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


Channel log from 17 September 2011   (all times are UTC)

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01:01
<damormino>
Does anyone know the correct value for the parameter LDM_SESSION in lts.conf in order to use Unity 2D?
01:02
Or should I be using LDM_XSESSION (with the 'X')?
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05:08
<damormino>
LTSP on Oneiric (Ubuntu 11.10) is pretty cool. I got it working with Skype, Youtube, pretty much everything. Works just like a Desktop. And both my server and clients are 64-bit.
05:09
Tomorrow I will try 32-bit clients on the same 64-bit server.
05:10
Has anyone seen any major problems on the Oneiric beta that I should look out for?
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10:43
<markit>
hi ppl, hi alkisg :) I would love if you could explain clearly to me (like "step by step") how do reverse vnc and ssh to assist school computer, besides what is included in your sch-script (so I can use also for single PC I have at school, or for home pc of teachers), is it possible?
10:43
I could create some basic ruby script for ease this as much as possible, once mastered
10:44
<alkisg>
No script needed
10:44
Let's see the shared screen session first:
10:44
<markit>
I thought x11vnc was a really slow solution, but I've seen you have been able to assist me with that
10:44
ok
10:44
<alkisg>
!socat-screen
10:44
<ltsp>
alkisg: socat-screen: to share a local thin client shell with a remote person, see https://help.ubuntu.com/community/UbuntuLTSP/Troubleshooting/socat-screen
10:44
<alkisg>
no
10:44
forget that
10:44
!socat
10:44
<ltsp>
alkisg: socat: One way to share a console with a remote person is: [local pc] socat tcp-listen:5500,keepalive=1 stdio,raw,echo=0 [remote pc] socat SYSTEM:"sleep 1 && exec screen -xRR ra",pty,stderr tcp:server:5500 & screen -l -S ra
10:44
<alkisg>
^This one
10:45
So, you just need to apt-get install socat screen, to port-forward 5500 in your router (only the local pc, the "technician"), and to run this command
10:46
A small wiki page about this in e.g. the ubuntu wiki would be nice. It's not related to LTSP so it shouldn't be under wiki/.../UbuntuLTSP
10:46
I don't think a script is required though
10:46
Wanna try it?
10:46
<markit>
sorry, phone, let me read
10:47
I use screen with ssh, you are using for vnc?
10:48
<alkisg>
I don't want to give a password to the remote person
10:48
I just want to share his screen
10:48
So screen with socat allows me to share a screen without sharing a password
10:49
<markit>
oh, interesting
10:49
and for "reverse ssh"?
10:49
<alkisg>
If you want, you can share a terminal with me:
10:49
sudo apt-get --yes install socat screen
10:49
socat SYSTEM:"sleep 1 && exec screen -xRR ra",pty,stderr tcp:alkisg.dyndns.org:25547 & screen -l -S ra
10:49
That's the reverse shell I'm using
10:49
No ssh involved
10:50
<markit>
so what happens on your side? what program do you have to run in "listening" mode? and how?
10:50
<alkisg>
See the command above
10:50
!socat
10:50
<ltsp>
alkisg: socat: One way to share a console with a remote person is: [local pc] socat tcp-listen:5500,keepalive=1 stdio,raw,echo=0 [remote pc] socat SYSTEM:"sleep 1 && exec screen -xRR ra",pty,stderr tcp:server:5500 & screen -l -S ra
10:50
<alkisg>
I'm running the [local pc] part
10:50
Just one command
10:50
<markit>
ok, now I've "parsed" carefully the comman :)
10:51
so you are tunneling 5500 port? but for graphical display, do you have to run a vnc client in -listen ?
10:51
<alkisg>
Yes
10:51
<markit>
what is "obvious" to you is not to me, sorry
10:52
<alkisg>
That's why I proposed that you try it first
10:52
<markit>
so vnc_client localhost -listen?
10:52
<alkisg>
So that you see what happens both from the "client" side and the "server" side
10:52
<markit>
ok
10:53
<alkisg>
For vnc, I'm using vinagre, the one that comes with gnome
10:53
(that's the technician)
10:53
The user installs x11vnc
10:53
And runs x11vnc -connect <ip>
10:53
The technician needs to have 5500 forwarded
10:53
!x11vnc
10:53
<ltsp>
alkisg: Error: "x11vnc" is not a valid command.
10:54
<markit>
don't understand if are different things... for ONLY graphical assistance, do I still need the screen/socast thing?
10:54
<alkisg>
No
10:54
vnc => graphical
10:54
socat+screen => text based, faster
10:54
<markit>
isn't enough have 5500 forwarded and vnc -listen on your side, and x11vnc -connect IP on other side?
10:55
<alkisg>
Yes
10:55
<markit>
ok, that's clear now :)
10:55
<alkisg>
But with vnc you can't debug thin clients having X problems ;)\
10:55
And it really sucks over slow links
10:55
<markit>
I wondered why socast is listen:5500.. isn't vnc stuff?
10:55
taht puzzles me
10:56
or just because you already have 5500 redirected, so just avoid a different port number?
10:56
<alkisg>
Yes
10:56
<markit>
ah! ok
10:57
but you can have both working at the same time, if you use the same port?
10:57
<alkisg>
No
10:57
That's why I'm using 25547, as I said above
10:57
(for socat)
10:57
And 5500 for vnc
10:57
<markit>
"One way to share a console with a remote person is: [local pc] socat tcp-listen:5500,keepalive=1 stdio,raw,echo=0"
10:57
should be edited and use a different port number, belive me is very confusing
10:58
<alkisg>
!learn x11vnc as One way to share a graphical screen with a remote person is: [local pc] port forward 5500, run: vncviewer -listen [remote pc] sudo apt-get install x11vnc; x11vnc -noshm -connect <technician-ip>
10:58
<ltsp>
alkisg: Error: "remote" is not a valid command.
10:58
<alkisg>
!learn x11vnc as `One way to share a graphical screen with a remote person is: [local pc] port forward 5500, run: vncviewer -listen [remote pc] sudo apt-get install x11vnc; x11vnc -noshm -connect <technician-ip>`
10:58
<ltsp>
alkisg: The operation succeeded.
10:58
<alkisg>
!x11vnc
10:58
<ltsp>
alkisg: x11vnc: One way to share a graphical screen with a remote person is: [local pc] port forward 5500, run: vncviewer -listen [remote pc] sudo apt-get install x11vnc; x11vnc -noshm -connect <technician-ip>
10:59
<alkisg>
!forget socat
10:59
<ltsp>
alkisg: The operation succeeded.
10:59
<markit>
let's say that my teacher has X11 working, because probably I'll have to help with usage more than technical problems
11:00
<alkisg>
!learn socat as `One way to share a console with a remote person is: [local pc] forward port 25547, run: socat tcp-listen:25547,keepalive=1 stdio,raw,echo=0 [remote pc] socat SYSTEM:"sleep 1 && exec screen -xRR ra",pty,stderr tcp:server:25547 & screen -l -S ra`
11:00
<ltsp>
alkisg: The operation succeeded.
11:00
<markit>
is vnc the fastest way? why not use X protocol directly? or any way to use NX in a easy way?
11:00
<alkisg>
If your teacher has X11 working, he can use the sch-scripts GUI
11:01
I don't know of any way to share an NX screen as easily as this
11:01
<markit>
yep, but at home I will not deploy sch-script, could you tell me the basic of it's working?
11:01
<alkisg>
The nomachine NX server supports shadowing (sharing the existing screen), but freenx and neatx don't support that
11:01
<markit>
I would like to have a "assist user" solution that works without sch-script
11:01
<alkisg>
You already know the method, you said it your self above
11:01
<markit>
kde has one included, but does not work if you have effects active
11:02
<alkisg>
(01:54:54 μμ) markit: isn't enough have 5500 forwarded and vnc -listen on your side, and x11vnc -connect IP on other side?
11:02
(01:55:00 μμ) alkisg: Yes
11:02
<markit>
and seems is not very updated
11:02
ok, so vnc is the best solution so far
11:03
faster than X
11:03
in remote conection
11:03
<alkisg>
That's what sch-scripts do, they either run x11vnc or socat, depending on what the teacher selected (gui or shell)
11:03
I also don't know of any easy way to share an X session without VNC
11:03
If you know one, do tell
11:04
So vnc is the *only* solution so far, not the best :)
11:04
<markit>
I don't either :) will google for that. Is sad NX technology is almost abandoned in the "FOSS" part
11:04
<alkisg>
It's very slow and it has keyboard problems etc
11:04
<markit>
also keyboard problems? urgh
11:04
also my teacher's screen is FULL HD, don't think will be easy to transfer
11:04
<alkisg>
Yes, e.g. if I switch to greek locally then I can't type, I need to click on the panel applet to switch to greek remotely
11:05
<markit>
I see
11:05
<alkisg>
That's why I also use socat often, because it's much faster + has no problems with the keybard etc etc
11:05
And the teacher can go on working while I'm fixing stuff
11:05
<markit>
yep, I do love GNU also because you can do administration from ssh
11:06
<alkisg>
Ssh needs port forwarding though, and many schools don't have that
11:06
<markit>
but I probably have to assist about programs, like "why does not print the selected area?"
11:06
<alkisg>
That's why I use socat, instead of instructing them on how to port-forward on their locked down cisco routers
11:06
<markit>
ssh can do reverse as far as I know, so just redirection on your side, no?
11:06
<alkisg>
Not exactly
11:07
You'd need to give them an ssh password for them to ssh to you
11:07
And then tell them to use reverse port forwarding while connecting to you
11:07
And then you could ssh to them, if you used the same user as the one they connected
11:07
It can be semi-scripted, but it's much more complicated
11:07
While socat is a single easy command
11:07
And doesn't even require an ssh server in them
11:08
(so it can be used in ltsp clients too)
11:08
<markit>
well, I can create user "teacher" here, with a decent password, and use this one, no security problems
11:08
I see
11:08
<alkisg>
It's really hard for them to do all this stuff to do reverse port forwarding with ssh
11:08
<markit>
thanks a lot for sharing your wisdom and experience
11:09
<alkisg>
You're welcome, I hope you write a wiki page with them :)
11:09
<markit>
yep, I love to give back
11:09
I had some problems with wiki once logged
11:09
is not very clear how and what to do
11:09
but with random tryies I've been able to edit the ltsp fat page
11:09
<alkisg>
Just visit a page that doesn't exist, and click "create"
11:10
<markit>
I mean, I see the page I want to edit and improve
11:10
I click "login"
11:10
enter my credentials
11:10
then I find myself in a different page, a sort of "welcome" one
11:10
if I re-load the page I want to edit, seems I'm not logged
11:10
<alkisg>
Really? want help with vnc with that? :D :D
11:11
Hehe
11:11
<markit>
I've just recently noticed at the bottom right
11:11
an "edit" link
11:11
I have to try again, I will tell you, and vnc with you just in case, lol
11:13
<alkisg>
You can also ask for help in some irc channel, I think #ubuntu-docs or something
11:13
They're responsible for the wiki
11:13
Yeah I see what you're saying
11:14
It seems like some recent misconfiguration
11:15
But when I did it the second time it worked
11:15
#ubuntu-doc
11:15
<markit>
ah, ok, I'm not mad then!
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11:59
<andygraybeal>
wake up wake up happy morning!@
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12:00
<andygraybeal>
at least EST in the house!
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12:26
<Hyperbyte>
mhmmmm!
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12:59
<andygraybeal>
heya hyper :)
13:13
<Hyperbyte>
Hi! :)
13:23
<andygraybeal>
hows business going?
13:32
<Hyperbyte>
Good!
13:32
Just did a really good radio program (news magazine), even if I do say so myself. :)
13:54
<andygraybeal>
nice! you were interviewed or you came up with the content... or you were the host?
13:54
<Hyperbyte>
Actually I'm the program director at the local radio station here. :P
13:55
But I only do the Top 30 program regularly... every now and then someone calls in sick or whatever and I substitute. :)
13:55
<andygraybeal>
aah i understand, very fun!
13:56
<Hyperbyte>
We have a broad range of people who work on content and on-air presenter texts. I presented/hosted the entire program, did one live on-air interview (other 14 items were pre-recorded) and I also worked on the content a bit.
13:57
I was a bit nervous at the start, because I don't regularly do these kind of programs. I mean, Top 30 is a bit 'simple' compared to news magazine. Very different.
14:00
But I'm very satisfied with result. :)
14:22
<andygraybeal>
nice :)
14:23
i'm comparing Zarafa to GroupOffice at this moment. I thought Zarafa only had shared calendars in the non-community version but someone i think is telling me they do. I know group-office does for sure, and that was my first choice.. now i'm confused.
14:24
<Hyperbyte>
Neither of those ring any bells with me. :o
14:31
<andygraybeal>
yea.. group ware applications.... i don't know.. maybe i'm crazy. but i want the folks around here to use the calendar app w/o using google calendar.
14:34
<Hyperbyte>
I use a PHP web calendar...
14:34
As a local web application
14:40
<andygraybeal>
nice, i've been using zentyal for it's ldap... single-sign-on ability. eventually i want to get it integrated with ltsp, but there is time for that to happen in the future.. i want to switch to fat clients first.. so many things to figure out.
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