xref: /freebsd-src/sys/contrib/openzfs/man/man8/zfs-get.8

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.\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
.\" Copyright 2011 Joshua M. Clulow <josh@sysmgr.org>
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.Dd April 20, 2024
.Dt ZFS-SET 8
.Os
.
.Sh NAME
.Nm zfs-set
.Nd set properties on ZFS datasets
.Sh SYNOPSIS
.Nm zfs
.Cm set
.Op Fl u
.Ar property Ns = Ns Ar value Oo Ar property Ns = Ns Ar value Oc Ns …
.Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot Ns …
.Nm zfs
.Cm get
.Op Fl r Ns | Ns Fl d Ar depth
.Op Fl Hp
.Op Fl j Op Ar --json-int
.Oo Fl o Ar field Ns Oo , Ns Ar field Oc Ns … Oc
.Oo Fl s Ar source Ns Oo , Ns Ar source Oc Ns … Oc
.Oo Fl t Ar type Ns Oo , Ns Ar type Oc Ns … Oc
.Cm all Ns | Ns Ar property Ns Oo , Ns Ar property Oc Ns …
.Oo Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot Ns | Ns Ar bookmark Oc Ns …
.Nm zfs
.Cm inherit
.Op Fl rS
.Ar property Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot Ns …
.
.Sh DESCRIPTION
.Bl -tag -width ""
.It Xo
.Nm zfs
.Cm set
.Op Fl u
.Ar property Ns = Ns Ar value Oo Ar property Ns = Ns Ar value Oc Ns …
.Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot Ns …
.Xc
Only some properties can be edited.
See
.Xr zfsprops 7
for more information on what properties can be set and acceptable
values.
Numeric values can be specified as exact values, or in a human-readable form
with a suffix of
.Sy B , K , M , G , T , P , E , Z
.Po for bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes, exabytes,
or zettabytes, respectively
.Pc .
User properties can be set on snapshots.
For more information, see the
.Em User Properties
section of
.Xr zfsprops 7 .
.Bl -tag -width "-u"
.It Fl u
Update mountpoint, sharenfs, sharesmb property but do not mount or share the
dataset.
.El
.It Xo
.Nm zfs
.Cm get
.Op Fl r Ns | Ns Fl d Ar depth
.Op Fl Hp
.Op Fl j Op Ar --json-int
.Oo Fl o Ar field Ns Oo , Ns Ar field Oc Ns … Oc
.Oo Fl s Ar source Ns Oo , Ns Ar source Oc Ns … Oc
.Oo Fl t Ar type Ns Oo , Ns Ar type Oc Ns … Oc
.Cm all Ns | Ns Ar property Ns Oo , Ns Ar property Oc Ns …
.Oo Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot Ns | Ns Ar bookmark Oc Ns …
.Xc
Displays properties for the given datasets.
If no datasets are specified, then the command displays properties for all
datasets on the system.
For each property, the following columns are displayed:
.Bl -tag -compact -offset 4n -width "property"
.It Sy name
Dataset name
.It Sy property
Property name
.It Sy value
Property value
.It Sy source
Property source
.Sy local , default , inherited , temporary , received , No or Sy - Pq none .
.El
.Pp
All columns are displayed by default, though this can be controlled by using the
.Fl o
option.
This command takes a comma-separated list of properties as described in the
.Sx Native Properties
and
.Sx User Properties
sections of
.Xr zfsprops 7 .
.Pp
The value
.Sy all
can be used to display all properties that apply to the given dataset's type
.Pq Sy filesystem , volume , snapshot , No or Sy bookmark .
.Bl -tag -width "-s source"
.It Fl j , -json Op Ar --json-int
Display the output in JSON format.
Specify
.Sy --json-int
to display numbers in integer format instead of strings for JSON output.
.It Fl H
Display output in a form more easily parsed by scripts.
Any headers are omitted, and fields are explicitly separated by a single tab
instead of an arbitrary amount of space.
.It Fl d Ar depth
Recursively display any children of the dataset, limiting the recursion to
.Ar depth .
A depth of
.Sy 1
will display only the dataset and its direct children.
.It Fl o Ar field
A comma-separated list of columns to display, defaults to
.Sy name , Ns Sy property , Ns Sy value , Ns Sy source .
.It Fl p
Display numbers in parsable
.Pq exact
values.
.It Fl r
Recursively display properties for any children.
.It Fl s Ar source
A comma-separated list of sources to display.
Those properties coming from a source other than those in this list are ignored.
Each source must be one of the following:
.Sy local , default , inherited , temporary , received , No or Sy none .
The default value is all sources.
.It Fl t Ar type
A comma-separated list of types to display, where
.Ar type
is one of
.Sy filesystem , snapshot , volume , bookmark , No or Sy all .
.Sy fs ,
.Sy snap ,
or
.Sy vol
can be used as aliases for
.Sy filesystem ,
.Sy snapshot ,
or
.Sy volume .
.El
.It Xo
.Nm zfs
.Cm inherit
.Op Fl rS
.Ar property Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot Ns …
.Xc
Clears the specified property, causing it to be inherited from an ancestor,
restored to default if no ancestor has the property set, or with the
.Fl S
option reverted to the received value if one exists.
See
.Xr zfsprops 7
for a listing of default values, and details on which properties can be
inherited.
.Bl -tag -width "-r"
.It Fl r
Recursively inherit the given property for all children.
.It Fl S
Revert the property to the received value, if one exists;
otherwise, for non-inheritable properties, to the default;
otherwise, operate as if the
.Fl S
option was not specified.
.El
.El
.
.Sh EXAMPLES
.\" These are, respectively, examples 1, 4, 6, 7, 11, 14, 16 from zfs.8
.\" Make sure to update them bidirectionally
.Ss Example 1 : No Creating a ZFS File System Hierarchy
The following commands create a file system named
.Ar pool/home
and a file system named
.Ar pool/home/bob .
The mount point
.Pa /export/home
is set for the parent file system, and is automatically inherited by the child
file system.
.Dl # Nm zfs Cm create Ar pool/home
.Dl # Nm zfs Cm set Sy mountpoint Ns = Ns Ar /export/home pool/home
.Dl # Nm zfs Cm create Ar pool/home/bob
.
.Ss Example 2 : No Disabling and Enabling File System Compression
The following command disables the
.Sy compression
property for all file systems under
.Ar pool/home .
The next command explicitly enables
.Sy compression
for
.Ar pool/home/anne .
.Dl # Nm zfs Cm set Sy compression Ns = Ns Sy off Ar pool/home
.Dl # Nm zfs Cm set Sy compression Ns = Ns Sy on Ar pool/home/anne
.
.Ss Example 3 : No Setting a Quota on a ZFS File System
The following command sets a quota of 50 Gbytes for
.Ar pool/home/bob :
.Dl # Nm zfs Cm set Sy quota Ns = Ns Ar 50G pool/home/bob
.
.Ss Example 4 : No Listing ZFS Properties
The following command lists all properties for
.Ar pool/home/bob :
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm get Sy all Ar pool/home/bob
NAME           PROPERTY              VALUE                  SOURCE
pool/home/bob  type                  filesystem             -
pool/home/bob  creation              Tue Jul 21 15:53 2009  -
pool/home/bob  used                  21K                    -
pool/home/bob  available             20.0G                  -
pool/home/bob  referenced            21K                    -
pool/home/bob  compressratio         1.00x                  -
pool/home/bob  mounted               yes                    -
pool/home/bob  quota                 20G                    local
pool/home/bob  reservation           none                   default
pool/home/bob  recordsize            128K                   default
pool/home/bob  mountpoint            /pool/home/bob         default
pool/home/bob  sharenfs              off                    default
pool/home/bob  checksum              on                     default
pool/home/bob  compression           on                     local
pool/home/bob  atime                 on                     default
pool/home/bob  devices               on                     default
pool/home/bob  exec                  on                     default
pool/home/bob  setuid                on                     default
pool/home/bob  readonly              off                    default
pool/home/bob  zoned                 off                    default
pool/home/bob  snapdir               hidden                 default
pool/home/bob  acltype               off                    default
pool/home/bob  aclmode               discard                default
pool/home/bob  aclinherit            restricted             default
pool/home/bob  canmount              on                     default
pool/home/bob  xattr                 on                     default
pool/home/bob  copies                1                      default
pool/home/bob  version               4                      -
pool/home/bob  utf8only              off                    -
pool/home/bob  normalization         none                   -
pool/home/bob  casesensitivity       sensitive              -
pool/home/bob  vscan                 off                    default
pool/home/bob  nbmand                off                    default
pool/home/bob  sharesmb              off                    default
pool/home/bob  refquota              none                   default
pool/home/bob  refreservation        none                   default
pool/home/bob  primarycache          all                    default
pool/home/bob  secondarycache        all                    default
pool/home/bob  usedbysnapshots       0                      -
pool/home/bob  usedbydataset         21K                    -
pool/home/bob  usedbychildren        0                      -
pool/home/bob  usedbyrefreservation  0                      -
.Ed
.Pp
The following command gets a single property value:
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm get Fl H o Sy value compression Ar pool/home/bob
on
.Ed
.Pp
The following command gets a single property value recursively in JSON format:
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm get Fl j Fl r Sy mountpoint Ar pool/home | Nm jq
{
  "output_version": {
    "command": "zfs get",
    "vers_major": 0,
    "vers_minor": 1
  },
  "datasets": {
    "pool/home": {
      "name": "pool/home",
      "type": "FILESYSTEM",
      "pool": "pool",
      "createtxg": "10",
      "properties": {
        "mountpoint": {
          "value": "/pool/home",
          "source": {
            "type": "DEFAULT",
            "data": "-"
          }
        }
      }
    },
    "pool/home/bob": {
      "name": "pool/home/bob",
      "type": "FILESYSTEM",
      "pool": "pool",
      "createtxg": "1176",
      "properties": {
        "mountpoint": {
          "value": "/pool/home/bob",
          "source": {
            "type": "DEFAULT",
            "data": "-"
          }
        }
      }
    }
  }
}
.Ed
.Pp
The following command lists all properties with local settings for
.Ar pool/home/bob :
.Bd -literal -compact -offset Ds
.No # Nm zfs Cm get Fl r s Sy local Fl o Sy name , Ns Sy property , Ns Sy value all Ar pool/home/bob
NAME           PROPERTY              VALUE
pool/home/bob  quota                 20G
pool/home/bob  compression           on
.Ed
.
.Ss Example 5 : No Inheriting ZFS Properties
The following command causes
.Ar pool/home/bob No and Ar pool/home/anne
to inherit the
.Sy checksum
property from their parent.
.Dl # Nm zfs Cm inherit Sy checksum Ar pool/home/bob pool/home/anne
.
.Ss Example 6 : No Setting User Properties
The following example sets the user-defined
.Ar com.example : Ns Ar department
property for a dataset:
.Dl # Nm zfs Cm set Ar com.example : Ns Ar department Ns = Ns Ar 12345 tank/accounting
.
.Ss Example 7 : No Setting sharenfs Property Options on a ZFS File System
The following commands show how to set
.Sy sharenfs
property options to enable read-write
access for a set of IP addresses and to enable root access for system
.Qq neo
on the
.Ar tank/home
file system:
.Dl # Nm zfs Cm set Sy sharenfs Ns = Ns ' Ns Ar rw Ns =@123.123.0.0/16:[::1],root= Ns Ar neo Ns ' tank/home
.Pp
If you are using DNS for host name resolution,
specify the fully-qualified hostname.
.
.Sh SEE ALSO
.Xr zfsprops 7 ,
.Xr zfs-list 8