summaryrefslogtreecommitdiff
path: root/man/systemd.mount.xml
blob: 40d236b266e18eaa9e48ab04cb3c3cc5792509f5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
<?xml version='1.0'?> <!--*-nxml-*-->
<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
        "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

<!--
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->

<refentry id="systemd.mount">
        <refentryinfo>
                <title>systemd.mount</title>
                <productname>systemd</productname>

                <authorgroup>
                        <author>
                                <contrib>Developer</contrib>
                                <firstname>Lennart</firstname>
                                <surname>Poettering</surname>
                                <email>lennart@poettering.net</email>
                        </author>
                </authorgroup>
        </refentryinfo>

        <refmeta>
                <refentrytitle>systemd.mount</refentrytitle>
                <manvolnum>5</manvolnum>
        </refmeta>

        <refnamediv>
                <refname>systemd.mount</refname>
                <refpurpose>systemd mount configuration files</refpurpose>
        </refnamediv>

        <refsynopsisdiv>
                <para><filename>systemd.mount</filename></para>
        </refsynopsisdiv>

        <refsect1>
                <title>Description</title>

                <para>A unit configuration file whose name ends in
                <filename>.mount</filename> encodes information about
                a file system mount point controlled and supervised by
                systemd.</para>

                <para>This man page lists the configuration options
                specific to this unit type. See
                <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                for the common options of all unit configuration
                files. The common configuration items are configured
                in the generic [Unit] and [Install] sections. The
                mount specific configuration options are configured
                in the [Mount] section.</para>

                <para>Additional options are listed in
                <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                which define the execution environment the
                <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
                binary is executed in.</para>

                <para>Mount units must be named after the mount point
                directories they control. Example: the mount point
                <filename>/home/lennart</filename> must be configured
                in a unit file
                <filename>home-lennart.mount</filename>. For details
                about the escaping logic used to convert a file system
                path to a unit name see
                <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>

                <para>Optionally, a mount unit may be accompanied by
                an automount unit, to allow on-demand or parallelized
                mounting. See
                <citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>

                <para>If an mount point is beneath another mount point
                in the file system hierarchy, a dependency between both
                units is created automatically.</para>

                <para>Mount points created at runtime independent on
                unit files or <filename>/etc/fstab</filename> will be
                monitored by systemd and appear like any other mount
                unit in systemd.</para>
        </refsect1>

        <refsect1>
                <title><filename>fstab</filename></title>

                <para>Mount units may either be configured via unit
                files, or via <filename>/etc/fstab</filename> (see
                <citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                for details).</para>

                <para>When reading <filename>/etc/fstab</filename> a
                few special mount options are understood by systemd
                which influence how dependencies are created for mount
                points from <filename>/etc/fstab</filename>. If
                <option>comment=systemd.mount</option> is specified as
                mount option, then systemd will create a dependency of
                type <option>Wants</option> from either
                <filename>local-fs.target</filename> or
                <filename>remote-fs.target</filename>, depending
                whether the file system is local or remote. If
                <option>comment=systemd.automount</option> is set, an
                automount unit will be created for the file system. See
                <citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                for details.</para>

                <para>If a mount point is configured in both
                <filename>/etc/fstab</filename> and a unit file, the
                configuration in the latter takes precedence.</para>
        </refsect1>

        <refsect1>
                <title>Options</title>

                <para>Mount files must include a [Mount] section,
                which carries information about the file system mount points it
                supervises. A number of options that may be used in
                this section are shared with other unit types. These
                options are documented in
                <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>. The
                options specific to the [Mount] section of mount
                units are the following:</para>

                <variablelist>

                        <varlistentry>
                                <term><varname>What=</varname></term>
                                <listitem><para>Takes an absolute path
                                of a device node, file or other
                                resource to mount. See
                                <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
                                for details. If this refers to a
                                device node, a dependency on the
                                respective device unit is
                                automatically created. (See
                                <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry> for more information.)
                                This option is
                                mandatory.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>Where=</varname></term>
                                <listitem><para>Takes an absolute path
                                of a directory of the mount point. If
                                the mount point is not existing at
                                time of mounting, it is created. This
                                string must be reflected in the unit
                                file name. (See above.) This option is
                                mandatory.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>Type=</varname></term>
                                <listitem><para>Takes a string for the
                                filesystem type. See
                                <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
                                for details. This setting is
                                optional.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>Options=</varname></term>

                                <listitem><para>Mount options to use
                                when mounting. This takes a comma
                                separated list of options. This
                                setting is optional.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>DirectoryMode=</varname></term>
                                <listitem><para>Directories of mount
                                points (and any parent directories)
                                are automatically created if
                                needed. This option specifies the file
                                system access mode used when creating
                                these directories. Takes an access
                                mode in octal notation. Defaults to
                                0755.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>TimeoutSec=</varname></term>
                                <listitem><para>Configures the time to
                                wait for the mount command to
                                finish. If a command does not exit
                                within the configured time the mount
                                will be considered failed and be shut
                                down again. All commands still running
                                will be terminated forcibly via
                                SIGTERM, and after another delay of
                                this time with SIGKILL. (See
                                <option>KillMode=</option> below.)
                                Takes a unit-less value in seconds, or
                                a time span value such as "5min
                                20s". Pass 0 to disable the timeout
                                logic. Defaults to
                                3min.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>KillMode=</varname></term>
                                <listitem><para>Specifies how
                                processes of this mount shall be
                                killed. One of
                                <option>control-group</option>,
                                <option>process</option>,
                                <option>none</option>.</para>

                                <para>This option is mostly equivalent
                                to the <option>KillMode=</option>
                                option of service files. See
                                <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                                for details.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>KillSignal=</varname></term>
                                <listitem><para>Specifies which signal
                                to use when killing a process of this
                                mount. Defaults to SIGTERM.
                                </para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>SendSIGKILL=</varname></term>
                                <listitem><para>Specifies whether to
                                send SIGKILL to remaining processes
                                after a timeout, if the normal
                                shutdown procedure left processes of
                                the mount around. Takes a boolean
                                value. Defaults to "yes".
                                </para></listitem>
                        </varlistentry>
                </variablelist>
        </refsect1>

        <refsect1>
                  <title>See Also</title>
                  <para>
                          <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                          <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
                          <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                          <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                          <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                          <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
                  </para>
        </refsect1>

</refentry>