282 lines
7.5 KiB
HTML
282 lines
7.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of SYSTEMD-FSTAB-GENERATOR</TITLE>
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</HEAD><BODY>
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<H1>SYSTEMD-FSTAB-GENERATOR</H1>
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Section: systemd-fstab-generator (8)<BR>Updated: <BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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systemd-fstab-generator - Unit generator for /etc/fstab
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<P>
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/lib/systemd/system-generators/systemd-fstab-generator
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<P>
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systemd-fstab-generator
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is a generator that translates
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/etc/fstab
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(see
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<B><A HREF="/cgi-bin/man/man2html?5+fstab">fstab</A></B>(5)
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for details) into native systemd units early at boot and when configuration of the system manager is reloaded. This will instantiate mount and swap units as necessary.
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<P>
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The
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<I>passno</I>
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field is treated like a simple boolean, and the ordering information is discarded. However, if the root file system is checked, it is checked before all the other file systems.
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<P>
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See
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<B><A HREF="/cgi-bin/man/man2html?5+systemd.mount">systemd.mount</A></B>(5)
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and
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<B><A HREF="/cgi-bin/man/man2html?5+systemd.swap">systemd.swap</A></B>(5)
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for more information about special
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/etc/fstab
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mount options this generator understands.
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<P>
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One special topic is handling of symbolic links. Historical init implementations supported symlinks in
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/etc/fstab. Because mount units will refuse mounts where the target is a symbolic link, this generator will resolve any symlinks as far as possible when processing
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/etc/fstab
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in order to enhance backwards compatibility. If a symlink target does not exist at the time that this generator runs, it is assumed that the symlink target is the final target of the mount.
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<P>
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systemd-fstab-generator
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implements
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<B><A HREF="/cgi-bin/man/man2html?7+systemd.generator">systemd.generator</A></B>(7).
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<A NAME="lbAE"> </A>
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<H2>KERNEL COMMAND LINE</H2>
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<P>
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systemd-fstab-generator
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understands the following kernel command line parameters:
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<P>
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<I>fstab=</I>, <I>rd.fstab=</I>
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<DL COMPACT><DT id="1"><DD>
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Takes a boolean argument. Defaults to
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"yes". If
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"no", causes the generator to ignore any mounts or swap devices configured in
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/etc/fstab.
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<I>rd.fstab=</I>
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is honored only by the initial RAM disk (initrd) while
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<I>fstab=</I>
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is honored by both the main system and the initrd.
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</DL>
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<P>
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<I>root=</I>
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<DL COMPACT><DT id="2"><DD>
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Takes the root filesystem to mount in the initrd.
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<I>root=</I>
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is honored by the initrd.
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</DL>
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<P>
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<I>rootfstype=</I>
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<DL COMPACT><DT id="3"><DD>
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Takes the root filesystem type that will be passed to the mount command.
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<I>rootfstype=</I>
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is honored by the initrd.
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</DL>
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<P>
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<I>rootflags=</I>
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<DL COMPACT><DT id="4"><DD>
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Takes the root filesystem mount options to use.
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<I>rootflags=</I>
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is honored by the initrd.
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<P>
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Note that unlike most kernel command line options this setting does not override settings made in configuration files (specifically: the mount option string in
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/etc/fstab). See
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<B><A HREF="/cgi-bin/man/man2html?8+systemd-remount-fs.service">systemd-remount-fs.service</A></B>(8).
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</DL>
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<P>
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<I>mount.usr=</I>
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<DL COMPACT><DT id="5"><DD>
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Takes the
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/usr
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filesystem to be mounted by the initrd. If
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<I>mount.usrfstype=</I>
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or
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<I>mount.usrflags=</I>
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is set, then
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<I>mount.usr=</I>
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will default to the value set in
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<I>root=</I>.
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<P>
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Otherwise, this parameter defaults to the
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/usr
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entry found in
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/etc/fstab
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on the root filesystem.
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<P>
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<I>mount.usr=</I>
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is honored by the initrd.
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</DL>
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<P>
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<I>mount.usrfstype=</I>
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<DL COMPACT><DT id="6"><DD>
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Takes the
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/usr
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filesystem type that will be passed to the mount command. If
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<I>mount.usr=</I>
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or
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<I>mount.usrflags=</I>
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is set, then
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<I>mount.usrfstype=</I>
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will default to the value set in
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<I>rootfstype=</I>.
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<P>
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Otherwise, this value will be read from the
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/usr
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entry in
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/etc/fstab
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on the root filesystem.
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<P>
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<I>mount.usrfstype=</I>
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is honored by the initrd.
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</DL>
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<P>
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<I>mount.usrflags=</I>
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<DL COMPACT><DT id="7"><DD>
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Takes the
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/usr
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filesystem mount options to use. If
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<I>mount.usr=</I>
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or
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<I>mount.usrfstype=</I>
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is set, then
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<I>mount.usrflags=</I>
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will default to the value set in
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<I>rootflags=</I>.
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<P>
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Otherwise, this value will be read from the
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/usr
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entry in
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/etc/fstab
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on the root filesystem.
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<P>
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<I>mount.usrflags=</I>
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is honored by the initrd.
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</DL>
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<P>
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<I>systemd.volatile=</I>
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<DL COMPACT><DT id="8"><DD>
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Controls whether the system shall boot up in volatile mode. Takes a boolean argument or the special value
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<B>state</B>.
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<P>
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If false (the default), this generator makes no changes to the mount tree and the system is booted up in normal mode.
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<P>
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If true the generator ensures
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<B><A HREF="/cgi-bin/man/man2html?8+systemd-volatile-root.service">systemd-volatile-root.service</A></B>(8)
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is run as part of the initial RAM disk ("initrd"). This service changes the mount table before transitioning to the host system, so that a volatile memory file system ("tmpfs") is used as root directory, with only
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/usr
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mounted into it from the configured root file system, in read-only mode. This way the system operates in fully stateless mode, with all configuration and state reset at boot and lost at shutdown, as
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/etc
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and
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/var
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will be served from the (initially unpopulated) volatile memory file system.
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<P>
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If set to
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<B>state</B>
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the generator will leave the root directory mount point unaltered, however will mount a
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"tmpfs"
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file system to
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/var. In this mode the normal system configuration (i.e. the contents of
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"/etc") is in effect (and may be modified during system runtime), however the system state (i.e. the contents of
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"/var") is reset at boot and lost at shutdown.
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<P>
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If this setting is set to
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"overlay"
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the root file system is set up as
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"overlayfs"
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mount combining the read-only root directory with a writable
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"tmpfs", so that no modifications are made to disk, but the file system may be modified nonetheless with all changes being lost at reboot.
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<P>
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Note that in none of these modes the root directory,
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/etc,
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/var
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or any other resources stored in the root file system are physically removed. It's thus safe to boot a system that is normally operated in non-volatile mode temporarily into volatile mode, without losing data.
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<P>
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Note that with the exception of
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"overlay"
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mode, enabling this setting will only work correctly on operating systems that can boot up with only
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/usr
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mounted, and are able to automatically populate
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/etc, and also
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/var
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in case of
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"systemd.volatile=yes".
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</DL>
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<A NAME="lbAF"> </A>
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<H2>SEE ALSO</H2>
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<P>
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<B><A HREF="/cgi-bin/man/man2html?1+systemd">systemd</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?5+fstab">fstab</A></B>(5),
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<B><A HREF="/cgi-bin/man/man2html?5+systemd.mount">systemd.mount</A></B>(5),
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<B><A HREF="/cgi-bin/man/man2html?5+systemd.swap">systemd.swap</A></B>(5),
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<B><A HREF="/cgi-bin/man/man2html?8+systemd-cryptsetup-generator">systemd-cryptsetup-generator</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?7+kernel-command-line">kernel-command-line</A></B>(7)
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="9"><A HREF="#lbAB">NAME</A><DD>
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<DT id="10"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="11"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="12"><A HREF="#lbAE">KERNEL COMMAND LINE</A><DD>
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<DT id="13"><A HREF="#lbAF">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:16 GMT, March 31, 2021
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</BODY>
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</HTML>
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