IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 28 November 2010 (all times are UTC)
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| 02:52 | <alkisg> stgraber: about the poweroff -fp and reboot -fp upstart scripts: aren't those just to prevent nbd-client from closing the nbd device?
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| 02:52 | /etc/nbd-client has an option to prevent this in a cross-distro way, without abruptly halting the computer and preventing other services from correctly closing down...
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| 02:53 | If KILLALL="false" and no NBD_DEVICE[0]=xxx devices are set in /etc/nbd-client, then everything works fine out of the box.
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| 02:54 | If we don't want to modify a conffile, we can just use >= /dev/nbd1 instead of nbd0, which is mentioned in that config file
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| 02:54 | (use nbd1 in ltsp, I mean)
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| 03:00 | We could probably tell Wouter, the nbd maintainer, to not include a NBD_DEVICE[0]=xxx entry in the default configuration file, that would be the best solution afaik
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| 03:01 | OK, filing two bugs for this, one in nbd and one in ltsp...
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| 03:01 | <vagrantc> would even be better to not ship a default configuration file at all for nbd
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| 03:01 | seeing as there's no reasonable default
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| 03:03 | <alkisg> vagrantc: would you like to file a bug in debian nbd, instead of me filing a bug in launchpad about it? It would be more direct...
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| 03:04 | <vagrantc> alkisg: what's the exact situation?
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| 03:04 | alkisg: i didn't catch the entire conversation
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| 03:05 | <alkisg> vagrantc: just what I wrote above, we didn't have a conversiation, but let me rewrite it better (gimme a few minutes)
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| 03:09 | <vagrantc> in fact, it would be nice to get a /etc/nbd-client.d directory or some such
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| 03:09 | <alkisg> dpkg-reconfigure nbd-client states:
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| 03:09 | "When the nbd-client init script is called to stop the nbd-client service, there are two things that can be done: either it can disconnect all nbd-client devices (which are assumed not to be in use), or it can disconnect only those nbd-client devices that it knows about in its config file."
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| 03:09 | The default in /etc/nbd-client is
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| 03:09 | KILLALL="false"
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| 03:09 | which means that the initscript should ignore any unknown nbd-client devices.
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| 03:09 | Unfortunately, in the same example file,
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| 03:09 | NBD_DEVICE[0]=/dev/nbd0
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| 03:09 | is used, so /dev/nbd0 is always killed even if the admin didn't manually specify any nbd connections.
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| 03:09 | That breaks shutdown in LTSP clients, it'd be better if no NBD_DEVICE was declared by default in the configuration file, or even if there was no configuration file at all shipped by default.
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| 03:09 | vagrantc: something like this ^^^ . stgraber tried to work around that problem with upstart scripts, but that breaks the shutdown process.
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| 03:10 | (so poweroff -fp should no longer be needed anywhere)
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| 03:16 | <vagrantc> the sendsigs.omit stuff doesn't handle it? works on debian.
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| 03:17 | <alkisg> vagrantc: which one? The one from nbd-client?
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| 03:18 | That would work only if nbd-client was started as a service
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| 03:18 | But we start it from the initramfs, so it doesn't put the devices in sendsigs.omit
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| 03:19 | I guess if we put "root=/dev/nbd0" in pxelinux.cfg and call "invoke-rc.d nbd-client start" as part of the ltsp client boot process, then it would work
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| 03:20 | vagrantc: ah, you mean the ones from ltsp-init-common? There's no need to duplicate the code afaik, that should be fixed in the nbd-client package
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| 03:20 | (and in the future, we can use the nbd-client initramfs hook for nbd root mounting, it works fine, there's no need to duplicate this code in ltsp_nbd either)
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| 03:21 | <vagrantc> alkisg: gah. irssi froze on me...
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| 03:21 | <alkisg> Oops
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| 03:21 | (11:17:54 AM) alkisg: vagrantc: which one? The one from nbd-client?
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| 03:21 | (11:18:11 AM) alkisg: That would work only if nbd-client was started as a service
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| 03:21 | (11:18:29 AM) alkisg: But we start it from the initramfs, so it doesn't put the devices in sendsigs.omit
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| 03:21 | (11:19:09 AM) alkisg: I guess if we put "root=/dev/nbd0" in pxelinux.cfg and call "invoke-rc.d nbd-client start" as part of the ltsp client boot process, then it would work
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| 03:21 | (11:20:07 AM) alkisg: vagrantc: ah, you mean the ones from ltsp-init-common? There's no need to duplicate the code afaik, that should be fixed in the nbd-client package
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| 03:21 | (11:20:32 AM) alkisg: (and in the future, we can use the nbd-client initramfs hook for nbd root mounting, it works fine, there's no need to duplicate this code in ltsp_nbd either)
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| 03:22 | <vagrantc> anyways, on debian there are several things...
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| 03:22 | <alkisg> Yet another way to fix it would be to add a _netdev_ line in /etc/fstab, the nbd-client initscript ignores those too
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| 03:23 | <vagrantc> echo KILLALL=false >> $ROOT/etc/nbd-client ; echo OMITKILL=/dev/nbd0 >> $ROOT/etc/nbd-client
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| 03:23 | there's an ltsp-build-client plugin that adds those
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| 03:23 | basically works
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| 03:24 | <alkisg> Hmm where? In the debian dir? I don't have those in my chroot...
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| 03:24 | Ah right, in Debian only
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| 03:24 | <vagrantc> right
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| 03:24 | <alkisg> $%^&* :)
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| 03:24 | <vagrantc> well, while not default, sometimes i think debian has better support for NBD than ubuntu sometimes :)
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| 03:24 | <alkisg> We need better sync between debian and ubuntu ltsp...
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| 03:25 | (as in, drop any other nbd stuff that ubuntu has and only keep the debian ones :D)
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| 03:26 | <vagrantc> OMITKILL was added mid 2009
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| 03:26 | same with KILLALL=false
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| 03:26 | <alkisg> vagrantc: unsetting NBD_DEVICE[0] should also work
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| 03:26 | instead of OMITKILL
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| 03:28 | But if Wouter removed NBD_DEVICE[0]=/dev/nbd0 from the default configuration file, then no LTSP workaround would be needed at all
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| 03:29 | <vagrantc> so, the problem is that by default, it kills devices configured there, but there's no sane default configuration?
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| 03:29 | <alkisg> Yes
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| 03:32 | <vagrantc> that seems like a bug worth reporting
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| 03:34 | * alkisg reads at the nbd-client initscript code to find the best, less intrusive solution ... | |
| 03:35 | <vagrantc> alkisg: hm... at least in sid, nbd-client defaults to NBD_DEVICE[0]=
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| 03:35 | <alkisg> vagrantc: I have squeeze here, I don't think the packages are different..?!
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| 03:35 | Ah no wait I have squeeze for the server
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| 03:35 | Was looking at the client chroot, which is an ubuntu one...
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| 03:38 | * vagrantc is happy to hear that alkisg has some debian around | |
| 03:38 | <alkisg> vagrantc: yup, fixed in ubuntu natty too. So OK that would be a bug report worth filing if it wasn't already fixed :D
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| 03:39 | Now to report a bug about the upstart scripts in ubuntu-ltsp...
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| 03:39 | vagrantc: I've a thin client with 128 RAM in my home, I put squeeze / lxde on it, it's much lighter that anything ubuntu-based I found
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| 03:40 | I have it as a print server, scan server, nfs server, movie player for the kids etc, very handy and with a low power consumption
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| 03:40 | ...and now I'm trying to make it an `nbd -c partition` server (for booting 1 single fat client without ltsp) as well ;)
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| 03:41 | The nbd-client package works fine for remote booting, we shouldn't need any nbd* related code in ltsp at all...
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| 03:42 | <vagrantc> indeed it does.
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| 03:42 | at least, i've been using it
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| 03:44 | <alkisg> Urm the squeeze package has "KILLALL=true" though :(
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| 03:44 | *sid
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| 03:45 | <vagrantc> we could seed a debconf default
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| 03:45 | or manually tweak it
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| 03:46 | <alkisg> I think the maintainer would accept code for nbd-client not to shut down network connections for /
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| 03:47 | So maybe the solution should be inside nbd-client, and not related to ltsp at all...
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| 03:47 | <vagrantc> indeed, that would be cleaner
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| 03:47 | <alkisg> Btw, /lib/init/rw/sendsigs.omit.d/nbd-client ==> shouldn't that be in /var/run?
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| 03:48 | <vagrantc> alkisg: there are several different implementations
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| 03:48 | i tried to support as many as i knew about
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| 03:48 | <alkisg> No I meant the code in the nbd-client initscript, not in ltsp
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| 03:49 | <vagrantc> i know that works in debian
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| 03:52 | the /lib/init/rw thing was added a while ago to provide an early place to write stuff (since /var may be on a separate partition).
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| 03:52 | <alkisg> Ah, so it's not obsolete... ok
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| 03:53 | So... I think that when /etc/init.d/nbd-client is invoked when the ltsp clients boot, it should check /proc/cmdline for the root fs, and put that in its omit list
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| 03:54 | Looking if that already works, or if it doesn't, why...
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| 03:55 | <vagrantc> alkisg: were you able to get an aufs mount just using nbd-client's hooks?
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| 03:55 | <alkisg> vagrantc: No i'm using a rw partition for nbd-server
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| 03:55 | I.e. a single fat client with no aufs
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| 03:55 | <vagrantc> ah!
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| 03:56 | * vagrantc did that recently with armhf tests | |
| 03:56 | <vagrantc> since qemu can't be used to emulate the new architecture
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| 04:05 | <alkisg> I think nbd copy on write should also work, without aufs...
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| 04:07 | <vagrantc> wouter said it was pretty slow
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| 04:07 | <alkisg> Ah. Well it shouldn't be, so maybe some patches there would also be welcome... ;)
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| 04:07 | <vagrantc> good patches are generally welcomed :)
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| 05:06 | <alkisg> Reported the nbd-client part of the problem at https://bugs.launchpad.net/ubuntu/+source/nbd/+bug/682328
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| 23:55 | <alkisg> vagrantc: I believe that everything is working out of the box with the natty (and squeeze) nbd-client versions
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| 23:55 | So I think we can drop the poweroff -fp workarouds
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| 23:55 | ...but we
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| 23:56 | ...but we'll need to add "nbdroot=xxx" and "root=/dev/nbd0" in pxelinux.cfg/default, as specified in /usr/share/doc/nbd-client/README.Debian
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| 23:57 | This way all the nbd-related problems (sendsigs, not unmounting on shutdown etc) are handled by nbd itself, we don't need *any* code in ltsp at all for that anymore...
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| 23:57 | vagrantc, stgraber: Any objections on testing + commiting the dropping of poweroff -fp?
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| 23:58 | stgraber: along with the upstart scripts? (neither those are needed anymore, and they break the graceful stopping of other services...)
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