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


Channel log from 6 April 2014   (all times are UTC)

00:33
<gdi2k_>
ege, if you're still around, LTSP is best suited for the LAN. Try NX-based stuff for WAN. I use X2Go personally and it's easy to set up and works really well over LAN. You can google it
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00:41
<gdi2k_>
*works well over WAN I meant to say
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11:36
<ege>
Hi gdi2k_, thanks for your answer.
11:36
I found a lot NX stuff but that was all really old
11:37
I'll have a look at X2Go
11:45
thanks, looks promising and had a release last year and not only in 2008 like others :)
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19:45
<aruiz>
hello there, I want to decouple the main dhcp/tftp LTSP server from the desktop provider, can I run ldm in one machine and the rest of the services in another one?
19:47
<vagrantc>
the short answer is yes
19:47* aruiz is afraid of the long answer now
19:47
<vagrantc>
on debian/ubuntu you want to install the ldm-server package on the server(s) you want to serve applications
19:48
<aruiz>
vagrantc, how do I tell the clients the server is there?
19:48
<vagrantc>
technically, ldm runs on the thin client :)
19:48
<aruiz>
that's the bit I'm struggling with
19:48
<vagrantc>
aruiz: set LDM_SERVER in lts.conf
19:48
you'll also need to get the ssh keys from the server moved over
19:48
<Hyperbyte>
aruiz, out of curiosity... why do you want this?
19:48* vagrantc has used that sort of setup for ages
19:49
<vagrantc>
with one LTSP server, you can have numerous application servers.
19:49
<aruiz>
Hyperbyte, I want to split network services from the main desktop provider
19:50
<vagrantc>
it also provides some measure of isolation ... the rootfs not being hosted on the same machine as the GUI apps, which have far more security vulnerabilities
19:50
<aruiz>
Hyperbyte, it's not the first time I need to upgrade the desktop system but I don't want to because it may break the whole setup
19:50
so say, I need to chose between the latest LibreOffice and a reliable system
19:50
:-)
19:50
I don't want to make that choice
19:50
so for now I want to put all the network services (CUPS, DHCP, tftpboot, LTSP images) in a LXC container
19:51
it also helps when it comes to backing up the system
19:51
if the system crashes
19:51
I reinstall a vanilla ubuntu, deploy that LXC and everything is working and configured again
19:51
<Hyperbyte>
Right, you want to move nbd too... then it makes more sense.
19:51
<aruiz>
Hyperbyte, yeah
19:51
<Hyperbyte>
I actually use virtual machines for this purpose. :)
19:51
<aruiz>
basically the desktop should only serve... the desktop :-) (and ssh too of course)
19:52
Hyperbyte, I have a Windows VM too, but VMs have a lot of overhead compared to containers
19:52
<vagrantc>
oh yes, i was assuming splitting all the non-desktop stuff to a separate server
19:52
<aruiz>
VirtualBox is not 100% reliable in my experience, and I don't want a hybrid KVM+VBox setup :-)
19:52
<vagrantc>
splitting tftp and rootfs is a pain.
19:53
<aruiz>
vagrantc, na, I basically want everything LTSP in that container, but the desktop
19:53
<vagrantc>
right, that's simple.
19:53
<Hyperbyte>
I disagree actually. With kvm-qemu there's not so much overhead I think. At least I haven't ran into any problems running a full thin client server virtualized.
19:53
<aruiz>
vagrantc, so installing ldm-server and setting LDM_SERVER should do the trick right?
19:53
<Hyperbyte>
Anyway, different discussion... :-)
19:54
<vagrantc>
aruiz: and copying the ssh keys to the LTSP server
19:54
<aruiz>
vagrantc, the public ones?
19:55
<vagrantc>
aruiz: the lazy insecure way is: ltsp-update-sshkeys --export SERVER > /etc/ltsp/ssh_known_hosts.SERVER
19:55
yes, the public keys
19:55
and then ltsp-update-sshkeys (and possibly ltsp-update-image, if you use NBD)
19:56
oh, wait.
19:57
ltsp-update-sshkeys --export /etc/ltsp/ssh_known_hosts.SERVER SERVER
19:57
or you could even leave out --export ...
19:57
i always did it manually
19:58
<aruiz>
so wait... this is the bit I don't understand
19:58
<vagrantc>
aruiz: you need the application server's public ssh host keys
19:58
<aruiz>
I should run ltsp-update-sshkeys on the container (where the ltsp services are, except for the desktop)
19:58
but what do I do on the ldm-server?
19:58
right, but are those root ssh keys?
19:58
<vagrantc>
you veryify that ltsp-update-sshkeys grabbed the right keys
19:59
<aruiz>
or is this run by a particular user?
19:59
<vagrantc>
ssh host keys
19:59
<aruiz>
ah the host keys, gotcha
19:59
<vagrantc>
you'll run it as root, yeah.
19:59
<aruiz>
got it,
19:59
<vagrantc>
it basically uses ssh-keyscan to download the keys from the server
20:04
aruiz: you can manually create them, you just copy the /etc/ssh/ssh_host*.pub into a file, and prepend each line with the server name.
20:07
you'll also need name resolution to work properly, or use "HOSTS_xx=appserver1 192.168.0.5"
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