startup - event signalling system startup
The startup event is generated by the Upstart init(8) daemon after it
has completed its own initialisation and is the signal that the rest of
the system may be started.
Typically this will involve checking and mounting the partitions and
drives that form the filesystem, loading drivers for connected devices
and starting the X windowing system or other login environment.
In the default Upstart configuration, the primary task run on the
startup event is the /etc/init/rc-sysinit.conf job responsible for
generating the System V compatible runlevel(7) event. See that page
for a more detailed explanation of this process.
Paradoxically there is currently no corresponding Upstart-native event
signifying that the system is to be shutdown, only the System V
compatible runlevel 0 and runlevel 6 events provide this functionality.
A service with no other dependencies run on startup might use:
start on startup