Provided by: systemd_245.4-4ubuntu3_amd64 bug


       systemd-volatile-root.service, systemd-volatile-root - Make the root file system volatile





       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 initial
       RAM disk ("initrd"), 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.


       systemd(1), systemd-fstab-generator(8), kernel-command-line(7)