provides a registrar service for Reliable Server Pooling (RSerPool) pool
elements (PEs) and pool users (PUs). PRs of an operation scope synchronize
their view of the handlespace using the Endpoint haNdlespace Redundancy
Protocol (ENRP), transported via SCTP. An operation scope has a limited range,
e.g. an organization or only a building. In particular, it is restricted to a
single administrative domain - in contrast to GRID computing - in order to
keep the management complexity at a minimum. Nevertheless, PEs may be
distributed globally for their service to survive localized disasters.
PEs choose an arbitrary PR of the operation scope to register into a pool by
using the Aggregate Server Access Protocol (ASAP), again transported via SCTP.
Upon registration at a PR, the chosen PR becomes the Home-PR (PR-H) of the
newly registered PE. A PR-H is responsible for monitoring its PEs' availability
by keep-alive messages (to be acknowledged by the PE within a given timeout)
and propagates the information about its PEs to the other PRs of the operation
scope via ENRP updates.
In order to access the service of a pool given by its PH, a PU requests a PE
selection from an arbitrary PR of the operation scope, using the Aggregate
Server Access Protocol (ASAP), transported via SCTP. The PR selects the
requested list of PE identities by applying a pool-specific selection rule,
called pool policy.
In order to allow for automatic configuration, a PR can send out regular
announces via an ASAP and ENRP multicast address. PEs and PUs can listen to
this address to learn the list of currently available PRs.
The following options are available:
Do not print startup and shutdown messages.
Sets the TTL for outgoing ASAP Announce/ENRP Presence messages via multicast.
It is recommended to use at least a value of 2 to see possibly
important error messages and warnings.
Turns ANSI colorization of the logging output on or off.
Write logging output to a file (default is stdout); output will be appended to given file.
Write logging output to a file (default is stdout); given file will be overwritten.
Sets the logging verbosity from 0 (none) to 9 (very verbose).
Component Status Protocol (CSP) Parameters:
Sets the interval for the CSP status updates in milliseconds.
Sets the CSP monitor server's address and port.
Aggregate Server Access Protocol (ASAP) Parameters:
Sets the SCTP autoclose timeout for idle ASAP associations.
Sets the ASAP endpoint address(es). Use "auto" to automatically set it (default).
Sets the multicast address and UDP port to send the ASAP Announces to. Use "auto" to automatically set it (default). Examples:
Sets the maximum number of ASAP Endpoint Unreachable reports before
removing a PE.
Sets the MaxIncrement constant. Handle with care!
Sets the MaxHResItems constant.
Sets the minimum address scope acceptable for registered PEs:
loopback: Loopback address (only valid on the same node!)
site-local: Site-local addresses (e.g. 192.168.1.1, etc.)
global: Global addresses