﻿contains a Settings.xml file, that can specify parameters for the service

Configuration packages describe user defined, application overridable configuration settings (sections of key-value pairs)
required for running service replicas/instances of service types specified in the service manifest. The configuration settings 
must be stored in Settings.xml in the config package folder. 

The service developer uses Service Fabric APIs to locate the package folders and read application overridable configuration settings.
The service developer can also register callbacks that are invoked when any of the configuration packages specified in the
service manifest are upgraded and re-reads new configuration settings inside that callback. 

This means that Service Fabric will not recycle EXEs and DLLHOSTs specified in the host and support packages when
configuration packages are upgraded. 