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


Channel log from 1 August 2014   (all times are UTC)

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01:29
<map7>
Is there a way to configure isc-dhcp on one computer to act as the DHCP server and pass requests to DNSmasq for PXE boot on another computer?
01:37
<bennabiy>
alkisg, vagrantc: Where do we need to put in documentation about lts.conf var LDM_PASSWORD_HASH ?
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02:13
<map7>
I'm now trying my LTSP-PNP setup just using dnsmasq and my thin clients finds the server and downloads the pxelinux.0 but fails to find the /vmlinuz file
02:16
Here is the output in my syslog of the error http://pastie.org/9435669
02:16
it seems to be looking for the vmlinuz file in /var/lib/tftpboot/ltsp/amd64 instead of the root directory of the server (as I'm trying to use LTSP-PNP)
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04:30
<cyberorg>
map7_, tried ltsp-update-kernels?
04:31
<map7_>
cyberorg, yes I have, it does create the vmlinuz & initrd.img in the root directory
04:31
which I think is correct for a ltsp-pnp system
04:32
<cyberorg>
map7_, may be copy those to tftpboot ?
04:32
<map7_>
Yep tried that, but then it cannot find the root. It does get further though
04:32
but I think this is the wrong direction.
04:32
Somehow I have to tell dnsmasq or nbd to look for the vmlinuz & init in the root directory
04:32
<cyberorg>
there should be root img file exported via nbd as well
04:33
<map7_>
/opt/ltsp/images/amd64.img is exported
04:33
both the server & client are 64bit BTW
04:35
<cyberorg>
pastebin your /var/lib/tftpboot/pxelinux.cfg/default
04:36
make sure nbdroot has right server and export name
04:38
<map7_>
http://pastie.org/9435822
04:39
<cyberorg>
map7_, add nbdroot=serverIP:exportname
04:39
in append ... line
04:41
<map7_>
where do I find the export name?
04:42
Found it in /etc/nbd-server/conf.d/ltsp_amd64.conf
04:42
It should be nbdroot=10.1.1.150:/opt/ltsp/images/amd64.img
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04:45
<cyberorg>
map7_, pastebin ltsp_amd64.conf
04:46
<map7_>
http://pastie.org/9435828
04:46
Here is the error I'm getting when PXE booting http://snag.gy/HTG9O.jpg
04:48
<cyberorg>
map7_, nbdroot=10.1.1.150:/opt/ltsp/amd64
04:49
map7_, put vmlinuz and initrd in /var/lib/tftpboot/ltsp/amd64
04:50
<map7_>
/opt/ltsp/amd64 directory does not exist (as I'm trying to do a LTSP-PNP)
04:51
<cyberorg>
map7_, doesn't matter, ltsp_amd64.conf has that as a name of export
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04:52
<cyberorg>
map7_, of change [/opt/ltsp/amd64] to whatever you want and use that in nbdroot=...
04:52
<map7_>
oh I see
04:52
<cyberorg>
but first you need vmlinuz and initrd.img in /var/lib/tftpboot/ltsp/amd64
04:53
<map7_>
ok
04:55
It gets further but now it's complaining about it cannot find the root device
04:56
and drops to busybox
04:57
<cyberorg>
append ro initrd=initrd.img init=/sbin/init-ltsp quiet splash root=/dev/nbd0 nbdroot=10.1.1.150:/opt/ltsp/amd64
04:57
got that?
04:58
<map7_>
ah I've got a typo, hold on
05:00
same problem, gave up waiting for root device
05:00
I'll paste the error
05:01
http://snag.gy/rv3eD.jpg
05:02
<cyberorg>
hmm, /dev/nbd0 is missing, no idea about that, something should have modprobe nbd in initrd
05:04
try without root=/dev/nbd0
05:05
<map7_>
ok, after editing that file do I have to restart any daemon?
05:05
<cyberorg>
no, just reboot client
05:06
<map7_>
ok after a reboot I drop to the BusyBox shell quicker, just after it loads the pxelinux.cfg/default [ok]
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05:06
<cyberorg>
pastebin pxelinux.cfg/default again
05:07
<map7_>
http://pastie.org/9435848
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05:11
<cyberorg>
i am out of ideas, try nbdroot=/opt/ltsp/amd64
05:11
<map7_>
I think it's mainly the fact that I'm doing a LTSP-PNP
05:12
<vagrantc>
ltsp-update-kernels should pull the kernels out of /opt/ltsp/images/*.img
05:12
<map7_>
I've done a few LTSP thin client & LTSP fat client setups before at about 10 different sites, but never a LTSP-PNP
05:13
Just rebooted with that last amendment and that didn't work either
05:13
<cyberorg>
"N.B. for more recent version of ltsp, use nbdroot=/opt/ltsp/i386 instead, i.e. the name of the section in /etc/nbd-server/conf.d/ltsp_i386.conf"
05:13
from https://help.ubuntu.com/community/UbuntuLTSP/ProxyDHCP
05:13
<map7_>
should I put the root=/dev/nbd0 back in?
05:14
<cyberorg>
so try nbdroot=/opt/ltsp/amd64, if that does not work then wait for our guru alkisg to show up :)
05:15
<map7_>
yeah that's what I just tried and it failed again just after it load the pxelinux.cfg/default
05:15
<cyberorg>
i guess the problem could be nbd module is not loaded in initrd so /dev/nbd0 is not available
05:15
<map7_>
it gets further with the 'root=/dev/nbd0' section in, but fails to find root device
05:16
yeah, maybe
05:16
I'm following the notes from https://help.ubuntu.com/community/UbuntuLTSP/ltsp-pnp
05:16
I know that's for Ubuntu 12.04
05:17
and I'm running xubuntu 14.04
05:17
I ran the /usr/share/ltsp/update-kernels before building the image like it says
05:18
<cyberorg>
run it now and see if it puts initrd and vmlinuz in correct place
05:18
<map7_>
should I first remove the vmlinuz & initrd in the /var/lib/tftpboot/ltsp/amd64?
05:19
<cyberorg>
yes
05:19
<map7_>
no it didn't put the files in there
05:20
http://pastie.org/9435868
05:20
<vagrantc>
ltsp-update-kernels puts the files there, /usr/share/ltsp/update-kernels generates the pxe configuratons
05:20
<cyberorg>
strange, do you have normal working 14.04 amd64 ltsp?
05:20
<map7_>
It skipped a few things
05:21
no I don't, I've got mainly 12.04 systems and a debian system at work which does LTSP
05:21
<vagrantc>
i think you'll want to: sudo /usr/share/ltsp/update-kernels ; sudo ltsp-update-image -c / ; sudo ltsp-update-kernels
05:21
<map7_>
no 14.04 yet, this is the first one I'm trying to configure
05:22
<cyberorg>
hi vagrantc :)
05:23
<map7_>
vagrantc, I'll try those commands in that order now, thanks
05:24* vagrantc waves to cyberorg
05:27
<map7_>
vagrantc, after completing those three commands it still does not create the init.img or vmlinuz in the /var/lib/tftpboot/ltsp/amd64
05:28
and when trying to boot my client it bombs out trying to find vmlinuz
05:33
could the problem be related to my dnsmasq setup?
05:34
http://pastie.org/9435893
05:38
<cyberorg>
map7_, what is uname -a ?
05:38
<map7_>
Linux xbmcserver 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
05:39
<vagrantc>
if the files aren't there, dnsmasq can't possibly fix the issue.
05:39
map7_: what do you mean init.img ?
05:40
<map7_>
initrd.img
05:40
<vagrantc>
map7_: ls /opt/ltsp/images/*.img
05:40
<map7_>
Just one file: /opt/ltsp/images/amd64.img
05:41
<vagrantc>
mount -o loop /opt/ltsp/images/amd64.img /mnt
05:41
ls /mnt/boot/vmlinuz*
05:41
<map7_>
no vmlinuz exists there
05:42
Just these files: gpxelinux.0 pxelinux.0 pxelinux.cfg
05:42
<vagrantc>
ok, that's a problem.
05:42
ls /boot/
05:42
df -h /boot
05:43
map7_: your /boot on a separate partition, by chance?
05:43
<map7_>
Yes vmlinuz & initrd do exist in /boot
05:43
/dev/sda2 237M 85M 140M 38% /boot
05:43
Yes it is.
05:44
<vagrantc>
huh.
05:44
<map7_>
I'm also running LVM for the root
05:44
<vagrantc>
had an issue with that in debian, which i fixed for aufs ... but supposedly it wasn't needed with overlayfs used on ubuntu
05:44
<map7_>
ah, so this would break ltsp from copying the files over
05:45
<vagrantc>
map7_: is there anything in /mnt/boot/ ?
05:46
<map7_>
Yes: gpxelinux.0 pxelinux.0 pxelinux.cfg
05:46
it must of got these from /var/lib/tftpboot/ltsp/amd64?
05:46
<vagrantc>
map7_: and those files are also in /boot ?
05:46
no, you've got it backwards.
05:47
<map7_>
yes those files are also in /boot
05:47
ah ok so /var/lib/tftpboot/ltsp/amd64 is made up from the /boot from my amd.img (what I'm seeing currently in /mnt/boot)
05:48
<vagrantc>
so, essentially, /usr/share/ltsp/update-kernels generates those files in /boot, ltsp-update-image -c / should create an image with everything at / (minus some excludes in /etc/ltsp/ltsp-update-image.excludes), and then ltsp-update-kernels should copy the files from the image's /boot to /var/lib/tftpboot/ltsp/
05:49
but for some reason, the files aren't making it to the image
05:50* vagrantc suspects changes to overlayfs that broke compatibility
05:50
<map7_>
ah ok, got it.
05:51
<vagrantc>
or maybe code changes.
05:51
map7_: i bet if you do the same on a server without a separate boot partition it will work fine.
05:52
<map7_>
yeah makes sense
05:53
I'm just having a look at the shell script 'ltsp-update-image' now to see if anything pops out.
05:53
<vagrantc>
although it's unclear how the image contains anything at all under /boot ... maybe this is a red herring.
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05:56
<map7>
vagrantc, Just looking at line: 155 'if [ "aufs" = "$union_type" ]; then' of the ltsp-update-image script
05:56
is this what you were talking about before
06:01
<vagrantc>
yes
06:03
map7: as an experiment .... you could manually copy the vmlinuz*/initrd.img* somewhere, unmount /boot, and copy them into the root dir.
06:03
into the root partition's /boot ...
06:03
andthen run ltsp-update-image -c /
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06:08
<cyberorg>
map7, try using initrd in this http://download.opensuse-education.org/~cyberorg/initrd.tar.xz
06:09
put it as /var/lib/tftpboot/ltsp/amd64/initrd.img
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06:12
<map7>
cyberorg, trying that now
06:13
<cyberorg>
map7, it is working initrd from 14.04 normal ltsp setup
06:16
<map7>
it gets a 'no network interfaces found' error
06:16
most likely due to different ethernet devices?
06:19
<cyberorg>
map7, that is strange, it is initrd from a working ltsp setup, boots fine
06:19
append initrd=ubuntu/initrd.img-generic quiet splash nbd_proxy=false root=/dev/nbd0 nbdroot=10.0.0.140:/opt/ltsp/amd64 init=/sbin/init-ltsp
06:20
that is what is used
06:21
try nbd_proxy=false root=/dev/nbd0 nbdroot=10.1.1.150:/opt/ltsp/amd64
06:22
<map7>
I'm just trying what vagrantc suggested first
06:25
vagrantc, that hack worked
06:25
I mounted my root partition as /mnt, copied over my /boot to /mnt/boot, unmount /mnt, ran ltsp-update-image
06:25
it now boots
06:25
and get this, I've got sound!
06:26
<cyberorg>
nice :)
06:26
may be you should document it somewhere for others
06:26
<map7>
I know that sounds weird but I'm doing this remotely so I'm logged in to a spare computer through X2goclient, loaded up virtualbox configured as PXE boot, which boots off the new server over LTSP and the sound works through all that
06:27
I will, I've been documenting everything I changed today
06:27
as I went through
06:27
I actually want to put this into an ansible build script
06:27
<cyberorg>
you got x2go client working with 14.04? i get black screen
06:28
<map7>
No not with ubuntu 14.04. I'm sitting on a debian 7 machine at work, remotely logged into a Ubuntu 12.04 machine through X2go, then loaded up a Virtualbox image on there and PXE booted off the Ubuntu 14.04 machine
06:29
I cannot believe I can get sound working through all that
06:29
it's nuts!
06:30
Thanks cyberorg & vagrantc for your help
06:30
<cyberorg>
technology is amazing :)
06:30
<map7>
yes it is, I love it.
06:31
I've always been a big fan of LTSP
06:31
I should put these notes on the LTSP wiki
06:33
well this has made my day, I think I'll go a have a beer to celebrate, and finish building the system over the weekend.
06:41
<vagrantc>
map7: note, that's mostly a workaround test
06:41
<map7>
Yeah I know it's a dirty hack at the moment
06:41
<vagrantc>
map7: please file a bug report in ubuntu and/or ltsp
06:41
<map7>
Yep I will, I'm just documenting everything I've done today in my notes
06:41
Should the bug be filed on ltsp-update-image script?
06:43
<vagrantc>
sure
06:43* vagrantc -> sleep
06:43* vagrantc waves
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07:51
<muppis_>
Is therer good guide to follow if I want use RPi as client in 14.04 ?
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09:19
<gbaman>
alkisg: I am using sshfs but having the issue of wrong file permissions
09:19
so other users cant modify the files?
09:19
<alkisg>
gbaman: don't ping specific persons, ask your questions in the channel and wait for any answers...
09:20
<gbaman>
it was you that had suggested it so thought you would be best to ask :)
09:22
<alkisg>
I suggested sshfs? It's the default for ltsp...
09:41
<gbaman>
Am trying to use it as a shared folder between users but the permissions are all wrong on the files with it
09:46
<alkisg>
For read-only folders, linux permissions are fine. For read/write folders and mixed groups, it gets annoying.
09:46
<gbaman>
yeah..
09:46
<alkisg>
We're using bindfs for that
09:46
That's not related at all to ltsp though
09:47
bindfs is for fixed uid/gid and permissions, and then ltsp serves it with its default sshfs
09:47
<gbaman>
i currently have it with a script using inotifywait which changes the permissions, but that is far from optimal
09:48
<alkisg>
We have a service called "shared-folders" that automatically handles read/write shared with bindfs
09:48
bindfs /home/Shared/teachers fuse.bindfs rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other 0 0
09:49
We have a similar entry for each shared group
09:49
One for each student class
09:50
<gbaman>
for Raspi-LTSP it wont be separated by class, just has to have the ability to create as many read only or read/write shared folders as wanted
09:54
says "Too many arguments given"
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09:55
<alkisg>
That's not a command line, it's the line from /proc/mounts
09:55
<gbaman>
ohh
09:55
:)
09:57
which does not exist on the chroot
10:00
which is read only anyway :)
10:09
think i might have got it
10:11
ok, now I am getting permission denied for the folder
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10:18
<gbaman>
ok, so looks like it is mainly working, although the permissions are completely wrong if bindfs is not used..
10:18
aka if I go and check on the server at the folder..
10:21
nope, with bindfs another user does not have editing access
10:21
to files already created
10:22
should I be using a guid other than 0?
10:31
<alkisg>
gbaman: 1000 schools here are using bindfs successfully for read/write shares, I don't have the time to walk you through it, but if you want, google it
10:32
There's a page in the ubuntu wiki about it, it might help you
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15:17
<SMartin_>
Hi All
15:18
I am building a ltsp based environment for a new setup
15:18
The thin clients will be used for LAMP development
15:18
35 thin clients will be setup
15:20
I am using HP Dl380p server with two Xeon E5 2620 v2 and 64GB RAM
15:21
the default applications that will be used are netbeans, firefox, chrome, file manager and SVN
15:21
Will the server be capable enough to handle the load?
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15:23
<SMartin_>
And I will be using Fat-Clients with ubuntu-desktop
15:23
Any suggestion or help is appreciated
15:23
Have any one of you have done this before?
15:25
I have done this in a small setup with 4 fat clients running netbeans, chrome, firefox as remote-apps
15:25
it worked with some bugs
15:25
however i reolved them
15:26
now i am setting up the production environment
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19:07
<cryptrat>
does anyone know where i can find a good indepth tutorial for setting up and coniguring local apps?
19:13
<vagrantc>
not much out there, really.
19:13
ltsp-chroot apt-get install app1 app2
19:13
look at LOCALAPPS* in lts.conf manpage
19:14
always looking for documentation writers :)
19:14
<championofcyrodi>
heh
19:18
<vagrantc>
i think basic localapps support is enabled by default these days
19:18
but the menu support isn't.
19:19
<championofcyrodi>
I think AUFS is a really amazing breakthrough in 'self-documentation'
19:20
<vagrantc>
how's that?
19:20
<championofcyrodi>
i first learned about it via LTSP, but now looking at how Docker uses it, it's really neat.
19:21
every 'change' when building the container is applied as a FS layer. which you can view diffs.
19:21
essentially, the dockerfile breaks down everything needed to document the installation of some software stack on a single filesystem
19:22
thus, i could use the docker file as a guide to install on a traditional OS running on top of the bare metal
19:23
<vagrantc>
that's more docker's use of aufs being self-documentation than aufs inherrently being self-documentation
19:23
<championofcyrodi>
yea, that's true.
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20:04
<Andymeows>
Hello, has anyone ever debugged an issue trying to get the host filesystem mounted with nfsmount? I'm getting repeated errors for "Protocol not supported"
20:05
<vagrantc>
what distro?
20:05
<Andymeows>
host and client are debian. I ended up recompiling the kernel for the chroot
20:07
I need a newer kernel to support newer hardware on the client machine
20:08
<vagrantc>
backports kernel didn't work?
20:08
sounds likely the kernel you built is missing some feature
20:08
<Andymeows>
unfortunately no, I'm actually trying with 3.16, but I might try with a slightly older version
20:10
<vagrantc>
3.16 from experimental will likely work if you have initramfs-tools from backports
20:10
<Andymeows>
yeah, it seems to be something with the nfsmount program in the initramfs
20:11
<vagrantc>
do you have other client hardware that works with ... wheezy? is that what you're running?
20:12
<Andymeows>
yeah, the client hardware does come up with the stock wheezy image, but the video drivers aren't there
20:14
I actually extracted the nfsmount program from the initrd image, and was able to mount the share on the host itself
20:14
`mount` showed a "protocol=3" in the output
20:15
and I used the kernel configuration from the stock wheezy client when compiling this new kernel
20:17
<alkisg>
nfsmount is a klibc tool that can be found there: /usr/lib/klibc/bin/nfsmount
20:18
No need to extract it from the initrd...
20:18* vagrantc still thinks there's something amiss with the custom kernel.
20:19
<Andymeows>
hmm, so it should be identical to the one in the initrd, right?
20:19
<vagrantc>
missing protocols, changed protocol defaults ... there are lots of things that can go awry when taking an old kernel config and applying it to a new kernel version
20:20
<Andymeows>
I see
20:21
especially from 3.2 -> 3.16
20:21
<vagrantc>
i'd try the kernels in backports and/or experimental
20:22
<Andymeows>
ok, I'll give that a shot. Thanks for your help!
20:23
<vagrantc>
only other thing is if nfs-kernel-server isn't running ... but if it was booting with the wheezy kernel... that's not likely it.
20:24
i've seen those sorts of issues with nfsmount when booting with the wrong initrd and s it didn't have the extra modules available
20:24
<Andymeows>
right, it's definitely something with the client
20:25
maybe I can try to get into the initrd shell from the working image, and try to compare what modules are active
20:26
<vagrantc>
break=init to the bootprompt
20:27
<Andymeows>
hmm, I haven't seen a prompt when it boots before
20:27
<vagrantc>
for a one-off, tweak /var/lib/tftpboot/ltsp/*/pxelinux.cfg/default
20:27
<Andymeows>
gotcha
20:27
<vagrantc>
for a one-off, tweak /var/lib/tftpboot/ltsp/*/pxelinux.cfg/*
20:28
it'll get wiped out when ltsp-update-kernels is run, but for testing quick stuff, should be fine
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