IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 7 October 2012 (all times are UTC)
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| 19:01 | <markit> hi alkisg, I've digged a little about KDE and I've found that lnusercache or whatever fails simply because you can't create symlink in sshfs fuse whatever
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| 19:01 | (nor you can among 2 nfs mounts)
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| 19:01 | <alkisg> Can't create symlink?!
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| 19:02 | <markit> seems not
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| 19:02 | I've google a little, also I've tried in the shell
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| 19:02 | of course, I'm not as good as you so I could have made a mistake
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| 19:02 | <alkisg> I've tried in the shell too, of course you can create symlinks with sshfs
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| 19:02 | <markit> I've changed a KDE variable (not sure if I did right, I was the cache be created in .cache while is in .kde now)
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| 19:03 | but is slow like before
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| 19:03 | <alkisg> What's the proper name of "lnusercache"? I can't find anything on google with it.
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| 19:03 | <markit> let me find the proper name
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| 19:03 | I've in kubuntu, man whatever told me what it does
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| 19:04 | lnusertemp
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| 19:04 | "lnusertemp — tool to create KDE resources and symlinks to them"
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| 19:04 | is used in the /usr/bin/startkde
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| 19:04 | in any case I've tried something like
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| 19:04 | marco@ltsp102:~/.kde$ LANG=C ln -s /tmp/kde-marco pluto
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| 19:04 | ln: failed to create symbolic link `pluto': Operation not permitted
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| 19:05 | but now I wonder if /tmp/kde-marco existed
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| 19:06 | <alkisg> It doesn't matter, what matters is if you have ssh_follow_symlinks=true or false
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| 19:06 | So, if the problem is that KDE wants a tmp file per user, why not create it in ~/.cache/kde-tmp instead?
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| 19:06 | Finally, all those MB on login are caused by temp files?
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| 19:06 | It sounds silly...
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| 19:08 | <markit> with ssh_follow_symlinks=true it gives that error
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| 19:08 | I've to set it false and add /var/tmp in the mounted directories
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| 19:08 | I've changed KDEVARTMP to point to .cache
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| 19:09 | <alkisg> ssh_follow_symlinks is false by default for links under ~/home, and true for extra_mounts
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| 19:09 | <markit> maybe I did something wrong, since now it creates under .kde
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| 19:09 | ah!
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| 19:09 | <alkisg> Anyway remind me in a week or so to have a look at kde+ltsp
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| 19:09 | <markit> in any case, even if cache file are created under .kde I've a 600MB issue
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| 19:10 | ok, don't worry, I will :)
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| 19:10 | <alkisg> I'll try ltsp-pnp there, and check fat clients and see how they can bypass the cache problems
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| 19:10 | <markit> I called you because I thought that my "discover" that ln -s failing in sshfs was important, but seems that you think can be done and I did something wrong
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| 19:10 | how is it going with ltsp-pnp?
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| 19:11 | I need Phantomas soon ;P (joking)
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| 19:11 | <alkisg> All work fine so far... sshfs is eating up some CPU, but if the users don't have huge files it's not a big problem
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| 19:11 | The problem with sshfs and symlinks is that when ssh_follow_symlinks is true, then you can create them but you can't delete them afterwards, you can't separate them from real files
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| 19:12 | <markit> so use a more "cpu friendly" encryption could be something to investigate?
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| 19:12 | oh!
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| 19:12 | <alkisg> You'd need to maintain an ssh fork for that, upstream doesn't want to include the NULL cipher (unencrypted)
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| 19:13 | <alkisg> But yeah, some research for lighter encryptions might help there
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| 19:13 | <markit> or going back to NFS?
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| 19:13 | you told me about some troubles only with some brand and model of nics
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| 19:13 | maybe is a driver problem that will be addressed soon
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| 19:13 | <alkisg> Right, but only if teachers do actually report that normal classroom usage is causing too high server cpu usage
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| 19:14 | Atheros had problems with NFS, yes, I don't know if it has been solved in 12.04
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| 19:14 | <markit> I think should become an issue if you have a "mix" environment, some fat and some (older / less powerful) thin
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| 19:14 | <alkisg> It could be worked-around with some mounting options
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| 19:15 | E.g. encrypting 5 MB per user shouldn't be a problem, but 100+ MB would be.
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| 19:15 | I have on my TODO list to check the CPU usage on a real classroom with 20 fat clients... some of these days...
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| 19:16 | <markit> :)
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| 19:16 | well, as soon as I've my children leave the other PC, I will try to collect some data about KDE, I've found a dev that maybe will have a look
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| 19:16 | <alkisg> Cool
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| 19:17 | <markit> so when you will have time for some test, maybe we can already have some "feeling" by them
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| 19:17 | but seems that everyone thinks that is a problem of some other part of kde
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| 19:18 | and no one wants to really understand, not using ltsp themselves
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| 19:18 | maybe I've should have used lxde from the beginning, in schools usually they use programs, not the desktop
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| 19:18 | but most of the programs I know are of kde, so...
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| 19:20 | <alkisg> We don't usually install any kdeedu programs due to all the kde-libs dependencies
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| 19:20 | Only in highschools we have to use kolourpaint and kturtle... and while I hate pulling all the KDE libs, we did include them in the high school live/installation DVDs
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| 19:21 | * alkisg wished kdeedu was qtedu instead :-/ | |
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| 19:33 | <gvy> alkisg, al-qedu? :)
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| 19:40 | <alkisg> :P
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| 20:20 | * highvoltage waves from sherbrooke | |
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