The GStat visualization package contains a visualization library and various cgi scripts that are us

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Grid Status 2.0
Enabling Grids for E-sciencE
Overview
The Grid Information System is a
mission-critical component of the EGEE production
infrastructure. It enables users, applications
and services to discover which services exist and
further information about their structure and
state. It is therefore important that the
information system components themselves are
functioning correctly and that the information
content is reliable. Grid Status (GStat) is the
monitoring component of the EGEE information
system, a hierarchical system built out of more
than 260 site level and 70 global aggregation
services. It validates the information which is
presented and provides summary and history
displays for use by Grid operators and system
administrators. Version 2.0, a major revision of
GStat, is currently in the final stages of
development.
The GStat validation package contains a set of
scripts that are used to validate an information
source. These scripts use a common library to
ensure that they all have the same "look and
feel" and behave in a consistent manner. This
source for the tests can either be an LDAP server
or an LDIF file. The results of testing can be
directed to different output channels the two
main ones being standard out and the GStat
database.
GStat Validation
GStat Monitoring leverages the Nagios
monitoring framework and Nagios probes have been
created to monitor the information system
components. These probes are common to GStat and
the Nagios-based Multi-Level Monitoring Framework
from the Operations Automation Team. GStat uses
the entity cache to discover which information
system components should be monitored by Nagios.
GStat Monitoring
The GStat architecture is split into four main
areas core, validation, monitoring and
visualization. At the centre of the system is a
database where the data model defines the
interface between the other areas. GStat core is
responsible for extracting information from the
information system and maintaining an entity
cache. GStat visualization uses this information
for the structure of displays and GStat
validation conducts various validation tests on
the information content. This mechanism has been
designed so that it can be also be executed on
the command line and as such can be used directly
by system administrators and automated testing
suites. GStat monitoring uses the entity cache to
configure a monitoring framework that leverages
Nagios. The results of the validation tests are
stored in the GStat database, Nagios is used for
the monitoring results. GStat visualization uses
all this information to present various views
based on different used cases.
Architecture
The GStat visualization package contains a
visualization library and various cgi scripts
that are used to produce the web pages. The pages
present the information from the GStat database
and Nagios. Custom pages can be created using
the visualization library.
GStat Visualization
The GStat core package contains common
libraries and scripts that are used by the other
components. The primary function of this package
is to initialize and maintain the GStat database.
A snapshot of the information system is stored in
the database and can be used to find metadata
about the sites and services. This snapshot is
created by running the snapshot script which also
updates the entity cache.
GStat Core
Authors
Joanna Huang and Min Tsai, ASGC L. Field, CERN-IT
EGEE-III INFSO-RI-222667
http//goc.grid.sinica.edu.tw/gstat