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


Channel log from 13 July 2016   (all times are UTC)

00:09
<maldridge>
lazlo: ltsp does use the chroot, but the authentication is done against the server
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00:31
<lazlo>
maldridge, that expains one part of it. However when I log in, I can see the root FS. I can navigate from ./~ to /opt/ltsp/i386 in a terminal or graphical file managr.
00:32
Sorry for the typos. I am eating, be done in a few.
00:33
<maldridge>
yes, that is what is expected, what are you wanting to setup and there may be a better way to do that
00:36
<lazlo>
OK, I had been under the impression that the thin client would be confined to the chroot fs.
00:37
<maldridge>
so the chroot fs is what's used to boot the machine, after that your session actually is sshfs mounted from the ltsp server
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00:39
<lazlo>
Good info thanks! I am doing this because I like learning. I have a little Xeon D-1520 and I wanted a more portable way to run virt-manager from my desktop or laptop. The thin client seems ideal, I just have a lot to learn about sercuing it.
00:40
ANd about Configuration.
00:40
<maldridge>
lazlo: learning is a great goal, however you may with to look for other solutions, ltsp was designed for running large numbers of machines from a single powerful one, it sounds like you're wanting to do something closer to a "personal cloud"
00:43
<lazlo>
Well, in a way. It's just that tunneling X via ssh (putty) is a bit clunky and I have always wanted to learn about LTSP.
00:43
I am sure there are much better ways to do it, I just know them yet.
00:44
<maldridge>
fair, one of the things that ltsp uses tangentially that you may wish to look into is x2go, which is a solution for remote X desktops
00:46
<lazlo>
I'm reading the wiki now.
00:55
maldridge, x2go does seem to be a nice package. I'll check it out later tonight after I make an new lv and clone my base-vm fs onto it.
00:57
Now that I now I was setting up LTSP correctly to begain with I feel a lot better about moving on to another project.
00:57
Know that I *know...
00:58
lol, too many typos
01:00
Anyway, thanks for you help and have a good night!
01:00
<maldridge>
no problem, good luck with your endeavors!
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12:19
<tarzeau>
is anyone running an ltsp server on ubuntu 16.04? with debian i386 chroot?
12:20
what is the AOE option for in pxelinux.cfg/default ?
12:51
<julienfayad>
Hello there, any way to get a log of user logins on ltsp FAT clients ?
12:54
tarzeau AOE seem to stand for ATA over ethernet
12:54
it’s a protocol to bind a remote filesystem to your local machine
12:54
by default ltsp uses NBD
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12:55
<tarzeau>
i see, no, i want NBD, and i figured the udpate-kernels nbd stuff is in the chroot... retrying...
12:55
<julienfayad>
do you need to change this configuration ?
12:55
<tarzeau>
we've got two ltsp servers running ubuntu 12.04 lts and want to migrate to 16.04
12:55
we're using get_hosts for the ldm load balancing
12:55
<julienfayad>
well I’m using a 16.04 LTSP server
12:55
<tarzeau>
i can't get my client to boot. with 32-bit clients?
12:55
<julienfayad>
but following ltsp-pnp approach (so I have no chroot not)
12:56
<tarzeau>
i can't use pnp, since our clients only run X and are 32-bit only
12:56
and since ubuntu 16.04 destroyed 32bit with pae
12:56
<julienfayad>
well when you say they don’t boot you mean it stops at the pxe boot step in the bios ?
12:56
<tarzeau>
no they get the kernel and initrd
12:57
and then i get: mount: mounting /dev/nbd0 on /root failed: no such file or directory
12:57
and a page full of other errors
12:57
target file system doesn't have requested /sbin/init-ltsp
12:58
but the target DOES have /sbin/init-ltsp
12:58
<julienfayad>
well when I initially tried to use the chroot approach I was also facing issues (and the /dev/nbd0 error seems familiar)
12:59
I was suspecting missing drivers or packages on the chroot but I never fixed it as someone here exposed to me the pnp approach which was great for me
12:59
<tarzeau>
and you're all running 64bit?
12:59
<julienfayad>
when i was facing those errors I was using an ubuntu server image and installed GUI in the chroot only
12:59
yeah all 64
13:00
the oldest machine I have support 64 bits
13:00
so it’s fine with me
13:00
in your case it might not be possible
13:00
<tarzeau>
i don't want to buy 100 new clients just for them to run only an x server
13:00
so i'll rather try to build an ltsp chroot using ubuntu 16.04 with self-built 32-bit kernels
13:00
it's not the age, but the design (very small, and zotac and alix machines actually)
13:00
and no active cooling
13:01
<julienfayad>
makes sense, well I was in another situation so could easily get the ltsp-pnp working
13:02
so I didn’t really fixed the issues I was having with chroot
13:02
quick question, are you getting the exact same error on clients with different hardware ?
13:02
(back then I remember not all clients were showing the exact same errors)
13:02
<tarzeau>
yes same problem
13:04
<julienfayad>
have you enable some logs: https://help.ubuntu.com/community/UbuntuLTSP/ClientTroubleshooting
13:05
<tarzeau>
it doesn't even get that far. the kernel is sent, however stops booting
13:05
so i'm building an ubuntu chroot now
13:06
oh wait, they're not supporting 32 bit anymore
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13:07
<tarzeau>
there are 32-bit images though, so let me just try
13:07
<julienfayad>
where did you get that info from ?
13:07
<tarzeau>
they don't have 32-bit kernels anymore, well not the pae ones
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13:24
<tarzeau>
of course it wouldn't just work...
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13:31
<julienfayad>
yeah it would have been too good to be true :-)
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14:52
<julienfayad>
Ok, something I’m not wrapping my head around
14:52
I’m in a root shell on one ltsp client
14:52
I issue the “ps ax | grep rpc” to see if this service is up and running
14:52
it return nothing
14:53
I launch it by hand: “/usr/sbin/rpc.gssd -vvv”
14:53
I ps ax again and it still won’t show
14:53
this worked quite well on the ltsp server
14:53
it is a fat client and I use ltsp-pnp
14:54
it’s as if ps is ‘broken’ on LTSP clients… ?
14:59
I think it’s a ps issue because I can see logs related to rpc.gssd in the syslog file
15:21
on another side, it seems LTPS clients don’t have the same folder structure as the server… for instance the /run/rpc/pipefs directory is missing on LTSP clients
15:21
and that is required by rpc.gssd to mount a kerberized drive
15:21
any idea what might be causing that ?
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17:42
<julienfayad>
ok it seems it’s an issue with rpcbind which is missing from the LTSP client
17:42
are these modules removed from LTSP clients at boot ?
17:45
<vagrantc>
kernel module?
17:45
or installed package?
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17:55
<julienfayad>
well I’m not so sure
17:56
how could I know if rpcbind is a kernel module or part of a package ?
17:57
<vagrantc>
dpkg -S rpcbind (if using a debian-derived system)
17:58
<julienfayad>
that’s the output on the working station (the LTSP server): http://paste.ubuntu.com/19292525/
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18:00
<vagrantc>
dpkg -S rm-system-services
18:00
you may want to add KEEP_SYSTEM_SERVICES=rpcbind to lts.conf
18:01
and a handful of other services...
18:01
<julienfayad>
the output of the second dpkg is: ltsp-client-core: /usr/share/ltsp/init-ltsp.d/50-rm-system-services
18:02
<vagrantc>
look at that file, and you'll see a list of services that are disabled by default
18:02
or you'll at least see several lists of services that are disabled based on certain conditions
18:03
<julienfayad>
if ! grep -q nfs /etc/fstab; then
18:03
rm_services="$rm_services $(allowed_services "
18:03
and there I can see rpcbind among others
18:03
all related to NFS
18:04
so basically adding an nfs mount in my /etc/fstab should make all these services available by default
18:04
<vagrantc>
as i said the other day, you'll probably want to add some things to KEEP_SYSTEM_SERVICES
18:04
or that...
18:04
<julienfayad>
without the need to edit the lts.conf
18:04
:-)
18:04
I’ll try that tomorrow and keep you posted but that looks like the fix to my problem
18:04
thanks vagrantc
18:04
vagrantc++
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21:53
<Kamgha>
So i'm at a loss of what my problem could be. I've got my server running, client loads the image fine over PXE network. When I try to login my screen will go black then kick my back out to the login page.
22:47
Anyone have an idea? I've run out of ideas. Able to ssh back into the server from the client fine in a terminal as well.
22:47
<quinox>
try checking the SSH log on the server
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22:47
<quinox>
perhaps a diff. WM (dropdown bottom left, "session")
22:48
we sometimes have LTSP assign existing UIDs to people, which messes up access to their home folders causing like what you describe
22:48
<Kamgha>
checking log on server says it received a disconnect from the IP of the client and disconnected by user
22:49
I've only got failsafe Xterm and default. would I need to install a new WM?
22:49
<quinox>
failsafe xterm should be good
22:49
it uses nothing so it can't break :)
22:50
there might be some other debug option, I'm just an LTSP user
22:50
but stick around, the devs are in here and super helpful
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22:51
<Kamgha>
ok, thanks. Ya doesn't seem to do anything even changing session. I can use the shell with CTRL+ALT+F2 and SSH works fine for all users i try :(
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