= ORBIT Infrastructure =
== Standard Infrastructure Services ==

These are standard system services that are facilitating testbed operation
 
 * [wiki:Internal/Infrastructure/DNSService DNS]
    Purpose: Provides hostname resolution; the standard BIND9 software package
 * [wiki:Internal/Infrastructure/DHCPService DHCP] 
    Purpose: IP addresses to clients based on their MAC addresses
   * [wiki:Internal/Infrastructure/DHCPService#PXE PXE]
 * [wiki:Internal/Infrastructure/TFTPService TFTP]
   * [wiki:Internal/Infrastructure/TFTPService#PXE PXE]
 * [wiki:Internal/Infrastructure/NFSService NFS]
 * [wiki:Internal/Infrastructure/AptService APT Repository]
    Purpose: This serves as the debian package repository for local ORBIT packages (such as OML, OTG, Libmac, nodeAgent etc). It uses apache services to fetch and distribute debian packages. For this service, it is sufficient to install just the ORBIT packages. There is no need to mirror the entire debian repository which can be easily accessed by syncing with the external debian repository.

== Orbit Management Framework ==

Consists of three major software components:

 * [wiki:Internal/Infrastructure#GridServices Grid Services]
 * [wiki:Internal/Infrastructure#NodeHandler Node Handler]
 * [wiki:Internal/Infrastructure#NodeAgent Node Agent]

=== Grid Services ===

All testbed services are based on [wiki:Internal/Infrastructure/OMF/GridServicesApi ORBIT Grid Services API]. The services are

 1. [wiki:Internal/Infrastructure/OMF/CMCGridService Chassis Manager Controller (CMC) Service]
 2. [wiki:Internal/Infrastructure/OMF/FrisbeeGridService Frisbee Service]
 3. [wiki:Internal/Infrastructure/OMF/GridServices/Inventory Inventory Service]
 4. [wiki:Internal/Infrastructure/OMF/LoginGridService Login Service]
 5. [wiki:Internal/Infrastructure/OMF/OMLGridService OML Service]
 6. [wiki:Internal/Infrastructure/OMF/PXEGridService PXE Service]
 7. [wiki:Internal/Infrastructure/OMF/InterferenceGridService Interference Service]

=== Node Handler ===

The nodehandler is the central experiment controller. A central '''NodeHandler''' process communicates with '''NodeAgents''', one on each active node in the testbed.  The '''NodeHandler''' is hosted on one of the testbed's utility servers (typically called console).  Applications are loaded and executed by a '''NodeAgent''' on instructions from the '''NodeHandler'''.  These instructions will also include the initial property settings for the applications.

In addition to providing interfaces for experiment execution, nodehandler also provides the following built in commands:

 * [wiki:Internal/Infrastructure/OMF/NodeHandler/Commands/LoadNode load - Install a given disk image on the nodes in a testbed]
 * [wiki:Internal/Infrastructure/OMF/NodeHandler/Commands/SaveNode save - Saving node image]
 * [wiki:Internal/Infrastructure/OMF/NodeHandler/Commands/TellNode tell - Switch ON/OFF the nodes in a testbed]
 * [wiki:Internal/Infrastructure/OMF/NodeHandler/Commands/StatNode stat - Returns the status of the nodes in a testbed]

=== Node Agent ===

Component that runs on a node and is in the receiving side of the !NodeHandler commands.

= Images =

== PXE Image ==

== Experiment Image ==