PolyServe Understudy 1.3
5. Adding and Deleting Service Monitors
To add a service monitor to a given virtual host, first select the virtual
host to which the service belongs by pointing the mouse on
the virtual host and clicking on the mouse left button. After
the virtual host is selected, choose the Add Service Monitor to
Selected Host
option from the Cluster menu.
Understudy will then open a Add a Service Monitor dialog box. In this
dialog box, choose the port number of the service you wish to
protect, and then the type of service: HTTP, FTP, SMTP, or
general TCP, by clicking on the corresponding check button.
Finally, click OK to authorize, or Cancel to cancel.
- Note:
- If you first choose the type of service, Understudy will
automatically fill the port number field with the default
port number for that type of service (80 for HTTP, 21 for
FTP, and 25 for SMTP). You can always override the default
port number.
- Note:
- If you define several service monitors for the same virtual host and
one of the services fails for that virtual host on the primary
server, then all internet requests for that virtual host will
be routed to the backup server.
- Note:
- Adding a service monitor does not actually configure the service
on the given host, but rather tells Understudy that this service
needs to be monitored.
To delete a service monitor, first select the service monitor you wish to
delete by pointing the mouse on the service and clicking on the mouse left
button. Then choose the Delete Selected Service Monitor from the
Cluster menu.
- Note:
- Deleting a service monitor will delete it from all servers in the
cluster. However, if the same service monitor, e.g., for HTTP, is defined
for several virtual hosts, it will be deleted only from the virtual
host it was chosen from.
- Note:
- By deleting a service monitor, you are simply telling Understudy
to stop monitoring that service. This has no effect on the
service itself.