IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 4 December 2017 (all times are UTC)
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| 08:12 | <alkisg> !client-list
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| 08:12 | <ltsp> client-list: to get a list of all nbd-clients (which sometimes is the same as ltsp clients), run: ss -n | sed -n 's/.*:10809 *\([0-9.]*\):.*/\1/p' | sort -Vu
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| 08:31 | <Hyperbyte> Hi!
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| 08:32 | This morning (I think there might've been some updates this weekend, not sure) all thin clients' MATE sessions can't detect monitors properly, nor can they find USB audio hardware (headsets).
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| 08:32 | I'm thinking this can't be a coincidence. Any ideas? Hints?
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| 08:34 | <alkisg> Hyperbyte: did you somehow boot a different kernel than what is available in the image? E.g. ltsp-update-kernels with old image or something?
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| 08:34 | Test uname -r vs ls /boot in the image
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| 08:35 | <Hyperbyte> I did yes!
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| 08:35 | How on earth did that happen?
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| 08:36 | <alkisg> You should know :)
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| 08:36 | <Hyperbyte> 4.4.0-97 in the client image, running 3.11.0-26
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| 08:36 | I didn't do any updates in ltsp-chroot though.
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| 08:36 | <alkisg> 3.11 is 14.04?
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| 08:36 | And 4.4 is 16.04?
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| 08:36 | That's a big difference there
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| 08:36 | <Hyperbyte> I think so
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| 08:36 | Yeah
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| 08:36 | <alkisg> Wrong server, wrong image?
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| 08:36 | Check your tftp server, why is 3.11 there
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| 08:37 | <Hyperbyte> I was thinking so too, but that doesn't seem likely
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| 08:37 | Let me run kernel updates in the chroot, rebuild and then run ltsp-update-kernels
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| 08:37 | I'll also check that.
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| 08:37 | I don't get why this appears out of nowhere on a regular monday...
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| 08:37 | There were thunderbird and firefox unattended upgrades, I checked.
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| 08:40 | <alkisg> Hyperbyte: start with "is 3.11 in my tftp server?"
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| 08:40 | If yes, that's your fault :D
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| 08:40 | No updates could have done that
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| 08:40 | <Hyperbyte> Well currently it isn't.
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| 08:40 | Maybe ltsp-update-image deleted it?
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| 08:41 | <alkisg> If you ran it after the clients booted, it might.
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| 08:41 | ltsp-update-image calls ltsp-update-kernels, which deletes old kernels
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| 08:41 | But, that would have been deleted ages ago
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| 08:41 | <Hyperbyte> Yes.
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| 08:41 | <alkisg> Are you sure you didn't boot an older server or VM with 14.04 temporarily, at the time the clients were booting?
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| 08:41 | <Hyperbyte> I wonder if there could be some mishap............... oh I got it.
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| 08:43 | Damn, that's a dumb one.
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| 08:43 | Still it's interesting how it messes up like this
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| 08:43 | <alkisg> sysadmin mishaps are usually funny later on :D
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| 08:44 | <Hyperbyte> I run everything for the entire company on one physical virtual server.
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| 08:46 | I wanted a second virtual platform, as fallback and to spread load, but that was too expensive. So instead I took an old server and installed it as a fallback server that only provides basic system.
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| 08:52 | <Hyperbyte> Fallback server pings the big server, if it's down it brings up it's own dhcp service providing fallback terminal server.
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| 08:53 | <alkisg> It's strange that it booted the new image from the old server though. Misconfiguration in the backup server?
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| 08:57 | <Hyperbyte> I edited it's dhcp range this weekend and restarted the dhcp server. Last step of course I shouldn't have done, as that turned on the dhcp server.
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| 08:57 | So two active dhcp servers.
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| 08:58 | Still strange that it always took the tftp image from the fallback and the ltsp image from the primary one.
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| 08:58 | <alkisg> Ah so maybe the first dhcp request came from the old server, and the second dhcp request from the new server, and you're not using ipappend 3
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| 08:58 | first=pxe, second=initramfs
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| 08:58 | That would explain everything
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| 08:58 | <Hyperbyte> Yeah.
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| 08:59 | Well almost everything I think?
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| 08:59 | Why did fallback always win with PXE and primary always win with initramfs?
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| 08:59 | You'd except one dhcp server to be faster, all the time.
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| 08:59 | *expect
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| 09:00 | <alkisg> Maybe it's thinking "oh, you are ip=1.2.3.4 with id="Linux ipconfig"?! But I just gave 1.2.3.4 to id="PXEClient", let me check/ping..."
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| 09:01 | ...and while it checks/pings, the other server has already answered
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| 09:01 | <Hyperbyte> Yeah, that sounds kinda logical.
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| 09:01 | :-)
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| 09:01 | <alkisg> That's why ipappend 3 is good :D
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| 09:01 | <Hyperbyte> Stupid of me to restart the dhcp 2nd server... it's so common to restart a daemon after editing config file that you don't even think. :-D
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| 23:59 | <mightydubcats> hi togehter :-) anybody alive? ;-)
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