IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 20 July 2019 (all times are UTC)
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| 14:30 | <alkisg> I'm reading that nfs4 uses a single export tree; now that we're using nfs instead of nbd, would it make sense to put the tree in /srv/nfs/ltsp instead of /srv/ltsp, so that users can use /srv/nfs as the tree base?
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| 14:31 | <vagrantc> oh...
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| 14:31 | that seems ... rather limited
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| 14:31 | if they want it in something other than /srv/nfs ...
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| 14:31 | <alkisg> They propose bind-mounts to put submounts under the tree
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| 14:32 | So some fhs-aware guides use /srv/nfs, other use /exports,
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| 14:32 | and all of them then bind-mount whatever else they need under that tree
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| 14:32 | <vagrantc> huh
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| 14:32 | <alkisg> So one could e.g. bind-mount /home to /srv/nfs/home
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| 14:32 | (instead of /exports/home; no other option)
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| 14:32 | (the bind-mount is necessary)
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| 14:33 | of course our paths are configurable from /etc/ltsp/ltsp.conf; it's about what makes more sense to have as the default
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| 14:34 | <vagrantc> sure
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| 14:35 | NFSv4 requires kerberos and all that, no?
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| 14:35 | <alkisg> (these things take the most time, a looot more than the coding time :D)
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| 14:35 | Well, unencrypted nfs4 works without kerberos
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| 14:35 | AFAIK it's just as safe as nfs3, i.e. not at all
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| 14:36 | And one can have both nfs4 and nfs3 exports in his /etc/exports at the same time
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| 14:36 | <vagrantc> oh, i didn't know nfs4 worked at all without kerberos
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| 14:36 | <alkisg> (our configuration file is /etc/exports.d/ltsp-nfs.exports)
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| 14:36 | I haven't really done my homework though; I did see "mount | grep nfs" reporting nfs4, and I haven't installed kerberos, so I'm guessing my test was ok
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| 14:39 | An additional thing is that I'd like tftp to be accessible over nfs as well; e.g. to fetch lts.conf (now ltsp.img) or to fetch a kernel to update the local copy, when booting without pxe capabilities,...
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| 14:40 | So i'm thinking the kernels dir should be inside the nfs ltsp dir; and we can use a symlink from /srv/tftp to that if needed
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| 14:42 | <vagrantc> or more bind mounts! :)
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| 14:42 | <alkisg> Right
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| 14:42 | And, a great way to expose a VM for netbooting, is to bind-mount /home/alkisg/vm.raw to /srv/ltsp/images/vm.img, and run ltsp-update-kernels vm... more bind mounts there!
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| 14:43 | (as symlinking won't work with nfs)
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| 14:43 | (hardlinking might work, if they're in the same partition)
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| 14:43 | <vagrantc> there used to be issues with bind-mounts and NFS ...
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| 14:43 | <alkisg> crossmnt works fine, afaik
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| 14:43 | <vagrantc> but honestly haven't checked recently, or it required some specific options
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| 14:44 | <alkisg> It requires nohide or better crossmnt on /etc/exports, but I don't know of any other issues than that
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| 14:44 | /srv/ltsp *(ro,async,crossmnt,no_subtree_check,no_root_squash)
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| 14:44 | #/home *(rw,async,no_subtree_check)
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| 14:45 | That's our current defaults
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| 14:57 | Example test: /srv/ltsp *(fsid=0,ro,async,crossmnt,no_subtree_check,no_root_squash)
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| 14:57 | mount localhost:/srv/ltsp /mnt ==> gives nfs3
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| 14:58 | mount localhost:/ /mnt ==> gives nfs4
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| 14:58 | as / is only accessible over nfs4, i.e. the root of the exported tree
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| 14:59 | And of course initramfs-tools and klibc only support nfs3: /usr/lib/klibc/bin/nfsmount 127.0.0.1:/ /mnt ==> access denied
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