FSTAB DEFAULTS GENERATOR

If set to state the generator will leave the root directory mount point unaltered, however will mount a 'tmpfs' file system to /var/. This way the system operates in fully stateless mode, with all configuration and state reset at boot and lost at shutdown, as /etc/ and /var/ will be served from the (initially unpopulated) volatile memory file system.

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 /usr/ mounted into it from the configured root file system, in read-only mode. If true the generator ensures rvice(8) is run as part of the initial RAM disk ('initrd'). If false (the default), this generator makes no changes to the mount tree and the system is booted up in normal mode. Takes a boolean argument or the special value state. systemd.volatile =Ĭontrols whether the system shall boot up in volatile mode. If these kernel command line options are set the root (or /usr/) file system is thus mounted from a device mapper volume /dev/mapper/root (or /dev/mapper/usr). When set this indicates that the root file system (or /usr/) shall be mounted from Verity volumes with the specified hashes. These options are primarily read by systemd-veritysetup-generator(8). If r= or rfstype= is set, then rflags= will default to the value set in rootflags=. Takes the /usr/ filesystem mount options to use. Otherwise, this value will be read from the /usr/ entry in /etc/fstab on the root filesystem. If r= or rflags= is set, then rfstype= will default to the value set in rootfstype=. Takes the /usr/ filesystem type that will be passed to the mount command. Otherwise, this parameter defaults to the /usr/ entry found in /etc/fstab on the root filesystem. If rfstype= or rflags= is set, then r= will default to the value set in root=. Takes the /usr/ filesystem to be mounted by the initrd. Note that unlike most kernel command line options this setting does not override settings made in configuration files (specifically: the mount option string in /etc/fstab). Takes the root filesystem mount options to use. Takes the root filesystem type that will be passed to the mount command. This is useful in combination with r= (see below) in order to combine a volatile root file system with a separate, immutable /usr/ file system.

Use 'tmpfs' in order to mount a tmpfs(5) file system as root file system of the OS. Use 'gpt-auto' to explicitly request automatic root file system discovery via systemd-gpt-auto-generator(8). or similar), or the special values 'gpt-auto' and 'tmpfs'. This accepts a device node path (usually /dev/disk/by-uuid/. root =Ĭonfigures the operating system's root filesystem to mount when running in the initrd. rd.fstab= is honored only by the initial RAM disk (initrd) while fstab= is honored by both the main system and the initrd. If 'no', causes the generator to ignore any mounts or swap devices configured in /etc/fstab. Systemd-fstab-generator understands the following kernel command line parameters: fstab =, rd.fstab = Systemd-fstab-generator implements systemd.generator(7). 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. 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 /etc/fstab in order to enhance backwards compatibility. Historical init implementations supported symlinks in /etc/fstab. One special topic is handling of symbolic links. See systemd.mount(5) and systemd.swap(5) for more information about special /etc/fstab mount options this generator understands. However, if the root file system is checked, it is checked before all the other file systems. The passno field is treated like a simple boolean, and the ordering information is discarded.

This will instantiate mount and swap units as necessary. Systemd-fstab-generator is a generator that translates /etc/fstab (see fstab(5) for details) into native systemd units early at boot and when configuration of the system manager is reloaded. usr/lib/systemd/system-generators/systemd-fstab-generator Description

Fstab defaults