IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 27 March 2016 (all times are UTC)
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| 07:26 | <alkisg> !learn todo-alkisg as put panic=60 in the kernel cmdline
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| 07:26 | <ltsp> The operation succeeded.
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| 07:26 | <alkisg> !forget todo-alkisg
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| 07:26 | <ltsp> The operation succeeded.
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| 07:26 | <alkisg> !learn alkisg-todo as put panic=60 in the kernel cmdline
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| 07:26 | <ltsp> The operation succeeded.
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| 07:26 | <alkisg> !alkisg-todo
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| 07:26 | <ltsp> alkisg-todo: (#1) support xnbd-proxy for local caching: https://bitbucket.org/hirofuchi/xnbd/wiki/Home#!scenario-2-simple-proxy-server-distributed-copy-on-write, or (#2) Support UEFI, or (#3) support for per-user login commands in lts.conf, or (#4) put panic=60 in the kernel cmdline
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| 16:35 | <alkisg> vagrantc: https://www.kernel.org/doc/Documentation/kernel-parameters.txt ==> panic=60 reboots after 1 minute
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| 16:36 | `echo 60 > /sys/module/kernel/parameters/panic` does that without having to pass it in the cmdline
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| 16:36 | So, how about a new lts.conf option, KERNEL_PANIC=<integer, default 60> ?
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| 16:37 | If it's 0 (the kernel default), then we exit that init-ltsp.d script and do nothing
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| 16:37 | <vagrantc> sounds fine.
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| 16:37 | <alkisg> The idea is that ltsp clients that get kernel panics could maybe reboot instead of just hanging there, and that 1 minute is enough for someone around to read what it says
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| 16:37 | <vagrantc> and possibly useful for other projects i'm working on right now
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| 16:38 | <alkisg> init-ltsp.d/50-kernel-panic is ok as a name?
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| 16:38 | <vagrantc> alkisg: although a default value seems not so great.
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| 16:38 | <alkisg> Ah, you think it should only be active if set by the user in lts.conf?
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| 16:39 | <vagrantc> maybe, or set to a much higher value by default
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| 16:39 | <alkisg> OK, how much higher? 10 minutes? More?
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| 16:39 | <vagrantc> really depends on the use-case
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| 16:40 | e.g. a lab that uses the terminals almost constantly would want it different than a lab which uses the terminals sporadically
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| 16:40 | <alkisg> We can't autodetect that
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| 16:41 | <vagrantc> a location where someone may stay logged in all day but leave for hours at a time would be different
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| 16:41 | alkisg: exactly!
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| 16:41 | i'm not sure there's a reasonable default.
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| 16:41 | <alkisg> I'm not sure it's better for either case not to have a default though
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| 16:41 | <vagrantc> not having a default means it hangs indefinitely, no?
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| 16:41 | <alkisg> I.e. what good would it do to have a hanged client (usually under xorg) without the panic message being displayed for e.g. 1 hour?
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| 16:42 | Usually we don't even see kernel panics because they happen after the clients boot
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| 16:42 | <vagrantc> as opposed to one which silently reboots?
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| 16:42 | <alkisg> One that silently reboots is again accessible, so the sysadmin can access it remotely
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| 16:43 | There's one advantage, vs 0 in the other case
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| 16:43 | I think the panic timeout is only useful in text mode
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| 16:43 | I.e. when the client boots
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| 16:43 | (or in SCREEN_07=shell, ssh etc)
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| 16:44 | I.e. it will allow the person there to read the message, get a photo of the error etc
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| 16:44 | Ah
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| 16:44 | OK, here's an idea, let's set it later on then
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| 16:45 | ...although usually if it panics while the client is booting, it's reproducible
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| 16:45 | So I'm not sure how much it helps if you don't reboot, vs rebooting and being able to remotely change pxelinux.cfg/default or lts.conf and fix the issue that caused the panic without having physical access to the client
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| 16:46 | OK after all that, I vote for a default timeout of 1-10 minutes :)
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| 16:46 | Set at init-ltsp.d, nope, not later on
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