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


Channel log from 16 November 2012   (all times are UTC)

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07:34
<jimjimovich>
has anyone experienced terminals not working because of network card errors? some of my terminals randomly throw read errors on the squashfs file system ... I was wondering if it's not a bad network card.
07:40
Anyone have a fix for flash drives on ltsp-pnp thin clients
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17:44
<blakes>
Does anyone have a suggested link or information about how to set up a server so that either 32 or 64 bit thin clients get their appropriate image? I am slowly migrating older i386 machines to newer amd64 boxes.
17:45
<||cw>
blakes: you set the dhcp/PXE to give the right image.
17:45
I don't know if pxelinux.cfg has a way to change default based on client arch, though I'd imagine it does
17:46
<blakes>
I figured that, but I was hoping to find some examples.
17:46
<||cw>
I'd start in the pxelinux docs
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18:07
<alkisg>
blakes: the newest ltsp versions have code that uses ifcpu from pxelinux to autodetect 32/64 bit support
18:07
If you're using debian wheezy or ubuntu 12.10 you could see examples in $TFTP/ltsp/i386/pxelinux.cfg/*
18:08
Or google for "kernel ifcpu64.c32"
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18:20
<blakes>
alksig:using 12.04... but wouldn't "$TFTP/ltsp/i386/pxelinux.cfg/default be too late in the boot process? What I mean is doesn't the amd64 thinclient have to tell the server it wants to download $TFTP/ltsp/amd64/pxelinux.cfg/default? And would that be in the dnsmasq config?
18:21
<||cw>
I'm really not sure why the whole tftp is split up by arch, there's nothing wrong with mixing x86 and x64 in the same pxelinux.cfg
18:27
<alkisg>
blakes: no, it's not too late, pxelinux.0 + pxelinux.cfg is the proper point to decide which kernel to load, the support in ltsp for this has been tested + committed
18:27
+released in debian wheezy and ubuntu 12.10
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18:27
<alkisg>
With dnsmasq you'd have to do that based on the client mac, dnsmasq has no way to detect the client arch
18:28
<blakes>
So does the AMD kernel need to be in the i386 directory... or a symlink?
18:28
<alkisg>
You can even point clients to different chroots with pxelinux cfg
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18:28
<alkisg>
/opt/ltsp/i386, /opt/ltsp/amd64, and similar for tftp
18:29
Just out of curiosity though, why bother with amd64 if you have mixed clients?
18:29
<blakes>
I get it..... so you know of any examples of this configuration? your kernel ifcpu64.c32 search wasn't that helpful
18:29
<alkisg>
The default -pae kernel can access up to 64 Gb RAM...
18:30
I don't know how many of these apply to 12.04, but:
18:30
<blakes>
alkisg: I want to the 64 bit machines to work in a lab where a programming class can use 64bit libraries and so on.
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18:30
<alkisg>
update-kernels.conf: #IFCPU64=true => uncomment
18:31
PXELINUX_DEFAULT=ltsp-ifcpu64-NBD
18:32
...make sure your chroot has /usr/lib/syslinux/ifcpu64.c32,
18:32
And here's the new ltsp update-kernels code:
18:32
label ltsp-ifcpu64-$method
18:32
menu label LTSP, using $method, Autodetect 64-bit, PAE or 32-bit kernels
18:32
kernel ifcpu64.c32
18:32
append ltsp-$method-64 -- ltsp-$method-PAE -- ltsp-$method-32
18:32
Man page is here: http://www.syslinux.org/wiki/index.php/Ifcpu64.c32
18:33
So basically if 12.04 supports that (don't remember), you just edit update-krenels.conf, otherwise you put manual entries
18:34
blakes: if it's for a different lab, I guess it would be good to list the lab MACs in dnsmasq.conf
18:34
<blakes>
:-) thanks TONS!! That sort of makes sense, and can do.
18:34
<alkisg>
So from there you can just send a different boot filename
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18:36
<blakes>
So I guess I had a different understanding of how the tftp boot process works.
18:39
the only update-kernels.conf is in the chroot(s)... so either i need to add it to the server or... wait .... does the thin client decide the kernel AFTER the user logs in?
18:42
<alkisg>
blakes: that's the one... it's a bit hard to explain how that affects /var/lib/tftpboot/ltsp/i386/pxelinux.cfg, but it does
18:42
<wicksey>
We've got 12.04.1 running ltsp really nicely. It's gone very well and is working like a dream across 32 fat clients and 32 thin clients. We bought 32 'identical' machines and using them as fat clients. Most show 1280x960 but a small handful show 1024x768. Weird. Where do I start with that? lspci shows the same output.
18:42
<alkisg>
(first it affects $CHROOT/boot and then the result gets copied to TFTP)
18:43
wicksey: different monitors or connectors? (e.g. dvi vs vga)
18:43
<wicksey>
No. That's the weird thing. 32 identical boxes, monitors and method of connecting (vga into a digital adaptor)
18:44
<alkisg>
wicksey: put /var/log/Xorg.0.log in pastebin, from both cases, working + not
18:44
(client side)
18:45
<wicksey>
Will do. I'll have a look through that log on Monday and post it up if it doesn't reveal anything obvious I can fix. Thanks.
18:48
In other news, I worked around the shutdown fat client hanging bug by editting the source code of ldm and compiling to .deb. I'd never done that before so thanks for the help.
18:49
(I understand it might leave nbd connections open etc. but it's so much better for now.)
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