Re: Import and Export of Zfs pools
James Allsopp wrote:
> On Thu, 26 Nov 2020 at 12:32, Dan Ritter <dsr@randomstring.org> wrote:
>
> > > - cp -a /var to /tank/var
> > > - Set the mount point on /tank/var to /var
> > > - Remove /var entry from /etc/fstab
> > > - Export the pool
> > > - Reboot
> > >
> > >
> > > And then I should have a ZFS var for VMs and Docker containers when the
> > > main OS imports ZFS for /var.
> >
> > Don't export the pool. Unmount all ZFS mounts before or as part
> > of shutdown..
>
> Ok, got all this to work almost; When the system comes back up, it sees no
> /var directory and tries to fill it. Then the zfs-mount service starts
> later and can't mount over a non-empty directory. I'm out of ideas now.
So you need ZFS to be up earlier. I've never seen anyone use ZFS
for /var without also using it for /, but the procedure should
be basically the same: you need to get everything set up in your
initramfs as though you were going to use a ZFS root, and then
don't.
See
https://openzfs.github.io/openzfs-docs/Getting%20Started/Debian/Debian%20Buster%20Root%20on%20ZFS.html
and zfs-initramfs
-dsr-
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