Commit graph

17 commits

Author SHA1 Message Date
Ricardo M. Correia 4d2317e6eb nixos/zfs: Don't default to git version for kernels >= 3.19
Stable version 0.6.3-1.3 works with kernels 3.19.x.
2015-03-19 19:37:33 +01:00
William A. Kennington III 35e9d3c112 nixos/zfs: Use the git version for kernels unsupported by 0.6.3 2015-02-11 15:11:56 -08:00
William A. Kennington III 0fa4c9d6d3 nixos/zfs: Fix references to zfs packages now that they are split 2015-02-07 15:07:39 -08:00
Ricardo M. Correia e9affb4274 nixos: Add system-wide option to set the hostid
The old boot.spl.hostid option was not working correctly due to an
upstream bug.

Instead, now we will create the /etc/hostid file so that all applications
(including the ZFS kernel modules, ZFS user-space applications and other
unrelated programs) pick-up the same system-wide host id. Note that glibc
(and by extension, the `hostid` program) also respect the host id configured in
/etc/hostid, if it exists.

The hostid option is now mandatory when using ZFS because otherwise, ZFS will
require you to force-import your ZFS pools if you want to use them, which is
undesirable because it disables some of the checks that ZFS does to make sure it
is safe to import a ZFS pool.

The /etc/hostid file must also exist when booting the initrd, before the SPL
kernel module is loaded, so that ZFS picks up the hostid correctly.

The complexity in creating the /etc/hostid file is due to having to
write the host ID as a 32-bit binary value, taking into account the
endianness of the machine, while using only shell commands and/or simple
utilities (to avoid exploding the size of the initrd).
2014-11-12 22:31:49 +01:00
Ricardo M. Correia 12e77fdc3f nixos/zfs: Improve the ZFS boot process
It turns out that the upstream systemd services that import ZFS pools contain
serious bugs. The first major problem is that importing pools fails if there
are no pools to import. The second major problem is that if a pool ends up in
/etc/zfs/zpool.cache but it disappears from the system (e.g. if you
reboot but during the reboot you unplug your ZFS-formatted USB pen drive),
then the import service will always fail and it will be impossible to get rid
of the pool from the cache (unless you manually delete the cache).

Also, the upstream service would always import all available ZFS pools every
boot, which may not be what is desired in some cases.

This commit will solve these problems in the following ways:

1. Ignore /etc/zfs/zpool.cache. This seems to be a major source of
issues, and also does not play well with NixOS's philosophy of
reproducible configurations. Instead, on every boot NixOS will try to import
the set of pools that are specified in its configuration.  This is also the
direction that upstream is moving towards.

2. Instead of trying to import all ZFS pools, only import those that are
actually necessary. NixOS will automatically determine these from the
config.fileSystems.* option. Also, the user can import any additional
pools every boot by adding them to the config.boot.zfs.extraPools
option, but this is only necessary if their filesystems are not
specified in config.fileSystems.*.

3. Added options to configure if ZFS should force-import ZFS pools. This may
currently be necessary, especially if your pools have not been correctly
imported with a proper host id configuration (which is probably true for 99% of
current NixOS ZFS users). Once host id configuration becomes mandatory when
using ZFS in NixOS and we are sure that most users have updated their
configurations and rebooted at least once, we should disable force-import by
default. Probably, this shouldn't be done before the next stable release.

WARNING: This commit may change the order in which your non-ZFS vs ZFS
filesystems are mounted.  To avoid this problem (now or in the future)
it is recommended that you set the 'mountpoint' property of your ZFS
filesystems to 'legacy', and that you manage them using
config.fileSystems, just like any other non-ZFS filesystem is usually
managed in NixOS.
2014-11-12 22:31:49 +01:00
Ricardo M. Correia 3b0fa60a98 zfs: Enable systemd
Also remove custom zfs services from NixOS.  This makes NixOS more aligned with
upstream.

More importantly, it prepares the way for NixOS to use ZED (the ZFS event
daemon). This service will automatically be enabled but it is not possible to
configure it via configuration.nix yet.
2014-11-12 22:31:49 +01:00
William A. Kennington III a5bed86fa4 zfs: zpool-import service must be wanted to start 2014-10-11 01:53:24 -07:00
William A. Kennington III 36614ff3e2 Revert "Revert "Merge pull request #2449 from wkennington/master.grub""
This reverts commit 94205f5f21.

Conflicts:
	nixos/modules/system/boot/loader/grub/install-grub.pl
2014-09-02 09:16:13 -07:00
Michael Raskin 94205f5f21 Revert "Merge pull request #2449 from wkennington/master.grub"
This reverts commit 469f22d717, reversing
changes made to 0078bc5d8f.

Conflicts:
	nixos/modules/installer/tools/nixos-generate-config.pl
	nixos/modules/system/boot/loader/grub/install-grub.pl
	nixos/release.nix
	nixos/tests/installer.nix

I tried to keep apparently-safe code in conflicts.
2014-08-31 12:58:37 +04:00
William A. Kennington III 02ab48d0ee Enable grub zfsSupport if zfs is built into the initrd 2014-08-28 13:35:34 -07:00
Ricardo M. Correia 419a71e1e5 spl, zfs: Add git versions, based on recent commits
Upstream has not been tagging new versions for a long time, but we need
compatibility with newer kernels. The 0.6.2 versions already have a bunch of
backported compatibility patches, but 3.14 kernels need even more.

Also, the git versions have fixed a bunch of crashes and other bugs, so perhaps
we should just bite the bullet and just use recent git versions (as sometimes
upstream recommends, when people run into bugs).

This adds a new "boot.zfs.useGit" boolean option, so that a user can
easily opt into using the git versions.
2014-04-23 01:42:52 +02:00
Eelco Dolstra 29027fd1e1 Rewrite ‘with pkgs.lib’ -> ‘with lib’
Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.
2014-04-14 16:26:48 +02:00
Ricardo M. Correia bb188bbba7 nixos: Add ZFS auto-snapshotting module 2014-03-15 01:56:42 +01:00
Ricardo M. Correia 02e2431661 zfs: Don't look for devices only in /dev
If we don't give out a directory to 'zpool import', it will use libblkid
to automatically find all existing ZFS devices.
2014-03-04 12:58:11 +01:00
Bjørn Forsman dc352536a8 nixos: capitalize a bunch of service descriptions
(systemd service descriptions that is, not service descriptions in "man
configuration.nix".)

Capitalizing each word in the description seems to be the accepted
standard.

Also shorten these descriptions:
 * "Munin node, the agent process" => "Munin Node"
 * "Planet Venus, an awesome ‘river of news’ feed reader" => "Planet Venus Feed Reader"
2013-11-09 20:45:50 +01:00
William A. Kennington III c2f35087d2 Add ZFS dependencies to the initrd so that the zpool command works.
Remove unneeded zfs mount, since zpool automatically mounts everything.

Close #1128.
2013-10-30 16:17:44 +02:00
Eelco Dolstra 5c1f8cbc70 Move all of NixOS to nixos/ in preparation of the repository merge 2013-10-10 13:28:20 +02:00
Renamed from modules/tasks/filesystems/zfs.nix (Browse further)