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


Channel log from 23 January 2017   (all times are UTC)

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01:36
<TheProf>
Hello. I'm configuring a new LTSP server on top of Ubuntu 16.04 lts and it has set up perfectly, with both thin and fat clients working great. My only issue is printing under fat. Thin clients print no problem. I have read the documentation online and installed CUPS on the server and in chroot, and added CUPS_SERVER=192.168.67.1 which is my ltsp server, and KEEP_SYSTEM_SERVICES=cups and created a file called client.conf in
01:36
/opt/ltsp/amd64/etc/cups/ and rebuilt the image each time, but I can't get it to print.
01:37
No printer shows up as fat client. I'm looking for guidance as we need printing at the school tomorrow morning and I've been struggling with this for a week.
01:37
Thank you.
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16:43
<kidar>
hi, i want to setup a classroom with 20 terminal and a server and would like help as to what i should get, viz server specs terminal specs etc.
16:48
<quinox>
fat clients or thin clients?
16:49
there's some info on the webs if you google, no idea how accurate they are
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17:10
<ben_nabiy>
kidar: If you are running any modern distro version, the specs on the server would have to jump up quite high if you are planning any type of online stuff including youtube or video applications. Fat clients would reduce the demand on the server.
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17:20
<markus_e92>
Hi all, what's the best (secure) way to mount a home directory from a server? (ltsp fat client)
17:31
<sbalneav>
I use NFS myself.
17:31
<vagrantc>
alkisg: i just tested epoptes with ssvnc, and everything seems to work fine... so should probably get the dependencies in debian fixed asap
17:31
NFSv4 allows for some encryption if you managed to wrap your brain around kerberos?
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17:54
<alkisg>
kidar, are you here? You don't respond to what other people are suggesting...
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17:55
<alkisg>
markus_e92: do you know about the LOCALAPPS_EXTRA_MOUNTS lts.conf directive, which mounts dirs over ssh?
17:56
vagrantc: the xvnc4viewer < version trick that I suggested to Phantomas will work, right?
17:56
So that we get xvnc4viewer in Ubuntu 16.04 even with newer epoptes builds...
17:57
<markus_e92>
alkisg: Ok, I will try this
17:57
<alkisg>
!lts.conf | echo markus_e92:
17:57
<ltsp`>
markus_e92: lts.conf: (#1) http://manpages.ubuntu.com/lts.conf, or (#2) lts.conf manpage is available in the ltsp-docs package
17:58
<alkisg>
LOCAL_APPS_EXTRAMOUNTS string, default unset This parameter enables extra mount points to be mounted on the thin client with sshfs. This require a commas separated list of directory.
18:00
<vagrantc>
alkisg: that only works on new installs, because tigervnc-viewer provides vnc-viewer...
18:00
alkisg: so upgrades will still end up without ssvnc.
18:01
<markus_e92>
alkisg: I tried nfs mounting, but without encryption it is not exactly great
18:01
<vagrantc>
alkisg: i guess we could also put a conflicts on tigervnc-viewer...
18:02
alkisg: in fact, tigervnc-viewer is the only package in debian that provides vnc-viewer at this point
18:03
alkisg: is ssvnc a problem on ubuntu?
18:04
alkisg: the other thing would be to implement different dependencies based on the build OS
18:04
did that for LTSP for some time, worked okish
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18:26
<alkisg>
vagrantc: Depends: xvnc4viewer < 4.2| ssvnc | vnc-viewer
18:27
I didn't understand how it goes
18:27
(08:00:20 μμ) vagrantc: alkisg: that only works on new installs, because tigervnc-viewer provides vnc-viewer...
18:27
On new installs, wouldn't ssvnc get installed?
18:27
On upgrades, xvnc4viewer is there, and can't get upgraded, right?
18:28
<vagrantc>
alkisg: yes, new installs would be fine, but upgrades from jessie would allow the newer version of tigervnc-viewer to be satisfied by "vnc-viewer"
18:28
<alkisg>
vagrantc: but why would tigervnc get installed?
18:28
What would pull it?
18:28
<vagrantc>
alkisg: no, the maintainer of xvnc4viewer uploaded a transitional package that depends on tiggervnc-viewer
18:28
which, honestly, is kind of wrong.
18:28
<alkisg>
But that breaks the < 4.2
18:28
So it will be uninstalled
18:28
And ssvnc would be selected instead
18:28
<vagrantc>
doesn't work like that
18:29
not onm
18:29
not on upgrades
18:29
well, you might get *lucky* and have that work out, but most likely not
18:29
<alkisg>
So the xvnc4viewer transitional package would be installed even though it breaks epoptes?
18:29
<vagrantc>
it doesn't break epoptes
18:29
unless we put a breaks...
18:29
which we could do
18:30
<alkisg>
You're the debian/control wizard :D
18:30
Btw, do we prefer ssvnc or tigervnc with a single assist or monitor active?
18:30
<vagrantc>
but it's kind of wrong, because it doesn't break xvnc4viewer, xvnc4viewer breaks epoptes
18:31
<alkisg>
Remember that ssvnc will pull java...
18:31
<vagrantc>
for the short term, in debian, i'd prefer ssvnc, as it doesn't require new code
18:31
yeah, just filed a bug about java
18:31
<alkisg>
The code for tigervnc is there,
18:31
the only limitation is that only one monitor/assist can run at one time
18:31
<vagrantc>
not in epoptes/master
18:31
<alkisg>
...where did Fotis push it?
18:31
I thought he pushed it in master
18:31
<vagrantc>
i've got a patch
18:32
which i submitted on launchpad, don't see it in master
18:32
<alkisg>
Hm, he told me he'd speak with you to get all this sorted out,
18:32
so anyway, suppose that we just push that code that we're going to push anyway,
18:32
<vagrantc>
i can push it
18:32
<alkisg>
and tigervnc is properly supported with that one limitation,
18:33
<vagrantc>
that one limitation seems pretty ugly, but sure, i guess it could work
18:33
<alkisg>
that we can't have more than 1 monitor/assist active at a time
18:33
With that in mind, would you prefer ssvnc or tiger?
18:33
Because if you prefer tiger, then we don't need to change Depends...
18:33
<vagrantc>
i'll do some more testing
18:33
<alkisg>
He updated a couple of lines to solve the defunct processes issue
18:34
<vagrantc>
there was a one-liner i've pulled into my latest packaging
18:34
yeah, that one
18:34
<alkisg>
OK
18:34
<vagrantc>
and then i just built a package with my tigervnc patches applied
18:34
will see if it works
18:34
<alkisg>
Cool
18:35* alkisg still didn't understand why tigervnc would get installed though :D
18:35
<alkisg>
(08:29:37 μμ) vagrantc: it doesn't break epoptes ==> but can the xvnc4viewer transitional package get installed even if it's > 4.2, contrary to what the Depends line demands?
18:36
Wouldn't apt select the next dependency there, i.e. ssvnc?... even on upgrades?
18:36
<vagrantc>
alkisg: it'
18:36
s not predictible
18:36
<alkisg>
k
18:36
<vagrantc>
alkisg: if you're *just* upgrading epoptes, probably
18:37
alkisg: but if you're upgrading the whole distro, it might decide to upgrade xvnc4viewer first, pull in tigervnc-viewer, which then satisfies epoptes's depends via "vnc-viewer"
18:37
<alkisg>
And then at that time uninstall xvnc4viewer too?
18:37
<vagrantc>
doesn't need to
18:37
<alkisg>
upgrade and uninstall? that sounds dumb...
18:38
Hrm
18:38
<vagrantc>
alkisg: the dependencies only have to be satisfied, they don't say what can't be installed
18:38
that's where breaks comes in, but that's not exactly right either
18:39
<alkisg>
So if I was to do an apt autoremove, xvnc4viewer then would get autoremoved because it's not there for any reason,
18:39
<vagrantc>
right, maybe. :)
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18:42
<vagrantc>
in other news, NBD now hangs the client on Debian stretch with reboot/shutdown...
18:42
<alkisg>
Haha join the club :D
18:42
<vagrantc>
heh /o\
18:42
in addition to the annoying / issue
18:44
alkisg: i'm thinking epoptes shoudl have a versioned dependency on epoptes-client ...
18:45
<alkisg>
vagrantc: why?
18:46
it can work with different versions too, on different computers
18:46
so why would it matter on the same computer?
18:46
<vagrantc>
alkisg: i guess i don't wholly understand what epoptes Depends on epoptes-client
18:47
<alkisg>
mostly for ltsp-pnp...
18:47
so that it's easier to install both of them
18:47
<vagrantc>
so realistically, it should just be a recommends?
18:47
or even a suggests?
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18:48
<vagrantc>
or not even a suggests...
18:49* vagrantc wonders if we've had this discussion before :)
18:53* vagrantc wonders if an epoptes, epoptes-server and epoptes-client package would make sense
18:55
<vagrantc>
heh. lts.conf specified an invalid theme, so i got to see the default "ltsp" theme for the first time in ages :)
19:01* bennabiy sighs...
19:01
<vagrantc>
ok, well, with the poll/exit patch and the tigervnc patch ... epoptes mostly works fine, although i'm guessing the multilisten issue is still a problem
19:01
<bennabiy>
I hate debugging IMAP connections.
19:01
<vagrantc>
when i tried to assist multiple clients, it only worked on the first one
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19:05* vagrantc pushes the tigervnc fixes
19:07
<alkisg>
vagrantc: it doesn't require epoptes restart now though, right? if you want to assist another one later on...
19:07
<vagrantc>
alkisg: right, that one-liner fixed that
19:07
<alkisg>
Nice
19:07
<vagrantc>
alkisg: so it's just assisting/monitoring multiple clients
19:07
how much is that used in practice?
19:07
<alkisg>
Not very much
19:08
<vagrantc>
ok, then i think we have something worth uploading, given the time constraints
19:08
<alkisg>
It's not unreasonable to make a note and tell them that if they really need it, manually install ssvnc
19:08
epoptes-client is a recommends of epoptes, isn't it?
19:08
epoptes-server and epoptes-gui can't be on different computers currently, so they need to be one package
19:09
<vagrantc>
ah, you're right
19:09
it's a recommends
19:10
which is ok, if someone really wants it installed without, they can.
19:11
alkisg: not sure if this is fixed in recent versions of epoptes, but the version in jessie started epoptes-client on the server sessions ...
19:11
<alkisg>
I don't think there were any changes between jessie and stretch on that,
19:11
but I also don't think we started epoptes-client ... ???
19:12
When epoptes-client sees that epoptes is installed, it doesn't start as root,
19:12
<vagrantc>
the .desktop file was present in autostart for some reason
19:12
<alkisg>
and it only starts in the session,
19:12
<vagrantc>
and ate a lot of CPU
19:12
at any rate, it doesn't appear to happen in stretch... so presumably jessie-backports is fine too
19:12
<alkisg>
and then it's a responsibility of the epoptes UI to not show the current epoptes-client that the teacher is running on the same session as the epoptes UI
19:13
...you should have filed a bug report for that! :D
19:13
I don't know about epoptes-client eating a lot of cpu either...
19:14
The only cpu-intensive task is the thumbnail, and it shouldn't be called for the "teacher" epoptes-client session
19:16
kidar, did you want something? It's best to ask in the channel, not in PMs...
19:16
<vagrantc>
alkisg: it was such an old version of epoptes, and i haven't seen it on the newer version, so...
19:16
alkisg: figured it wasn't worth a bug report
19:17
<alkisg>
k
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20:37
<vagrantc>
huh. NBD isn't crea
20:37
crashing anymore
20:42
but it also won't negotiate new connections...
20:45
oh, the file to server was deleted...
20:45* vagrantc feels foolish now
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20:51
<vagrantc>
alkisg: well, pushed a new version of epoptes to Debian...
20:54
meh.
20:54* vagrantc meant to mumble in another channel
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