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Designed to be run on a timer on the server.
It checks that:
- Web services are running
- The database is up
- The ORB is operational
- The Expresso Framework is running correctly
- The ServletRunner is operational
- Pilot/PIP is operation (if applicable at
site)
- Email services are operational.
Tests may be defined which execute a specific URL and
measure how long it takes to respond, as well as checking for a specific
response. This helps ensure the sytem is operating correctly.
All except the last item on the above list, give a warning message in email,
the last one just gets a big warning on the console & a message in
the log. Health Check is an essential utility for large sites when each
of these services may be on a different server.
If any of these checks fails, the HealthCheck
utility stops what it is doing and attempts
to notify the system administrator by one
of several means:
- It logs a message into the server log (red)
- It attempts to send an email to the SYSERROR event list of users
- It displays a prominent message on the console
(in case all other notifications fail)
Health Check can also be monitored real-time
by a special System Status/Health Check Servlet
web page, which automatically updates itself
at a user-specified interval (e.g. every
30 seconds). It performs all of the selected
health check functions, and shows a check
mark for every successful check. It also
shows a distinctive "warning" icon
for any function that fails, along with a
detailed description of the problem &
an audio warning (so the system administrator
is alerted even if not actually watching
the page). This page can be left up on a
console for a continuous monitoring of the
overall system health at all times.
HealthCheck performs the following tests:
- Verifies that the control database is operational
by connecting to it & reading setup values
- Verifies that the Object Request Broker is
operational by connecting to it
- Verifies that the Application Framework is
operational by connecting to it
- Verifies that the SMTP email server is operational by sending a test e-mail
to a fictional user
- Verifies that the servlet runtime system
is operational by running a special status
servlet
- Using our extensibility philosophy, Health
Check can be configured to check other system
functions, i.e. could verify that PIP/Pilot
is operational by requesting status.
To Use HealthCheck, select the "Operation" menu choice in Expresso's
Admin menu. Scroll down to the heading, "Periodic System and Performance Tests." There you will see a list
of functions like the below:
| HealthCheck Function |
Description |
| Run Performance Tests |
- |
| Run HealthCheck |
- |
| Performance
Test Definitions |
- |
| Performance
Test Stats |
- |
| Performance
Test Sets |
- |
| Performance
Test Set Details |
- |
For technical information about how to use Expresso Health Check, please
refer to the Expresso Developers Guide (EDG) or the Javadocs.
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