IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 6 August 2015 (all times are UTC)
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| 12:23 | <Hyperbyte> Shoeb, hi
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| 12:23 | !ask
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| 12:23 | <ltsp> ask: Don't ask to ask a question, simply ask it, and if someone knows the answer, they'll respond. Please hang around for at least a full hour after asking a question, as not everybody constantly monitors the channel.
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| 12:23 | <Hyperbyte> :-)
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| 12:49 | <zamba> anyone used raspberry pi as a thin client?
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| 12:57 | <gvy> zama, yandex search suggests http://cascadia.debian.net/~vagrant/rpi-ltsp-howto.txt as the first result
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| 13:19 | <zamba> i was more thinking about the performance
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| 13:19 | if it in fact works
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| 13:20 | * gvy would ask the same folks but theoretically should be fine as it's roughly PI..PII | |
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| 13:50 | <work_alkisg> zamba, I think it's OK as a thin client... but, thin clients in general suck, and as a *fat* client pi sucks as well... so imho it's not worth it :)
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| 14:23 | <zamba> alkisg: agreed
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| 14:24 | alkisg: that's my conclusion working with the pis myself.. they work fine headless running a simple task, but if you put a human in front of it, complaints starts coming
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| 16:02 | <alkisg> vagrantc: about https://bugs.launchpad.net/ltsp/+bug/1352038, different /boot partition and ltsp-pnp,
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| 16:02 | I can't find any way to do it properly with the newer overlayfs system, other than running bind-mount *on top* of the cow system,
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| 16:03 | * vagrantc waves from UTC+2 | |
| 16:03 | <vagrantc> my network connection is questionable at best for the moment
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| 16:03 | <alkisg> so for precaution, I can remount it ro
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| 16:03 | Wow, welcome :)
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| 16:03 | Jet lag etc?
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| 16:03 | <vagrantc> yeah, a bit travel-weary
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| 16:04 | alkisg: what's different from how the aufs code handles it?
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| 16:04 | <alkisg> I think in aufs you can tell it the mount path
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| 16:05 | In overlayfs you can't, so even multiple overlays can't solve that problem...
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| 16:05 | <vagrantc> hrm.
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| 16:06 | <alkisg> I sent a simplified question in the overlayfs mailing list: http://blog.gmane.org/gmane.linux.file-systems.union
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| 16:06 | Multiple lower dirs are only available in 4+ kernel, but one cannot specify the path there either
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| 16:06 | <vagrantc> i thought i tested that with debian's overlayfs ... maybe it's ubuntuisms?
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| 16:07 | ah, that would make sense ... when i tested it was with upstream 4.x
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| 16:07 | <alkisg> With the patched overlayfs, in previous ubuntu versions, it works working fine
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| 16:07 | Now I think Ubuntu's using the upstream kernel implementation...
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| 16:07 | <vagrantc> with no custom changes?
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| 16:08 | <alkisg> 4.x doesn't work for me either
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| 16:08 | I didn't look at the sources
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| 16:08 | * vagrantc will try again at some pont | |
| 16:08 | <alkisg> Is mounting the submounts RO on top of the overlay acceptable?
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| 16:09 | It would produce errors if someone tried to e.g. remove things from /boot or /home or whatever other submount he has...
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| 16:09 | <alkisg> But in 99% of the cases it should work fine
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| 16:09 | <vagrantc> i guess it's the best workaround we have...
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| 16:10 | <alkisg> We don't want to prefer aufs when it's available, do we?
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| 16:10 | <vagrantc> so you can't mount a unionfs on top of a unionfs?
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| 16:10 | <alkisg> I can, but it's worthless without submounts
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| 16:10 | <vagrantc> s,unionfs,overlayfs,g
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| 16:10 | <ogra_> union-inception ? :)
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| 16:11 | <alkisg> And if I create a directory structure, and mount the overlay where I want it, e.g. mkdir /fakedir/home and then mount the home partition to /fakedir/home, and then try to use that in an overlay, I won't see the home submount at all
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| 16:11 | * vagrantc smiles | |
| 16:12 | <alkisg> At least, I wasn't able to... maybe someone else needs to take a look there, but personally I could only find the RO bind-mounts workaround
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| 16:13 | Just for the logs, here's what I tried:
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| 16:14 | 1) to create the desired structure with bind-mounts, and then use that as the lower dir. Overlayfs there discards the submounts, so it's unusable
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| 16:14 | 2) to use multiple lowerdirs, as allowed in the 4+ kernel. They don't support specifying paths, so it's unusable.
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| 16:15 | <alkisg> 3) to construct the desired structure incrementally, using overlayfs in each step. This again doesn't work because it doesn't provide for specifying a path.
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| 16:16 | and 4), like (3) but with mkdir/bind-mount before the overlayfs => again unusable because it's like (1)
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| 16:16 | So the only thing I got is (5), use only the lowerdir + overlayfs, and then bind-mount all the submounts as RO
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| 16:16 | <vagrantc> i don't get what you can't mount multiple overlayfs on $mnt/, $mnt/home, $mnt/boot, etc.
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| 16:17 | <alkisg> Are you talking about (3), i.e. overlayfs that has a lowerdir=another overlayfs?
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| 18:15 | <zamba> Updating /srv/tftp directories for chroot: /opt/ltsp/i386
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| 18:15 | error: LTSP client installation ended abnormally
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| 18:16 | ok?
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| 19:13 | no actual error message
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| 19:20 | <Hyperbyte> zamba, sure there's no error a bit higher up?
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| 19:25 | <zamba> Hyperbyte: i'll re-run it.. one sec
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| 19:25 | .. or rather.. maybe not one sec
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| 19:28 | <Hyperbyte> :-)
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| 19:28 | I kinda mean... you pasted the last two lines, but there's probably more information above that -why- it failed
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| 19:29 | Would be more helpful if you had the whole output log, or at least more of the last lines.
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| 19:52 | <zamba> Hyperbyte: can't see anything in the preceeding lines either
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| 19:54 | Hyperbyte: running the command yet again
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| 20:15 | <zamba> Hyperbyte: http://pastebin.com/gXkiCrbq
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| 20:16 | Hyperbyte: can you spot any problems there?
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| 20:58 | <Hyperbyte> zamba, it actually looks like it made it
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| 20:58 | Weird.
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| 20:58 | You could try running ltsp-update-image
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| 20:58 | And then ltsp-update-kernels
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| 20:59 | Oh wait
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| 20:59 | This is probably NFS right?
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| 20:59 | If so then skip the first.
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