IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 26 October 2017 (all times are UTC)
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| 11:36 | <gchaos> Hello again guys, does anyone know how to disable the LTSP disable the mounting home user feature over SSHFS when users log in (default behavior of LTSP) without adding "NFS_HOME=/home" to lts.conf? I want /home to be mounted through ZFS
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| 11:36 | ahh sorry, I wrote wrong, I don't think I was clear, again:
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| 11:37 | Hello again guys, does anyone know how to disable LTSP mounting home user dir feature over SSHFS when users log in (default behavior of LTSP) without adding "NFS_HOME=/home" to lts.conf? I want /home to be mounted through ZFS
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| 11:39 | I just had an idea, if it works, I will let you all know
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| 11:43 | <vagrantc> if the user's homedir already exists, it doesn't try to mount it over sshfs...
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| 11:43 | but how are you mounting ZFS over the network?
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| 11:51 | <gchaos> vagrantc, so, I thought I would be able to mount without NFS, but I guess the best option is to use "sharenfs" ZFS property, so I would still use NFS
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| 11:52 | vagrantc, the main reason I want to use ZFS is because of its "deduplication" feature, what would save a good amount of disk space
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| 11:53 | <alkisg> gchaos: zfs is on the server, so it doesn't matter if you use nfs or sshfs to access it
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| 11:53 | The deduplication happens on the server, not on the network..
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| 11:53 | <gchaos> and I wasn't sure if it would work via NFS, I am goint to test and report the result
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| 11:53 | yes alkisg, it seems so
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| 11:53 | <alkisg> So you can use zfs + the default sshfs just fine
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| 11:53 | <gchaos> alkisg, you are right
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| 12:09 | <gchaos> yep, it just worked like a charm :D I just had to enable ZFS sharenfs and dedup features :D
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| 15:35 | <fiesh> alkisg: also, I was too early with saying nfs4 made things better -- it sucks just as much. I have no idea why nfs is causing so much trouble, I also get tons of "testing state ID with incorrect client ID" in dmesg... it appears the current nfs implementation in linux is just not really stable
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| 15:49 | <bcg> I have few hundreds of ltsp terminals using nfs (v4.1 or 4.2, don't remember) for both root (ro) and home (rw) mounts. It's very stable for me.
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| 16:22 | <gchaos> I'm also using nfs4 for rootfs and home in my fat-clients, and haven't got any problem so far
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| 16:30 | <alkisg> bcg: how are you booting over nfs ro? Stock ltsp is using the kernel's overlayfs, which is reported to be unreliable
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| 16:30 | gchaos: same ^
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| 16:31 | Are you using some custom implementation using bind-mouns or dm mapper or something else?
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| 19:11 | <bcg> alkisg: bind-mounts, yes. https://git.launchpad.net/~bcgss/ltsp/+git/ltsp-rhel7/commit/?id=c0851f1afe3f587b0ab39c23484bc6aa0d08327b
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| 19:12 | i want to rework it for nbd someday.
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| 19:13 | <alkisg> bcg, yeah we removed bind-mounts support from ltsp...
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| 19:13 | <bcg> redhat branch was so outdated when I started that I'm slowly catching up with debian etc.
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| 19:14 | <alkisg> although I think that's unionfs per directory, not bind-mounts per file
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| 19:15 | bind mounts in ltsp had to maintain a list of all the writeable files, which was error-prone
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| 19:15 | <bcg> yes:
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| 19:15 | +# unionfs-mount writable directories
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| 19:15 | +for dir in /etc /var /root; do
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| 19:15 | ...
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| 19:15 | +# tmpfs-mount other directories. /home should be added to lts.conf as FSTAB_1 line.
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| 19:16 | +for dir in /media /mnt; do
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| 19:30 | <alkisg> writeable directories are much more manageable than dozens of writeable files, although unionfs isn't in-kernel like overlayfs
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| 19:31 | Aufs over NFS works in Debian as well, yet it's not in-kernel either
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| 19:33 | <bcg> I tried with overlayfs first but that didn't work, just deadlocked.
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| 19:34 | I'll retry later. We'll see.
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