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tenspd1370
Tux's lil' helper
Joined: 14 Dec 2017
Posts: 119
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 Posted: Thu Oct 18, 2018 11:35 pm Post subject: zfs / nfs / fstab - bind mount occurs to early [solved] |
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Hi all -
I have my root file system on a SSD, and my home data in a zfs pool. I need to share my home directory over nfs. I have nfs configured right as I can mount my home directory on a client device. So, the directory structure looks like this:
| Code: | /home (SSD)
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|/<user> (mounted from ZFS import rpool/HOME/<user>, mountpoint is set as /home/<user>)
/export
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|/home
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|/<user>
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| Code: |
fstab
PARTLABEL=boot /boot vfat noauto,noatime 1 2
PARTLABEL=rootfs / ext4 noatime 0 1
PARTLABEL=swap none swap sw 0 0
/dev/cdrom /mnt/cdrom auto noauto,ro 0 0
/home /export/home none rw,bind 0 0
/home/<user> /export/home/<user> none rw,bind 0 0
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(Sorry I couldn't get the spacing right....)
| Code: |
exports
/export *(rw,async,fsid=0,insecure,no_root_squash)
/export/home *(rw,async,nohide,insecure,no_root_squash)
/export/home/<user> *(rw,async,nohide,insecure,no_root_squash)
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(I know it is open to the world, when I figure this out, I will lock it back down)
What seems to happen is the bind mount of my user directory happens before zfs mounts it, so it appears empty in the /exports directory. I verified this by creating a file on the client and having it show up in /export/home/<user>. After I remove it and redo the bind moutn and restart nfs on the server and client it then is correct - /export/home/<user> mirrors /home/<user>, and /home/<user> on the client is correct.
How can I ensure that zfs has run and mounted /home/<user> on the server before the /export/home/<user> bind mount is done?
Thanks!
[Moderator edit: added [code] tags to preserve output layout. -Hu]
Last edited by tenspd1370 on Wed Oct 24, 2018 3:51 pm; edited 1 time in total |
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mv
Watchman
Joined: 20 Apr 2005
Posts: 6747
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| Posted: Fri Oct 19, 2018 4:02 am Post subject: |
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Do you use openrc or systemd?
In case of openrc (mount -a), the mounting should happen in order of the fstab file.
In case of systemd, the mounting can happen in random order unless you write .mount units with corresponding dependencies. |
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tenspd1370
Tux's lil' helper
Joined: 14 Dec 2017
Posts: 119
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| Posted: Fri Oct 19, 2018 6:02 am Post subject: |
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| I use openrc. Another thing I stumbled onto after I posted this was that I may need the 'crossmnt' option on the root of my exports (/export in this case). I'll give that a try when I get back to work, particularly since I should be following the order specified in my fstab. |
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tenspd1370
Tux's lil' helper
Joined: 14 Dec 2017
Posts: 119
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| Posted: Fri Oct 19, 2018 3:31 pm Post subject: |
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| Hmm - crossmnt doesn't seem to be the problem. When I reboot and check /exports/home/<user> on the server, it is empty. When I unmount it and remount it, it mirrors /home/<user> on the server. Somehow zfs and bindmount isn't playing nicely together.... |
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tenspd1370
Tux's lil' helper
Joined: 14 Dec 2017
Posts: 119
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| Posted: Fri Oct 19, 2018 3:48 pm Post subject: |
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I think what did it was adding
| Code: |
rc_need="zfs-mount"
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to /etc/conf.d/localmount
That seems to make it work. I hope that if his is wrong, someone will let me know. I am still trying to research and understand exactly the order things get mounted in. I understand that the order is what is listed in fstab, but even my fstab lists '/boot' before '/', so that may be an oversimplification....?
Thanks! |
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