Debian Bug report logs - #855801
zfs-mount.service / zfs.target should be WantedBy=local-fs.target, not multi-user.target

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Christopher Martin <chrsmrtn@gmail.com>

To: submit@bugs.debian.org

Subject: zfs-mount.service / zfs.target should be WantedBy=local-fs.target, not multi-user.target

Date: Tue, 21 Feb 2017 12:25:08 -0500

Package: zfsutils-linux
Version: 0.6.5.9-2

Currently, the zfs-mount.service is started through the zfs.target,
which is itself in turn WantedBy=multi-user.target. This happens after
local-fs.target is reached (which is when local file systems are
expected to be mounted). As a result, there is no guarantee that a
daemon or other service, many of which are also started through
multi-user.target, will be able to see ZFS mounts when they launch.
This can cause problems (e.g. a DLNA server that wants to serve files
stored on a ZFS array).

Instead, I would suggest that zfs-mount.service or the zfs.target
(whichever makes most sense) be WantedBy=local-fs.target, thereby
mounting ZFS along with all the other local filesystems. That way,
daemons etc. started later, through multi-user.target, will reliably
be able see the system's ZFS mounts when they launch.

Thanks,

Christopher Martin

Message #10 received at 855801-close@bugs.debian.org (full text, mbox, reply):

From: Aron Xu <aron@debian.org>

To: Christopher Martin <chrsmrtn@gmail.com>, 855801-close@bugs.debian.org

Subject: Re: [Pkg-zfsonlinux-devel] Bug#855801: zfs-mount.service / zfs.target should be WantedBy=local-fs.target, not multi-user.target

Date: Tue, 28 Nov 2017 15:57:32 +0800

Hi,

On Wed, Feb 22, 2017 at 1:25 AM, Christopher Martin <chrsmrtn@gmail.com> wrote:
> Package: zfsutils-linux
> Version: 0.6.5.9-2
>
> Currently, the zfs-mount.service is started through the zfs.target,
> which is itself in turn WantedBy=multi-user.target. This happens after
> local-fs.target is reached (which is when local file systems are
> expected to be mounted). As a result, there is no guarantee that a
> daemon or other service, many of which are also started through
> multi-user.target, will be able to see ZFS mounts when they launch.
> This can cause problems (e.g. a DLNA server that wants to serve files
> stored on a ZFS array).
>
> Instead, I would suggest that zfs-mount.service or the zfs.target
> (whichever makes most sense) be WantedBy=local-fs.target, thereby
> mounting ZFS along with all the other local filesystems. That way,
> daemons etc. started later, through multi-user.target, will reliably
> be able see the system's ZFS mounts when they launch.
>

In zfs-mount.servce:

> [Unit]
> Description=Mount ZFS filesystems
> Documentation=man:zfs(8)
> DefaultDependencies=no
> After=systemd-udev-settle.service
> After=zfs-import-cache.service
> After=zfs-import-scan.service
> After=systemd-remount-fs.service
> Before=local-fs.target

So that it is scheduled to run before local-fs.target is reached.

Regards,
Aron

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