PolyServe Understudy 1.3

5. Adding and Deleting Service Monitors

5.1 Add a Service Monitor to the Cluster

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.

5.2 Delete a Service Monitor from the Cluster

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.