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Ubuntu 22.04 / Debian: Deprecate zsys

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Ubuntu almost removed support for ZFS from the installer, and zsys is
on life support:
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1966773
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1968150

I plan to rework the Ubuntu 22.04 instructions to be closer to those for
Debian Buster.  This will be straightforward, but I need to actually test
the resulting instructions before pushing that change.

Signed-off-by: Richard Laager <rlaager@wiktel.com>
This commit is contained in:
Richard Laager
2022-04-29 16:44:23 -05:00
parent d8e15645f6
commit 8105d010fe
3 changed files with 14 additions and 44 deletions
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6
docs/Getting Started/Debian/Debian Bullseye Root on ZFS.rst
View File

@@ -425,8 +425,10 @@ Step 3: System Installation
On Solaris systems, the root filesystem is cloned and the suffix is
incremented for major system changes through ``pkg image-update`` or
``beadm``. Similar functionality has been implemented in Ubuntu 20.04 with
the ``zsys`` tool, though its dataset layout is more complicated. Even
``beadm``. Similar functionality was implemented in Ubuntu with the
``zsys`` tool, though its dataset layout is more complicated, and ``zsys``
`is on life support
<https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1968150>`__. Even
without such a tool, the `rpool/ROOT` and `bpool/BOOT` containers can still
be used for manually created clones. That said, this HOWTO assumes a single
filesystem for ``/boot`` for simplicity.

6
docs/Getting Started/Debian/Debian Buster Root on ZFS.rst
View File

@@ -435,8 +435,10 @@ Step 3: System Installation
On Solaris systems, the root filesystem is cloned and the suffix is
incremented for major system changes through ``pkg image-update`` or
``beadm``. Similar functionality has been implemented in Ubuntu 20.04 with
the ``zsys`` tool, though its dataset layout is more complicated. Even
``beadm``. Similar functionality was implemented in Ubuntu with the
``zsys`` tool, though its dataset layout is more complicated, and ``zsys``
`is on life support
<https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1968150>`__. Even
without such a tool, the `rpool/ROOT` and `bpool/BOOT` containers can still
be used for manually created clones. That said, this HOWTO assumes a single
filesystem for ``/boot`` for simplicity.

46
docs/Getting Started/Ubuntu/Ubuntu 22.04 Root on ZFS.rst
View File

@@ -12,46 +12,12 @@ Overview
Ubuntu Installer
~~~~~~~~~~~~~~~~
The Ubuntu installer has `support for root-on-ZFS
<https://arstechnica.com/gadgets/2020/03/ubuntu-20-04s-zsys-adds-zfs-snapshots-to-package-management/>`__.
This HOWTO produces nearly identical results as the Ubuntu installer because of
`bidirectional collaboration
<https://ubuntu.com/blog/enhancing-our-zfs-support-on-ubuntu-19-10-an-introduction>`__.
If you want a single-disk, unencrypted, desktop install, use the installer. It
is far easier and faster than doing everything by hand.
If you want a ZFS native encrypted, desktop install, you can `trivially edit
the installer
<https://linsomniac.gitlab.io/post/2020-04-09-ubuntu-2004-encrypted-zfs/>`__.
The ``-o recordsize=1M`` there is unrelated to encryption; omit that unless
you understand it. Make sure to use a password that is at least 8 characters
or this hack will crash the installer. Additionally, once the system is
installed, you should switch to encrypted swap::
swapon -v
# Note the device, including the partition.
ls -l /dev/disk/by-id/
# Find the by-id name of the disk.
sudo swapoff -a
sudo vi /etc/fstab
# Remove the swap entry.
sudo apt install --yes cryptsetup
# Replace DISK-partN as appropriate from above:
echo swap /dev/disk/by-id/DISK-partN /dev/urandom \
swap,cipher=aes-xts-plain64:sha256,size=512 | sudo tee -a /etc/crypttab
echo /dev/mapper/swap none swap defaults 0 0 | sudo tee -a /etc/fstab
`Hopefully the installer will gain encryption support in
the future
<https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1857398>`__.
If you want to setup a mirror or raidz topology, use LUKS encryption, and/or
install a server (no desktop GUI), use this HOWTO.
The Ubuntu installer still has ZFS support, but `it was almost removed for
22.04 <https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1966773>`__
and `it no longer installs zsys
<https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1968150>`__. At
the moment, this HOWTO still uses zsys, but that will be probably be removed
in the near future.
Raspberry Pi
~~~~~~~~~~~~