Startup Sequence /etc/init

Question

is there a start up sequence regarding configuration files in /etc/init ?

Where can found document regarding the syntax ?

Thanks

Answer 1

Documentation references

You can found all you need in upstart cookbook.

Ubuntu currently employs a hybrid system where core services are handled by Upstart, but additional services can be run in the legacy SystemV mode.

An introduction to run-levels is useful to understand SystemV

Ordering

According to upstart manual:

Upstart emits "events" which services can register an interest in. When an event -- or combination of events -- is emitted that satisfies some service's requirements, Upstart will automatically start or stop that service. If multiple jobs have the same "start on" condition, Upstart will start those jobs ''in parallel''.

Upstart init start/stop service based on event, this is why:

As a general rule, you cannot rely upon the the order in which events will be emitted. Your system is dynamic and Upstart responds to changes as-and-when they occur (for example hot-plug events).