SYSTEMD-VOLATILE-ROOT.SERsystemd-volatile-rootSYSTEMD-VOLATILE-ROOT.SERVICE(8)
NAME
systemd-volatile-root.service, systemd-volatile-root - Make the root
file system volatile
SYNOPSIS
systemd-volatile-root.service
/lib/systemd/systemd-volatile-root
DESCRIPTION
systemd-volatile-root.service is a service that replaces the root
directory with a volatile memory file system ("tmpfs"), mounting the
original (non-volatile) /usr/ inside it read-only. This way, vendor
data from /usr/ is available as usual, but all configuration data in
/etc/, all state data in /var/ and all other resources stored directly
under the root directory are reset on boot and lost at shutdown,
enabling fully stateless systems.
This service is only enabled if full volatile mode is selected, for
example by specifying "systemd.volatile=yes" on the kernel command
line. This service runs only in the initrdyes, before the system
transitions to the host's root directory. Note that this service is not
used if "systemd.volatile=state" is used, as in that mode the root
directory is non-volatile.
SEE ALSO
systemd(1), systemd-fstab-generator(8), kernel-command-line(7)
systemd 252 SYSTEMD-VOLATILE-ROOT.SERVICE(8)
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