]> git.ipfire.org Git - thirdparty/systemd.git/blobdiff - man/crypttab.xml
Reindent man pages to 2ch
[thirdparty/systemd.git] / man / crypttab.xml
index 1a1002ecf432490fab62600c4f72bbccfc7f2ae6..aeacc579733f137a92457047f6ca190c9fd92241 100644 (file)
 -->
 <refentry id="crypttab" conditional='HAVE_LIBCRYPTSETUP'>
 
-        <refentryinfo>
-                <title>crypttab</title>
-                <productname>systemd</productname>
-
-                <authorgroup>
-                        <author>
-                                <contrib>Documentation</contrib>
-                                <firstname>Miloslav</firstname>
-                                <surname>Trmac</surname>
-                                <email>mitr@redhat.com</email>
-                        </author>
-                        <author>
-                                <contrib>Documentation</contrib>
-                                <firstname>Lennart</firstname>
-                                <surname>Poettering</surname>
-                                <email>lennart@poettering.net</email>
-                        </author>
-                </authorgroup>
-        </refentryinfo>
-
-        <refmeta>
-                <refentrytitle>crypttab</refentrytitle>
-                <manvolnum>5</manvolnum>
-        </refmeta>
-
-        <refnamediv>
-                <refname>crypttab</refname>
-                <refpurpose>Configuration for encrypted block devices</refpurpose>
-        </refnamediv>
-
-        <refsynopsisdiv>
-                <para><filename>/etc/crypttab</filename></para>
-        </refsynopsisdiv>
-
-        <refsect1>
-                <title>Description</title>
-
-                <para>The <filename>/etc/crypttab</filename> file
-                describes encrypted block devices that are set up
-                during system boot.</para>
-
-                <para>Empty lines and lines starting with the <literal>#</literal>
-                character are ignored.  Each of the remaining lines
-                describes one encrypted block device, fields on the
-                line are delimited by white space.  The first two
-                fields are mandatory, the remaining two are
-                optional.</para>
-
-                <para>Setting up encrypted block devices using this file
-                supports three encryption modes: LUKS, TrueCrypt and plain.
-                See <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-                for more information about each mode. When no mode is specified
-                in the options field and the block device contains a LUKS
-                signature, it is opened as a LUKS device; otherwise, it is
-                assumed to be in raw dm-crypt (plain mode) format.</para>
-
-                <para>The first field contains the name of the
-                resulting encrypted block device; the device is set up
-                within <filename>/dev/mapper/</filename>.</para>
-
-                <para>The second field contains a path to the
-                underlying block device or file, or a specification of a block
-                device via <literal>UUID=</literal> followed by the
-                UUID.</para>
-
-                <para>The third field specifies the encryption
-                password.  If the field is not present or the password
-                is set to <literal>none</literal> or <literal>-</literal>,
-                the password has to be manually entered during system boot.
-                Otherwise, the field is interpreted as a absolute path to
-                a file containing the encryption password. For swap encryption,
-                <filename>/dev/urandom</filename> or the hardware
-                device <filename>/dev/hw_random</filename> can be used
-                as the password file; using
-                <filename>/dev/random</filename> may prevent boot
-                completion if the system does not have enough entropy
-                to generate a truly random encryption key.</para>
-
-                <para>The fourth field, if present, is a
-                comma-delimited list of options.  The following
-                options are recognized:</para>
-
-                <variablelist class='fstab-options'>
-
-                        <varlistentry>
-                                <term><option>discard</option></term>
-
-                                <listitem><para>Allow discard requests to be
-                                passed through the encrypted block device. This
-                                improves performance on SSD storage but has
-                                security implications.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>cipher=</option></term>
-
-                                <listitem><para>Specifies the cipher to use. See
-                                <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-                                for possible values and the default value of
-                                this option. A cipher with unpredictable IV
-                                values, such as <literal>aes-cbc-essiv:sha256</literal>,
-                                is recommended.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>hash=</option></term>
-
-                                <listitem><para>Specifies the hash to use for
-                                password hashing. See
-                                <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-                                for possible values and the default value of
-                                this option.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>header=</option></term>
-
-                                <listitem><para>Use a detached (separated)
-                                metadata device or file where the LUKS header
-                                is stored. This option is only relevant for
-                                LUKS devices. See
-                                <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-                                for possible values and the default value of
-                                this option.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>keyfile-offset=</option></term>
-
-                                <listitem><para>Specifies the number of bytes to
-                                skip at the start of the key file. See
-                                <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-                                for possible values and the default value of
-                                this option.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>keyfile-size=</option></term>
-
-                                <listitem><para>Specifies the maximum number
-                                of bytes to read from the key file. See
-                                <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-                                for possible values and the default value of
-                                this option. This option is ignored in plain
-                                encryption mode, as the key file size is then
-                                given by the key size.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>key-slot=</option></term>
-
-                                <listitem><para>Specifies the key slot to
-                                compare the passphrase or key against.
-                                If the key slot does not match the given
-                                passphrase or key, but another would, the
-                                setup of the device will fail regardless.
-                                This option implies <option>luks</option>. See
-                                <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-                                for possible values. The default is to try
-                                all key slots in sequential order.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>luks</option></term>
-
-                                <listitem><para>Force LUKS mode. When this mode
-                                is used, the following options are ignored since
-                                they are provided by the LUKS header on the
-                                device: <option>cipher=</option>,
-                                <option>hash=</option>,
-                                <option>size=</option>.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>noauto</option></term>
-
-                                <listitem><para>This device will not be
-                                automatically unlocked on boot.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>nofail</option></term>
-
-                                <listitem><para>The system will not wait for the
-                                device to show up and be unlocked at boot, and
-                                not fail the boot if it does not show up.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>plain</option></term>
-
-                                <listitem><para>Force plain encryption mode.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>read-only</option></term><term><option>readonly</option></term>
-
-                                <listitem><para>Set up the encrypted block
-                                device in read-only mode.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>size=</option></term>
-
-                                <listitem><para>Specifies the key size
-                                in bits. See
-                                <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-                                for possible values and the default value of
-                                this option.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>swap</option></term>
-
-                                <listitem><para>The encrypted block device will
-                                be used as a swap device, and will be formatted
-                                accordingly after setting up the encrypted
-                                block device, with
-                                <citerefentry project='man-pages'><refentrytitle>mkswap</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
-                                This option implies <option>plain</option>.</para>
-
-                                <para>WARNING: Using the <option>swap</option>
-                                option will destroy the contents of the named
-                                partition during every boot, so make sure the
-                                underlying block device is specified correctly.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>tcrypt</option></term>
-
-                                <listitem><para>Use TrueCrypt encryption mode.
-                                When this mode is used, the following options are
-                                ignored since they are provided by the TrueCrypt
-                                header on the device or do not apply:
-                                <option>cipher=</option>,
-                                <option>hash=</option>,
-                                <option>keyfile-offset=</option>,
-                                <option>keyfile-size=</option>,
-                                <option>size=</option>.</para>
-
-                                <para>When this mode is used, the passphrase is
-                                read from the key file given in the third field.
-                                Only the first line of this file is read,
-                                excluding the new line character.</para>
-
-                                <para>Note that the TrueCrypt format uses both
-                                passphrase and key files to derive a password
-                                for the volume. Therefore, the passphrase and
-                                all key files need to be provided. Use
-                                <option>tcrypt-keyfile=</option> to provide
-                                the absolute path to all key files. When using
-                                an empty passphrase in combination with one or
-                                more key files, use <literal>/dev/null</literal>
-                                as the password file in the third field.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>tcrypt-hidden</option></term>
-
-                                <listitem><para>Use the hidden TrueCrypt volume.
-                                This option implies <option>tcrypt</option>.</para>
-
-                                <para>This will map the hidden volume that is
-                                inside of the volume provided in the second
-                                field. Please note that there is no protection
-                                for the hidden volume if the outer volume is
-                                mounted instead. See
-                                <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-                                for more information on this limitation.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>tcrypt-keyfile=</option></term>
-
-                                <listitem><para>Specifies the absolute path to a
-                                key file to use for a TrueCrypt volume. This
-                                implies <option>tcrypt</option> and can be
-                                used more than once to provide several key
-                                files.</para>
-
-                                <para>See the entry for <option>tcrypt</option>
-                                on the behavior of the passphrase and key files
-                                when using TrueCrypt encryption mode.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>tcrypt-system</option></term>
-
-                                <listitem><para>Use TrueCrypt in system
-                                encryption mode. This option implies
-                                <option>tcrypt</option>.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>timeout=</option></term>
-
-                                <listitem><para>Specifies the timeout for
-                                querying for a password. If no unit is
-                                specified, seconds is used. Supported units are
-                                s, ms, us, min, h, d. A timeout of 0 waits
-                                indefinitely (which is the default).</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>x-systemd.device-timeout=</option></term>
-
-                                <listitem><para>Specifies how long
-                                systemd should wait for a device to
-                                show up before giving up on the
-                                entry. The argument is a time in
-                                seconds or explicitly specified
-                                units of <literal>s</literal>,
-                                <literal>min</literal>,
-                                <literal>h</literal>,
-                                <literal>ms</literal>.
-                                </para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>tmp</option></term>
-
-                                <listitem><para>The encrypted block device will
-                                be prepared for using it as <filename>/tmp</filename>;
-                                it will be formatted using
-                                <citerefentry project='man-pages'><refentrytitle>mke2fs</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
-                                This option implies <option>plain</option>.</para>
-
-                                <para>WARNING: Using the <option>tmp</option>
-                                option will destroy the contents of the named
-                                partition during every boot, so make sure the
-                                underlying block device is specified correctly.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>tries=</option></term>
-
-                                <listitem><para>Specifies the maximum number of
-                                times the user is queried for a password.
-                                The default is 3. If set to 0, the user is
-                                queried for a password indefinitely.</para></listitem>
-                        </varlistentry>
-
-                        <varlistentry>
-                                <term><option>verify</option></term>
-
-                                <listitem><para> If the encryption password is
-                                read from console, it has to be entered twice to
-                                prevent typos.</para></listitem>
-                        </varlistentry>
-
-                </variablelist>
-
-                <para>At early boot and when the system manager
-                configuration is reloaded, this file is translated into
-                native systemd units
-                by <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
-        </refsect1>
-
-        <refsect1>
-                <title>Example</title>
-                <example>
-                        <title>/etc/crypttab example</title>
-                        <para>Set up four encrypted block devices. One using
-                        LUKS for normal storage, another one for usage as a swap
-                        device and two TrueCrypt volumes.</para>
-
-                        <programlisting>luks       UUID=2505567a-9e27-4efe-a4d5-15ad146c258b
-swap       /dev/sda7       /dev/urandom             swap
+  <refentryinfo>
+    <title>crypttab</title>
+    <productname>systemd</productname>
+
+    <authorgroup>
+      <author>
+        <contrib>Documentation</contrib>
+        <firstname>Miloslav</firstname>
+        <surname>Trmac</surname>
+        <email>mitr@redhat.com</email>
+      </author>
+      <author>
+        <contrib>Documentation</contrib>
+        <firstname>Lennart</firstname>
+        <surname>Poettering</surname>
+        <email>lennart@poettering.net</email>
+      </author>
+    </authorgroup>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>crypttab</refentrytitle>
+    <manvolnum>5</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>crypttab</refname>
+    <refpurpose>Configuration for encrypted block devices</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <para><filename>/etc/crypttab</filename></para>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para>The <filename>/etc/crypttab</filename> file describes
+    encrypted block devices that are set up during system boot.</para>
+
+    <para>Empty lines and lines starting with the <literal>#</literal>
+    character are ignored. Each of the remaining lines describes one
+    encrypted block device, fields on the line are delimited by white
+    space. The first two fields are mandatory, the remaining two are
+    optional.</para>
+
+    <para>Setting up encrypted block devices using this file supports
+    three encryption modes: LUKS, TrueCrypt and plain. See
+    <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+    for more information about each mode. When no mode is specified in
+    the options field and the block device contains a LUKS signature,
+    it is opened as a LUKS device; otherwise, it is assumed to be in
+    raw dm-crypt (plain mode) format.</para>
+
+    <para>The first field contains the name of the resulting encrypted
+    block device; the device is set up within
+    <filename>/dev/mapper/</filename>.</para>
+
+    <para>The second field contains a path to the underlying block
+    device or file, or a specification of a block device via
+    <literal>UUID=</literal> followed by the UUID.</para>
+
+    <para>The third field specifies the encryption password. If the
+    field is not present or the password is set to
+    <literal>none</literal> or <literal>-</literal>, the password has
+    to be manually entered during system boot. Otherwise, the field is
+    interpreted as a absolute path to a file containing the encryption
+    password. For swap encryption, <filename>/dev/urandom</filename>
+    or the hardware device <filename>/dev/hw_random</filename> can be
+    used as the password file; using <filename>/dev/random</filename>
+    may prevent boot completion if the system does not have enough
+    entropy to generate a truly random encryption key.</para>
+
+    <para>The fourth field, if present, is a comma-delimited list of
+    options. The following options are recognized:</para>
+
+    <variablelist class='fstab-options'>
+
+      <varlistentry>
+        <term><option>discard</option></term>
+
+        <listitem><para>Allow discard requests to be passed through
+        the encrypted block device. This improves performance on SSD
+        storage but has security implications.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>cipher=</option></term>
+
+        <listitem><para>Specifies the cipher to use. See
+        <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+        for possible values and the default value of this option. A
+        cipher with unpredictable IV values, such as
+        <literal>aes-cbc-essiv:sha256</literal>, is
+        recommended.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>hash=</option></term>
+
+        <listitem><para>Specifies the hash to use for password
+        hashing. See
+        <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+        for possible values and the default value of this
+        option.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>header=</option></term>
+
+        <listitem><para>Use a detached (separated) metadata device or
+        file where the LUKS header is stored. This option is only
+        relevant for LUKS devices. See
+        <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+        for possible values and the default value of this
+        option.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>keyfile-offset=</option></term>
+
+        <listitem><para>Specifies the number of bytes to skip at the
+        start of the key file. See
+        <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+        for possible values and the default value of this
+        option.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>keyfile-size=</option></term>
+
+        <listitem><para>Specifies the maximum number of bytes to read
+        from the key file. See
+        <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+        for possible values and the default value of this option. This
+        option is ignored in plain encryption mode, as the key file
+        size is then given by the key size.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>key-slot=</option></term>
+
+        <listitem><para>Specifies the key slot to compare the
+        passphrase or key against. If the key slot does not match the
+        given passphrase or key, but another would, the setup of the
+        device will fail regardless. This option implies
+        <option>luks</option>. See
+        <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+        for possible values. The default is to try all key slots in
+        sequential order.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>luks</option></term>
+
+        <listitem><para>Force LUKS mode. When this mode is used, the
+        following options are ignored since they are provided by the
+        LUKS header on the device: <option>cipher=</option>,
+        <option>hash=</option>,
+        <option>size=</option>.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>noauto</option></term>
+
+        <listitem><para>This device will not be automatically unlocked
+        on boot.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>nofail</option></term>
+
+        <listitem><para>The system will not wait for the device to
+        show up and be unlocked at boot, and not fail the boot if it
+        does not show up.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>plain</option></term>
+
+        <listitem><para>Force plain encryption mode.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>read-only</option></term><term><option>readonly</option></term>
+
+        <listitem><para>Set up the encrypted block device in read-only
+        mode.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>size=</option></term>
+
+        <listitem><para>Specifies the key size in bits. See
+        <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+        for possible values and the default value of this
+        option.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>swap</option></term>
+
+        <listitem><para>The encrypted block device will be used as a
+        swap device, and will be formatted accordingly after setting
+        up the encrypted block device, with
+        <citerefentry project='man-pages'><refentrytitle>mkswap</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+        This option implies <option>plain</option>.</para>
+
+        <para>WARNING: Using the <option>swap</option> option will
+        destroy the contents of the named partition during every boot,
+        so make sure the underlying block device is specified
+        correctly.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>tcrypt</option></term>
+
+        <listitem><para>Use TrueCrypt encryption mode. When this mode
+        is used, the following options are ignored since they are
+        provided by the TrueCrypt header on the device or do not
+        apply:
+        <option>cipher=</option>,
+        <option>hash=</option>,
+        <option>keyfile-offset=</option>,
+        <option>keyfile-size=</option>,
+        <option>size=</option>.</para>
+
+        <para>When this mode is used, the passphrase is read from the
+        key file given in the third field. Only the first line of this
+        file is read, excluding the new line character.</para>
+
+        <para>Note that the TrueCrypt format uses both passphrase and
+        key files to derive a password for the volume. Therefore, the
+        passphrase and all key files need to be provided. Use
+        <option>tcrypt-keyfile=</option> to provide the absolute path
+        to all key files. When using an empty passphrase in
+        combination with one or more key files, use
+        <literal>/dev/null</literal> as the password file in the third
+        field.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>tcrypt-hidden</option></term>
+
+        <listitem><para>Use the hidden TrueCrypt volume. This option
+        implies <option>tcrypt</option>.</para>
+
+        <para>This will map the hidden volume that is inside of the
+        volume provided in the second field. Please note that there is
+        no protection for the hidden volume if the outer volume is
+        mounted instead. See
+        <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+        for more information on this limitation.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>tcrypt-keyfile=</option></term>
+
+        <listitem><para>Specifies the absolute path to a key file to
+        use for a TrueCrypt volume. This implies
+        <option>tcrypt</option> and can be used more than once to
+        provide several key files.</para>
+
+        <para>See the entry for <option>tcrypt</option> on the
+        behavior of the passphrase and key files when using TrueCrypt
+        encryption mode.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>tcrypt-system</option></term>
+
+        <listitem><para>Use TrueCrypt in system encryption mode. This
+        option implies <option>tcrypt</option>.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>timeout=</option></term>
+
+        <listitem><para>Specifies the timeout for querying for a
+        password. If no unit is specified, seconds is used. Supported
+        units are s, ms, us, min, h, d. A timeout of 0 waits
+        indefinitely (which is the default).</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>x-systemd.device-timeout=</option></term>
+
+        <listitem><para>Specifies how long systemd should wait for a
+        device to show up before giving up on the entry. The argument
+        is a time in seconds or explicitly specified units of
+        <literal>s</literal>,
+        <literal>min</literal>,
+        <literal>h</literal>,
+        <literal>ms</literal>.
+        </para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>tmp</option></term>
+
+        <listitem><para>The encrypted block device will be prepared
+        for using it as <filename>/tmp</filename>; it will be
+        formatted using
+        <citerefentry project='man-pages'><refentrytitle>mke2fs</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+        This option implies <option>plain</option>.</para>
+
+        <para>WARNING: Using the <option>tmp</option> option will
+        destroy the contents of the named partition during every boot,
+        so make sure the underlying block device is specified
+        correctly.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>tries=</option></term>
+
+        <listitem><para>Specifies the maximum number of times the user
+        is queried for a password. The default is 3. If set to 0, the
+        user is queried for a password indefinitely.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>verify</option></term>
+
+        <listitem><para> If the encryption password is read from
+        console, it has to be entered twice to prevent
+        typos.</para></listitem>
+      </varlistentry>
+
+    </variablelist>
+
+    <para>At early boot and when the system manager configuration is
+    reloaded, this file is translated into native systemd units by
+    <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Example</title>
+    <example>
+      <title>/etc/crypttab example</title>
+      <para>Set up four encrypted block devices. One using LUKS for
+      normal storage, another one for usage as a swap device and two
+      TrueCrypt volumes.</para>
+
+      <programlisting>luks       UUID=2505567a-9e27-4efe-a4d5-15ad146c258b
+swap       /dev/sda7       /dev/urandom       swap
 truecrypt  /dev/sda2       /etc/container_password  tcrypt
-hidden     /mnt/tc_hidden  /dev/null                tcrypt-hidden,tcrypt-keyfile=/etc/keyfile</programlisting>
-                </example>
-        </refsect1>
-
-        <refsect1>
-                <title>See Also</title>
-                <para>
-                        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
-                        <citerefentry project='man-pages'><refentrytitle>mkswap</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
-                        <citerefentry project='man-pages'><refentrytitle>mke2fs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-                </para>
-        </refsect1>
+hidden     /mnt/tc_hidden  /dev/null    tcrypt-hidden,tcrypt-keyfile=/etc/keyfile</programlisting>
+    </example>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>mkswap</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>mke2fs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+    </para>
+  </refsect1>
 
 </refentry>