of refresh looping
11:31
thats before rdesktop login actually takes place
11:31
/join ##windows
11:36
the weird thing is all seems well till i remote desktop'ed into the the terminal server using a fat client (win7) while i had the same user logged in.. but i dont know if thats just coincidental that it crashed at that time
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11:52
<TheMatrix3000>
http://screencast.com/t/1kejmeZm3OX
11:52
can anyone explain that kinda of crazyness
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12:00
<TheMatrix3000>
http://screencast.com/t/1kejmeZm3OX can anyone explain that kinda of crazyness
12:05
<mgariepy>
TheMatrix3000, which version ?
12:05
lucid ?
12:06
did you try disabling nbd_proxy in your pxelinux.cfg/default
12:06
?
12:06
<TheMatrix3000>
yea
12:06
how do i disable it in pxelinux.cfg default
12:07
<mgariepy>
add nbd_proxy=false to your boot parameter
12:08
<TheMatrix3000>
ok added nbd_proxy=false to after teh quiet splash
12:08
<mgariepy>
try to reboot
12:08
<alkisg>
A newer ltsp_nbd is also needed for Lucid
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12:08
<TheMatrix3000>
alkisg, i think i need that link again
12:08
cause my chats purge after a certain point
12:09
it was a bug report with comment #13 you wanted me to read
12:09
<alkisg>
TheMatrix3000: you can check the irc logs, see the link in the /topic
12:09
They are stored online
12:09
<TheMatrix3000>
where ?
12:09
oh ok
12:09
<alkisg>
Write: /topic
12:09
<TheMatrix3000>
hey
12:09
the link in /topic is bad
12:09
has a , in it
12:10
<alkisg>
Nah your client should have stopped parsing the url at that point
12:10
What are you using?
12:10
<TheMatrix3000>
trillian lol
12:11
<alkisg>
Anyway here's the link: https://bugs.launchpad.net/ltsp/+bug/589034
12:11
<TheMatrix3000>
i can just do a wget http://bazaar.launchpad.net/~ltsp-upstream/ltsp/ltsp-trunk/annotate/1777/client/initramfs/scripts/ltsp_nbd
12:11
right
12:11
<alkisg>
The nbd_proxy=false parameter was released in Maverick, that's why a more recent ltsp_nbd is needed in Lucid
12:12
(I mean, support for the nbd_proxy parameter)
12:15
<TheMatrix3000>
ok, trying it now
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12:31
<sunscreen>
The terminal server received large number of incomplete connections. The system may be under attack.
12:31
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. == event log
12:33
<TheMatrix3000>
didn't help
12:33
now it just sits at this
12:33
http://screencast.com/t/3Th5cnelYJl
12:33
esc does nothing
12:38
any suggestions
12:40
<alkisg>
TheMatrix3000: press esc to see the output
12:40
Or remove quiet splash
12:44
<TheMatrix3000>
ok
12:44
esc wouldn't work
12:44
so ill remove quiet boot
12:44
quiest splash i mean
12:45
haha forgot to readd IPAPPEND 3
12:45
<alkisg>
That's what the next 2 steps are for
12:45
So that you don't have to put it again and again after each ltsp-update-kernels
12:45
<TheMatrix3000>
yea
12:45
im just trying to get it to work before that step
12:46
removed the quiet splash
12:46
ah kernel panic
12:46
http://screencast.com/t/FbzieXBj08W
12:47
<alkisg>
Probably you didn't manage to correctly edit ltsp_nbd
12:47
Maybe you used wget and you got an html page?
12:47
Try: head -n 3 /opt/ltsp/i386/usr/share/initramfs-tools/scripts/ltsp_nbd
12:47
<TheMatrix3000>
haha
12:48
yea
12:48
lol
12:48
how can i download it without wget
12:48
<alkisg>
You can use wget
12:48
Just put quotes around the url
12:48
<TheMatrix3000>
ah ok
12:49
<alkisg>
As it contains symbols that are interpreted by the shell as commands etc
12:50
<sunscreen>
ahaha!!
12:50
<TheMatrix3000>
yea it still did it
12:50
downloaded it using ""
12:50
and it still gave me a webpage
12:50
<alkisg>
What's the command that you're using?
12:50
<TheMatrix3000>
sudo wget "http://bazaar.launchpad.net/~ltsp-upstream/ltsp/ltsp-trunk/annotate/1777/client/initramfs/scripts/ltsp_nbd"
12:51
<alkisg>
Nope
12:51
<sunscreen>
i think ltsp is making my terminal server think its under attack
12:51
<alkisg>
Visit that page. There's a download link
12:51
<TheMatrix3000>
head -n 3 /opt/ltsp/i386/usr/share/initramfs-tools/scripts/ltsp_nbd
12:51
<alkisg>
TheMatrix3000___: then use the download link, not the bazaar url
12:51
<TheMatrix3000>
ah ill use scp to get it to the server then
12:51
<alkisg>
In the right side, "download file"
12:52
<sunscreen>
just a theory ... has this ever arsed as a issue before now?
12:52
<alkisg>
sunscreen: windows has a setting for how many seconds an rdp session can "sit" in the login screen
12:53
<TheMatrix3000>
there we go thanks alkisg
12:53
<alkisg>
By default it's just a few secs, so if you have an ltsp rdesktop client, it'll keep reconnecting e.g. twice per minute
12:53
sunscreen: so if that's the problem, you need to search for that windows setting and increase it to e.g. half an hour
12:53
Try #windows :)
12:54
<sunscreen>
ok tnx :D i found this one too and gave it a value of 50 as per some ones instructions 'MaxOutstandingConnect'
12:56
<TheMatrix3000>
well i got to a blank screen haha
12:56
i think it's working
12:57
nope
12:57
i get this now alksig
12:58
http://screencast.com/t/t83JMwUtq
12:58
that's after the gnome login screen
12:58
<alkisg>
Do you have ubuntu-desktop installed on your server?
12:58
<TheMatrix3000>
not on the server side
12:58
<alkisg>
Yeah that's the problem then. You need a desktop environment for the thin clients.
12:58
<TheMatrix3000>
i thought ltsp-build-client
12:59
did that
12:59
<alkisg>
LTSP clients are like windows machines doing an rdesktop to your server
12:59
<TheMatrix3000>
or do i have to do a chroot apt-get install
12:59
<alkisg>
If you don't have a DE on your server, they can't show anything
12:59
<TheMatrix3000>
ah ok
12:59
<alkisg>
No, you need to install ubuntu-desktop on your server
12:59
<TheMatrix3000>
hmm really
12:59
we don't on our current one
13:00
we have no gui on the server itself just for the ltsp clients
13:00
ok, so just run a apt-get install ubuntu-desktop
13:00
<alkisg>
That can't be true, so you either have a DE on your server, or you're using fat clients currently :)
13:00
Or better yet with tasksel
13:01
<TheMatrix3000>
whats tasksel
13:01
i didn't set the current one up
13:01
so
13:01
lol
13:01
i guess ill be installing ubuntu-desktop
13:01
<alkisg>
Run this:
13:01
sudo tasksel
13:01
It'll show a menu
13:01
Select ubuntu-desktop there.
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13:02
<TheMatrix3000>
i already ran sudo apt-get install ubuntu-desktop
13:02
<alkisg>
Suit yourself
13:02
:)
13:02
<TheMatrix3000>
lol
13:02
didn't know about tasksel
13:02
that's pretty cool
13:02
<alkisg>
It
13:02
It's the recommented way to install ubuntu-desktop
13:02
<TheMatrix3000>
so do i have to do a ltsp-update-image
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13:02
<alkisg>
No
13:02
<TheMatrix3000>
or anything like that afterwords
13:02
<alkisg>
Just logoff + logon the client
13:02
<TheMatrix3000>
it'l just work
13:02
<alkisg>
Not even reboot
13:02
<TheMatrix3000>
ok sweet
13:03
alkisg, i hope you make over 100k a year doing whatever it is you do
13:03
<alkisg>
Hehe, teaching :)
13:04
<sunscreen>
alkisg, i think its this one "Set time limit for disconnected sessions"
13:05
<alkisg>
sunscreen: I don't think so, I think that's for already logged on users
13:07
<sunscreen>
wondering if i should be using keep alive connections as well :
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13:12
<sunscreen>
interesting feature of terminal server there
13:19
<TheMatrix3000>
yea, i can't wait till im done with this ltsp server
13:19
we are going from a dual core athlon
13:19
to a dual xeon quad core
13:19
2.0 ghz with 8gb ram
13:19
and two SAS 15k 146gb drives
13:19
8 processors lol
13:19
<sunscreen>
https://help.ubuntu.com/community/SeamlessVirtualization
13:20
<TheMatrix3000>
i saw that on the ltsp-cluster site
13:20
that's amazing
13:20
i mentioned it to my boss
13:20
for int eh future to invest in a windows server and some TS licenses
13:21
<sunscreen>
yeah i am kind fore head slaping my self.. for not giving my vbox guest enough hdd space
13:22
duno what the hell i was thinking
13:22
gave it 15gb
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13:42
<sunscreen>
daaamn
13:42
remember our little chat the other night to provision access to m$ terminal server
13:42
http://www.2x.com/securerdp/ <-- not a bad option .. and its free :]
13:45
jesus rdp over inet is paaain!!
13:46
wtf
13:46
doggy fuckers
13:47
you submit you details to download the 2xRDP crap and it takes you to there support forums and fails to give you the download perhaps they might email it
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14:05
<TheMatrix3000>
ok, trying to install firefox 5 to ltsp as local app
14:05
i cannot add the ppa using chroot
14:05
how do i do it?
14:05
is there a repository for the ppa
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14:26
<sunscreen>
lalalalla
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14:53
<sunscreen>
well i think i got to the bottom of why terminal services are crapping them with ltsp/rdesktop
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14:56
<sunscreen>
the problem arises when you have multiple ltsp clients all running rdesktop, then when they are all sitting at the login screen they must all get booted after a while, then they reconnect and this is triggering "termserv's" defense system which is to just shut down lol..
14:59vagrantc (~vagrant@75-150-46-245-Oregon.hfc.comcastbusiness.net) joined #ltsp.
14:59
<sunscreen>
I can not find the settings alkisg suggested specifically, but some suggestions suggestions from Mockstar and ||cw form #windows-server is to setup the rdesktop scritps to only activate rdesktop when the screensaver is deactivated or make a zenity dialog to with a click button to "start session"
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15:39
<Gnoze5>
yo
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18:24
<TheMatrix3000>
anyone know how to get firefox 5 on thin client
18:26
as a local app
18:45
<highvoltage>
you just install it in your thin client chroot like any other local app? presumably from a ppa?
18:47
<TheMatrix3000>
it didn't take the command
18:47
but I did find teh deb repository
18:47
and I think i have it now
18:47
well i added firefox-stable and got 4.0
18:47
think firefox-next will have 5.0
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20:17
<sunscreen>
how can you connect to the ldm
20:17
from a normal linux machine
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20:53
<TheMatrix3000>
anyone running italc on ubuntu 10.04
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00:00--- Thu Jun 23 2011