IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 7 October 2016   (all times are UTC)

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13:27
<Vlad__>
hello, i'm trying to set up LTSP with NFS on Ubuntu 16.04 (it uses NBD by default)
13:27
i've added to /etc/exports:
13:28
opt/ltsp/i386 *(ro,no_root_squash,async,no_subtree_check)
13:29
now there's some strange behaviour: the client boots, but all system files are not writeable by root with permission denied error
13:29
however they all have 644 permission and owned by root
13:29
so LTSP cannot completely set up the system
13:29
e.g. /etc/resolv.conf is empty because /etc/resolvconf/resolv.conf.d/base is not writeable
13:30
<razielle_tzu>
the ro option has caused it to be mounted read only, change it to rw
13:31
<Vlad__>
doesn't LTSP use aufs for changes to FS in memory?
13:31
with NBD it works ok
13:32
<razielle_tzu>
hmm
13:33
did you restart the nfs-kernel-server?
13:33
<Vlad__>
yes
13:33
<razielle_tzu>
i don't know then, if everything is right it should be working
13:34
<Vlad__>
i've tried NFS in Debian Jessie where it is used by default and it worked
13:34
<||cw>
my debian nfs has ro, so that's correct
13:34
<Vlad__>
but in Ubuntu 16.04 it doesn't
13:34
<||cw>
I haven't tried it on ubuntu yet
13:35
<razielle_tzu>
ubuntu doesn't use nfs by default so it might be a little tricky getting it working
13:36
https://help.ubuntu.com/community/UbuntuLTSP/LTSPWithoutNFS < this has some info on reverting though
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13:53
<alkisg_web>
Vlad__: overlayfs doesn't work correctly in new kernels over nfs, so use nbd instead
13:53
Or, wait for the newest kernel that will fix the issue
13:53
I think it's in debian testing
13:53
Why do you want nfs instead of nbd?
13:55
<Vlad__>
for testing; i'm tired of rebuilding image after every small change)
13:55
<alkisg_web>
you can use a raw nbd image
13:55
No need to rebuild it then
13:55
Like, ext4 inside it
13:58
<Vlad__>
sorry, what is raw nbd"
13:58
can you explain pls?
14:13
<alkisg_web>
Vlad__: dd if=/dev/zero of=/opt/ltsp/images/i386.img bs=1m count=1000
14:13
mkfs.ext4 /opt/ltsp/images/i386.img
14:14
mount -o loop i386.img /mnt
14:14
cp -a /opt/ltsp/i386 /mnt
14:14
...etc, so that you make an image that contains the chroot instead of a directory
14:14
Then whenever you want to do changes, you mount it somewhere and chroot to it, and the changes are immediately visible
14:16
It's also possible to use virtualbox to maintain a .raw disk
14:16
And even do snapshots and merge them when you're ready to push them
14:16
<Vlad__>
thanks i'll try it
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