(debian-policy.info)Alternate init systems

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9.11 Alternate init systems
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A number of other init systems are available now in Debian that can be
used in place of sysvinit.  Alternative init implementations must
support running SysV init scripts as described at Note: System run
levels and init.d scripts. for compatibility.

Packages may integrate with these replacement init systems by providing
implementation-specific configuration information about how and when to
start a service or in what order to run certain tasks at boot time.
However, any package integrating with other init systems must also be
backwards-compatible with sysvinit by providing a SysV-style init script
with the same name as and equivalent functionality to any init-specific
job, as this is the only start-up configuration method guaranteed to be
supported by all init implementations.  An exception to this rule is
scripts or jobs provided by the init implementation itself; such jobs
may be required for an implementation-specific equivalent of the
‘/etc/rcS.d/’ scripts and may not have a one-to-one correspondence with
the init scripts.

Event-based boot with upstart