I am arriving here as I would also like to run containers (docker) over
a zpool as the storage backend. In my case, I am running Ubuntu Server
(Focal) on a Pi 3B, I would ideally have root on zfs but with it being a
Pi, I have not done this yet. I have an externally attached USB pool for
real data and have left the OS as it is on the SD card, however, as the
above says, I would like to move more of my systems towards ZFS with
time and use Ubuntu-based distros and containers on a lot of them, where
these can't be run under illumos as VMs.
I have installed docker-rootless on this system, however due to kernel
limitations, it is impossible to mount datasets as non-root on linux
(long-standing issue, I am working on a bug report with details of
options for a workaround and will attach), and using a noverlay over the
top of zfs would be fine for me, as I can snapshot and work with the
higher-level system and back up easily, even if not as fast as native
zfs performance, however, the daemon will not start, and I have fallen
back to the "vfs" driver on my data-root filesystem.
Some googling hasn't indicated what feature(s) would be required in zfs for
overlay to be used on top, docker's documentation doesn't seem to clarify
anything, and searching for the "fstype=1" requirement in xfs, I find from the
manual page for `mkfs.xfs`:
```
ftype=value
This feature allows the inode type to be stored in
the directory structure so that the readdir(3) and
getdents(2) do not need to look up the inode to
determine the inode type.
```
which perhaps is not the issue at hand.
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https://bugs.launchpad.net/bugs/1718761
Title:
It's not possible to use OverlayFS (mount -t overlay) to stack
directories on a ZFS volume
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https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1718761/+subscriptions
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