mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-27 11:29:36 +03:00
b596585fd9
* Use all caps for document title. * Remove section name as it can be inferred from the section number. * Name "OpenZFS" as the document source. * Bump modification date. While here, fixed trailing whitespace reported by igor. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Ryan Moeller <ryan@iXsystems.com> Closes #10792
249 lines
6.6 KiB
Groff
249 lines
6.6 KiB
Groff
.\"
|
|
.\" Copyright 2018 Antonio Russo <antonio.e.russo@gmail.com>
|
|
.\" Copyright 2019 Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>
|
|
.\" Copyright 2020 InsanePrawn <insane.prawny@gmail.com>
|
|
.\"
|
|
.\" Permission is hereby granted, free of charge, to any person obtaining
|
|
.\" a copy of this software and associated documentation files (the
|
|
.\" "Software"), to deal in the Software without restriction, including
|
|
.\" without limitation the rights to use, copy, modify, merge, publish,
|
|
.\" distribute, sublicense, and/or sell copies of the Software, and to
|
|
.\" permit persons to whom the Software is furnished to do so, subject to
|
|
.\" the following conditions:
|
|
.\"
|
|
.\" The above copyright notice and this permission notice shall be
|
|
.\" included in all copies or substantial portions of the Software.
|
|
.\"
|
|
.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
.\" NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
.\" LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
.\" OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
.\" WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
.TH ZFS-MOUNT-GENERATOR 8 "Aug 24, 2020" OpenZFS
|
|
|
|
.SH "NAME"
|
|
zfs\-mount\-generator \- generates systemd mount units for ZFS
|
|
.SH SYNOPSIS
|
|
.B @systemdgeneratordir@/zfs\-mount\-generator
|
|
.sp
|
|
.SH DESCRIPTION
|
|
zfs\-mount\-generator implements the \fBGenerators Specification\fP
|
|
of
|
|
.BR systemd (1),
|
|
and is called during early boot to generate
|
|
.BR systemd.mount (5)
|
|
units for automatically mounted datasets. Mount ordering and dependencies
|
|
are created for all tracked pools (see below).
|
|
|
|
.SS ENCRYPTION KEYS
|
|
If the dataset is an encryption root, a service that loads the associated key (either from file or through a
|
|
.BR systemd\-ask\-password (1)
|
|
prompt) will be created. This service
|
|
. BR RequiresMountsFor
|
|
the path of the key (if file-based) and also copies the mount unit's
|
|
.BR After ,
|
|
.BR Before
|
|
and
|
|
.BR Requires .
|
|
All mount units of encrypted datasets add the key\-load service for their encryption root to their
|
|
.BR Wants
|
|
and
|
|
.BR After .
|
|
The service will not be
|
|
.BR Want ed
|
|
or
|
|
.BR Require d
|
|
by
|
|
.BR local-fs.target
|
|
directly, and so will only be started manually or as a dependency of a started mount unit.
|
|
|
|
.SS UNIT ORDERING AND DEPENDENCIES
|
|
mount unit's
|
|
.BR Before
|
|
\->
|
|
key\-load service (if any)
|
|
\->
|
|
mount unit
|
|
\->
|
|
mount unit's
|
|
.BR After
|
|
|
|
It is worth nothing that when a mount unit is activated, it activates all available mount units for parent paths to its mountpoint, i.e. activating the mount unit for /tmp/foo/1/2/3 automatically activates all available mount units for /tmp, /tmp/foo, /tmp/foo/1, and /tmp/foo/1/2. This is true for any combination of mount units from any sources, not just ZFS.
|
|
|
|
.SS CACHE FILE
|
|
Because ZFS pools may not be available very early in the boot process,
|
|
information on ZFS mountpoints must be stored separately. The output of the command
|
|
.PP
|
|
.RS 4
|
|
zfs list -H -o name,mountpoint,canmount,atime,relatime,devices,exec,readonly,setuid,nbmand,encroot,keylocation,org.openzfs.systemd:requires,org.openzfs.systemd:requires-mounts-for,org.openzfs.systemd:before,org.openzfs.systemd:after,org.openzfs.systemd:wanted-by,org.openzfs.systemd:required-by,org.openzfs.systemd:nofail,org.openzfs.systemd:ignore
|
|
|
|
.RE
|
|
.PP
|
|
for datasets that should be mounted by systemd, should be kept
|
|
separate from the pool, at
|
|
.PP
|
|
.RS 4
|
|
.RI @sysconfdir@/zfs/zfs-list.cache/ POOLNAME
|
|
.
|
|
.RE
|
|
.PP
|
|
The cache file, if writeable, will be kept synchronized with the pool
|
|
state by the ZEDLET
|
|
.PP
|
|
.RS 4
|
|
history_event-zfs-list-cacher.sh .
|
|
.RE
|
|
.PP
|
|
.sp
|
|
.SS PROPERTIES
|
|
The behavior of the generator script can be influenced by the following dataset properties:
|
|
.sp
|
|
.TP 4
|
|
.BR canmount = on | off | noauto
|
|
If a dataset has
|
|
.BR mountpoint
|
|
set and
|
|
.BR canmount
|
|
is not
|
|
.BR off ,
|
|
a mount unit will be generated.
|
|
Additionally, if
|
|
.BR canmount
|
|
is
|
|
.BR on ,
|
|
.BR local-fs.target
|
|
will gain a dependency on the mount unit.
|
|
|
|
This behavior is equal to the
|
|
.BR auto
|
|
and
|
|
.BR noauto
|
|
legacy mount options, see
|
|
.BR systemd.mount (5).
|
|
|
|
Encryption roots always generate a key-load service, even for
|
|
.BR canmount=off .
|
|
.TP 4
|
|
.BR org.openzfs.systemd:requires\-mounts\-for = \fIpath\fR...
|
|
Space\-separated list of mountpoints to require to be mounted for this mount unit
|
|
.TP 4
|
|
.BR org.openzfs.systemd:before = \fIunit\fR...
|
|
The mount unit and associated key\-load service will be ordered before this space\-separated list of units.
|
|
.TP 4
|
|
.BR org.openzfs.systemd:after = \fIunit\fR...
|
|
The mount unit and associated key\-load service will be ordered after this space\-separated list of units.
|
|
.TP 4
|
|
.BR org.openzfs.systemd:wanted\-by = \fIunit\fR...
|
|
Space-separated list of units that will gain a
|
|
.BR Wants
|
|
dependency on this mount unit.
|
|
Setting this property implies
|
|
.BR noauto .
|
|
.TP 4
|
|
.BR org.openzfs.systemd:required\-by = \fIunit\fR...
|
|
Space-separated list of units that will gain a
|
|
.BR Requires
|
|
dependency on this mount unit.
|
|
Setting this property implies
|
|
.BR noauto .
|
|
.TP 4
|
|
.BR org.openzfs.systemd:nofail = unset | on | off
|
|
Toggles between a
|
|
.BR Wants
|
|
and
|
|
.BR Requires
|
|
type of dependency between the mount unit and
|
|
.BR local-fs.target ,
|
|
if
|
|
.BR noauto
|
|
isn't set or implied.
|
|
|
|
.BR on :
|
|
Mount will be
|
|
.BR WantedBy
|
|
local-fs.target
|
|
|
|
.BR off :
|
|
Mount will be
|
|
.BR Before
|
|
and
|
|
.BR RequiredBy
|
|
local-fs.target
|
|
|
|
.BR unset :
|
|
Mount will be
|
|
.BR Before
|
|
and
|
|
.BR WantedBy
|
|
local-fs.target
|
|
.TP 4
|
|
.BR org.openzfs.systemd:ignore = on | off
|
|
If set to
|
|
.BR on ,
|
|
do not generate a mount unit for this dataset.
|
|
|
|
.RE
|
|
See also
|
|
.BR systemd.mount (5)
|
|
|
|
.PP
|
|
.SH EXAMPLE
|
|
To begin, enable tracking for the pool:
|
|
.PP
|
|
.RS 4
|
|
touch
|
|
.RI @sysconfdir@/zfs/zfs-list.cache/ POOLNAME
|
|
.RE
|
|
.PP
|
|
Then, enable the tracking ZEDLET:
|
|
.PP
|
|
.RS 4
|
|
ln -s "@zfsexecdir@/zed.d/history_event-zfs-list-cacher.sh" "@sysconfdir@/zfs/zed.d"
|
|
|
|
systemctl enable zfs-zed.service
|
|
|
|
systemctl restart zfs-zed.service
|
|
.RE
|
|
.PP
|
|
Force the running of the ZEDLET by setting a monitored property, e.g.
|
|
.BR canmount ,
|
|
for at least one dataset in the pool:
|
|
.PP
|
|
.RS 4
|
|
zfs set canmount=on
|
|
.I DATASET
|
|
.RE
|
|
.PP
|
|
This forces an update to the stale cache file.
|
|
|
|
To test the generator output, run
|
|
.PP
|
|
.RS 4
|
|
@systemdgeneratordir@/zfs-mount-generator /tmp/zfs-mount-generator . .
|
|
.RE
|
|
.PP
|
|
This will generate units and dependencies in
|
|
.I /tmp/zfs-mount-generator
|
|
for you to inspect them. The second and third argument are ignored.
|
|
|
|
If you're satisfied with the generated units, instruct systemd to re-run all generators:
|
|
.PP
|
|
.RS 4
|
|
systemctl daemon-reload
|
|
.RE
|
|
.PP
|
|
|
|
.sp
|
|
.SH SEE ALSO
|
|
.BR zfs (5)
|
|
.BR zfs-events (5)
|
|
.BR zed (8)
|
|
.BR zpool (5)
|
|
.BR systemd (1)
|
|
.BR systemd.target (5)
|
|
.BR systemd.special (7)
|
|
.BR systemd.mount (7)
|