Re: [Ltsp-discuss] Cloning LTSP chroot

[Matthew Wyneken]

On 03.09.2013, at 17:33, Vagrant Cascadian  wrote:

> My guess is permissions problemsr; the UID/GID mappings from the chroot to the
> server are often out of sync with dynamically allocated users and groups.
> 
> You'll probably want to rsync with "--numeric-ids".

That did the trick!! It now works like a charm. I wish I had thought to ask a 
few days earlier. It would have saved me hours of futile searching.

Thanks a lot for your help!
Matthew
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[Ltsp-discuss] Remote Desktop For LTSP

[Robert Lefebvre]

We've had pretty good success using the X2Go program to enable remote
access to both our server and our clients but I have just found Guacamole (
http://guac-dev.org/) which looks interesting.

I like it because it doesn't require that a client be installed on the
remote user's machine.

But, on the other hand, I don't like that it uses VNC which I think is
slower than the X protocol that X2Go uses (but I could be wrong).

Having just started looking at Guacamole, it sounds like it can use any
remote server so it might be possible to get the best of both worlds and
have Guacamole access the x2go remote x server.

Guacamole sounded like a good topic for discussion too.



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[Ltsp-discuss] Clustering or app servers?

[Robert Lefebvre]

We are currently running just one Edubuntu 12.04 server with a 6 core AMD
processor and 32 GB of ram but I would like to add 1 or more other servers.

I've looked at the ltspcluster.org site and for other tutorials but they
all sort of start "from scratch".

What I was wondering was if I can add the LTSP cluster suite (such as the
load balancer, ltsp-cluster-agent,ltsp-cluster-control etc) to my current
installation.

And along with that I am wondering whether two independent servers each
with edubuntu 12.04 installed can be clustered to work together?


Thanks

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[Ltsp-discuss] ltsp-localapps xterm fails first time

[Lachele Foley]

We started using VirtualGL.

If we try to "vglrun" something, it doesn't work until we do the following:

ltsp-localapps xterm

This first call will fail to produce an xterm.  But, all subsequent
calls, and all subsequent attempts to use vglrun work normally.

-- 
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Lachele Foley
CCRC/UGA
Athens, GA USA

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Re: [Ltsp-discuss] Clustering or app servers?

[Robert Mavrinac]

You should be able to install the ltsp packages easily. I put the 
ltsp-root, ltsp-loadbalancer and ltsp-cluster-control on one VM and run 
a number of application server VMs. Just make sure your application 
servers have the same configuration/packages once you start load 
balancing between them. You can pretty much follow the instructions for 
which packages to install on which server and just follow the 
instructions. Since you haven't already installed ltsp cluster packages, 
you are pretty much working from scratch, even with your existing server.


Do you mean clustering beyond the load balancing LTSP would provide? 
Clustering may require a lot of other work, including fencing and share 
disks to support fail-over scenarios and certainly doesn't make sense in 
an LTSP cluster.


Beyond load balancing

On 04/09/13 01:37 PM, Robert Lefebvre wrote:
We are currently running just one Edubuntu 12.04 server with a 6 core 
AMD processor and 32 GB of ram but I would like to add 1 or more other 
servers.


I've looked at the ltspcluster.org  site and 
for other tutorials but they all sort of start "from scratch".


What I was wondering was if I can add the LTSP cluster suite (such as 
the load balancer,ltsp-cluster-agent,ltsp-cluster-control etc) to my 
current installation.


And along with that I am wondering whether two independent servers 
each with edubuntu 12.04 installed can be clustered to work together?



Thanks

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Re: [Ltsp-discuss] ltsp-localapps xterm fails first time

[Lachele Foley]

I don't think this is a timing issue.  It's only the first
ltsp-localapps xterm that doesn't work.  All subsequent ones work.
This has to be done once for each login.  After that, all vglrun calls
and all subsequent calls for ltsp-localapps xterm work.  I don't think
we've tested other localapps calls as a "first".

Of course, the way we found this workaround was in trying to open a
local xterm to see why vglrun wasn't working.  The first attempt to
open an xterm didn't work, so we tried again, and it worked.  Then, we
tried to repeat the vglrun behavior and suddenly it worked.




On Wed, Sep 4, 2013 at 4:00 PM, Jeff Siddall  wrote:
> On 09/04/2013 01:57 PM, Lachele Foley wrote:
>> We started using VirtualGL.
>>
>> If we try to "vglrun" something, it doesn't work until we do the following:
>>
>> ltsp-localapps xterm
>>
>> This first call will fail to produce an xterm.  But, all subsequent
>> calls, and all subsequent attempts to use vglrun work normally.
>
> Not sure I have an answer to your question, but I have observed some
> strange timing issues with ltsp-localapps.  If I run two ltsp-localapp
> commands too quickly the second never gets run.
>
> Jeff
>
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[Ltsp-discuss] Empty USB sticks on openSUSE 12.3

[Christian Schött]

Hi,

at our school we run LTSP on openSUSE 12.3 64bit. When you connect an USB 
stick to a client, the device icon appears on the KDE desktop, but the inside 
of the folder in /media/username/ is empty.

I didn't use the Education-Life-DVD, but installed the packages from the 
server:ltsp-repository and from the education repository. I use aoe and it 
worked well with openSUSE 12.2, but with 12.3 it doesn't.

Do I have to put the users into a special group, to let them mount USB-
devices?

Thanks,

Christian

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Re: [Ltsp-discuss] ltsp-localapps xterm fails first time

[Jeff Siddall]

On 09/04/2013 01:57 PM, Lachele Foley wrote:
> We started using VirtualGL.
>
> If we try to "vglrun" something, it doesn't work until we do the following:
>
> ltsp-localapps xterm
>
> This first call will fail to produce an xterm.  But, all subsequent
> calls, and all subsequent attempts to use vglrun work normally.

Not sure I have an answer to your question, but I have observed some 
strange timing issues with ltsp-localapps.  If I run two ltsp-localapp 
commands too quickly the second never gets run.

Jeff

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Re: [Ltsp-discuss] Clustering or app servers?

[Robert Lefebvre]

Hi,

I'm not following the advantage of doing this with VMs. I've only dabbled
with them but I'm thinking to add additional processing power to the
network. If possible, I would like to scatter the servers throughout the
school and have them double as workstations for the teachers too. I know
the term "server" is loosely used in LTSP and isn't any special type of
computer. In our network the teachers get the best, strongest machines.
Often they are idle though as they are busy with students.

Am I correct in believing that once the load balancer assigns a request to
a particular server then that traffic would flow back and forth direct from
the client through the switch to the server?

> Do you mean clustering beyond the load balancing LTSP would provide?

Did I answer this above? Or is there some type of load balancing going on
in my single server system now? Like I said, I am thinking of using teacher
work stations as servers at the same time. Or is the idea totally whacked?




On Wed, Sep 4, 2013 at 2:10 PM, Robert Mavrinac wrote:

>  You should be able to install the ltsp packages easily. I put the
> ltsp-root, ltsp-loadbalancer and ltsp-cluster-control on one VM and run a
> number of application server VMs. Just make sure your application servers
> have the same configuration/packages once you start load balancing between
> them. You can pretty much follow the instructions for which packages to
> install on which server and just follow the instructions. Since you haven't
> already installed ltsp cluster packages, you are pretty much working from
> scratch, even with your existing server.
>
> Do you mean clustering beyond the load balancing LTSP would provide?
> Clustering may require a lot of other work, including fencing and share
> disks to support fail-over scenarios and certainly doesn't make sense in an
> LTSP cluster.
>
> Beyond load balancing
>
> On 04/09/13 01:37 PM, Robert Lefebvre wrote:
>
>   We are currently running just one Edubuntu 12.04 server with a 6 core
> AMD processor and 32 GB of ram but I would like to add 1 or more other
> servers.
>
>  I've looked at the ltspcluster.org site and for other tutorials but they
> all sort of start "from scratch".
>
>  What I was wondering was if I can add the LTSP cluster suite (such as the
> load balancer, ltsp-cluster-agent,ltsp-cluster-control etc) to my current
> installation.
>
>  And along with that I am wondering whether two independent servers each
> with edubuntu 12.04 installed can be clustered to work together?
>
>
>  Thanks
>
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>
>
>
>
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>


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Re: [Ltsp-discuss] Remote Desktop For LTSP

[Michael Pope]

Robert,


On Thu 05 Sep 2013 01:21:54 EST, Robert Lefebvre wrote:
> We've had pretty good success using the X2Go program to enable remote
> access to both our server and our clients but I have just found
> Guacamole (http://guac-dev.org/) which looks interesting.
>
> I like it because it doesn't require that a client be installed on the
> remote user's machine.
>
> But, on the other hand, I don't like that it uses VNC which I think is
> slower than the X protocol that X2Go uses (but I could be wrong).
>
> Having just started looking at Guacamole, it sounds like it can use
> any remote server so it might be possible to get the best of both
> worlds and have Guacamole access the x2go remote x server.
>
> Guacamole sounded like a good topic for discussion too.
>

Sounds reallly interesting. I've just switched from using VNC to using 
X2Go and the speed difference is huge. Using VNC was painfully slow 
even with full compression on, however using X2Go over the XDMCP 
protocol it's very fast, almost native speed over a 0.70mbit/sec upload 
link.

I would be interested to see if Guacamole performs the same?

from
Mick


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Re: [Ltsp-discuss] Empty USB sticks on openSUSE 12.3

[Michael Pope]

Christian,

On Thu 05 Sep 2013 06:01:01 EST, Christian Schött wrote:
> Hi,
>
> at our school we run LTSP on openSUSE 12.3 64bit. When you connect an USB
> stick to a client, the device icon appears on the KDE desktop, but the inside
> of the folder in /media/username/ is empty.
>
> I didn't use the Education-Life-DVD, but installed the packages from the
> server:ltsp-repository and from the education repository. I use aoe and it
> worked well with openSUSE 12.2, but with 12.3 it doesn't.
>
> Do I have to put the users into a special group, to let them mount USB-
> devices?
>
> Thanks,
>
> Christian
>

Here is what I've done to get USB mounting working under a debian LTSP 
server, hope this helps.

Make sure package 'ltspfs' is install on the server and 'ltspfsd' on 
the client image.
: sudo apt-get install ltspfs
: ltsp-chroot -m
: sudo apt-get install ltspfsd

Rebuild image if required.

Set the following in your lts.conf
: MOUNT_LOCAL_MEDIA=True
: LOCALDEV=TRUE

Make sure the user is part of the 'fuse' group on the server
: vim /etc/group

Reboot thin client

Insert a FAT32 USB and navigate to /media/ in your file manager, 
have a look around in there and see if it's mounted. By now it should 
be working.

You will sometimes need to make a link to the following in the users 
file manager
: /media/

If it's a ntfs drive make sure you have the 'ntfs-3g' package installed 
in the chroot.
: apt-get install ntfs-3g

Rebuild image

from
Michael

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Re: [Ltsp-discuss] Remote Desktop For LTSP

[John Hupp]

On 9/4/2013 7:16 PM, Michael Pope wrote:
> Robert,
>
>
> On Thu 05 Sep 2013 01:21:54 EST, Robert Lefebvre wrote:
>> We've had pretty good success using the X2Go program to enable remote
>> access to both our server and our clients but I have just found
>> Guacamole (http://guac-dev.org/) which looks interesting.
>>
>> I like it because it doesn't require that a client be installed on the
>> remote user's machine.
>>
>> But, on the other hand, I don't like that it uses VNC which I think is
>> slower than the X protocol that X2Go uses (but I could be wrong).
>>
>> Having just started looking at Guacamole, it sounds like it can use
>> any remote server so it might be possible to get the best of both
>> worlds and have Guacamole access the x2go remote x server.
>>
>> Guacamole sounded like a good topic for discussion too.
>>
> Sounds reallly interesting. I've just switched from using VNC to using
> X2Go and the speed difference is huge. Using VNC was painfully slow
> even with full compression on, however using X2Go over the XDMCP
> protocol it's very fast, almost native speed over a 0.70mbit/sec upload
> link.
>
> I would be interested to see if Guacamole performs the same?
>
> from
> Mick

I've been using Vino (VNC server) on the LTSP server with 
https://meshcentral.com/.

I'm using it because it's free for both business and personal use, it's 
supported by Intel, client access is simple via a web browser, and it 
also knows how to traverse the router's firewall without setting up 
something like port forwarding.

But it is currently only Alpha software (though it seems stable and 
decently reliable), and I also find it to be slow.  It's also not in my 
distro's (Ubuntu) repositories.

Can anyone say whether X2Go or Guacamole handle firewall traversal so 
easily?

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Re: [Ltsp-discuss] Remote Desktop For LTSP

[Michael Pope]

On Thu 05 Sep 2013 10:35:19 EST, John Hupp wrote:
> On 9/4/2013 7:16 PM, Michael Pope wrote:
>> Robert,
>>
>>
>> On Thu 05 Sep 2013 01:21:54 EST, Robert Lefebvre wrote:
>>> We've had pretty good success using the X2Go program to enable remote
>>> access to both our server and our clients but I have just found
>>> Guacamole (http://guac-dev.org/) which looks interesting.
>>>
>>> I like it because it doesn't require that a client be installed on the
>>> remote user's machine.
>>>
>>> But, on the other hand, I don't like that it uses VNC which I think is
>>> slower than the X protocol that X2Go uses (but I could be wrong).
>>>
>>> Having just started looking at Guacamole, it sounds like it can use
>>> any remote server so it might be possible to get the best of both
>>> worlds and have Guacamole access the x2go remote x server.
>>>
>>> Guacamole sounded like a good topic for discussion too.
>>>
>> Sounds reallly interesting. I've just switched from using VNC to using
>> X2Go and the speed difference is huge. Using VNC was painfully slow
>> even with full compression on, however using X2Go over the XDMCP
>> protocol it's very fast, almost native speed over a 0.70mbit/sec upload
>> link.
>>
>> I would be interested to see if Guacamole performs the same?
>>
>> from
>> Mick
>
> I've been using Vino (VNC server) on the LTSP server with
> https://meshcentral.com/.
>
> I'm using it because it's free for both business and personal use, it's
> supported by Intel, client access is simple via a web browser, and it
> also knows how to traverse the router's firewall without setting up
> something like port forwarding.
>
> But it is currently only Alpha software (though it seems stable and
> decently reliable), and I also find it to be slow.  It's also not in my
> distro's (Ubuntu) repositories.
>
> Can anyone say whether X2Go or Guacamole handle firewall traversal so
> easily?
>

X2Go works over SSH so as long as you have a port open for ssh 
(recommend something other than 22, eg: ) then you can use that one 
port for everything, also you could install fail2ban to stop brute 
force attacks on this port.

from
Mick

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Re: [Ltsp-discuss] problems with lightdm/Xubuntu and LDAP

[Todd O'Bryan]

For posterity, I had to comment out some stuff in /etc/pam.d/lightdm.
In particular, these two lines

#authrequisite   pam_nologin.so
#authsufficient  pam_succeed_if.so user ingroup nopasswdlogin

before @include common-auth seemed to be causing a problem (before I added #'s).


On Tue, Sep 3, 2013 at 8:27 PM, Todd O'Bryan  wrote:
> Thanks for the advice. I'll give it a shot.
>
> On Tue, Sep 3, 2013 at 8:13 PM, Rob Owens  wrote:
>> On Tue, Sep 03, 2013 at 05:13:46PM -0400, Todd O'Bryan wrote:
>>> Hey all,
>>>
>>> Over the summer, I decided to switch to Xfce for a lighter-weight
>>> desktop experience. Unfortunately, I'm having a problem getting it
>>> working, just on my server.
>>>
>>> Local users work fine, and LDAP users work fine using "su" or "ssh",
>>> but when I try to log in at the GUI with a user from the LDAP
>>> directory, the login screen disappears, the desktop wallpaper shows
>>> up, and the system hangs. Apparently, this is a known problem, since I
>>> found:
>>>
>> No idea if this applies to your problem or not, but on Debian I've
>> noticed differences with the way different ldap packages work.
>> Specifically, I have better luck with libnss-ldapd and libpam-ldapd,
>> rather than libnss-ldap and libpam-ldap (no 'd' at the end).
>>
>> I'm pretty sure you can switch between the two without changing config
>> files, so you might want to give that a try to see if it's an LDAP issue
>> rather than an LTSP issue.
>>
>> -Rob
>>
>> --
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>>

--
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tutorial videos with LearnDevNow. Subscribe today and save!
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_
Ltsp-discuss mailing list.   To un-subscribe, or change prefs, goto:
  https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
For additional LTSP help,   try #ltsp channel on irc.freenode.net