2.6 Customization Planning
The Cluster Manager’s ability to recognize a specific series of events and subevents permits a very flexible customization scheme. The HACMP for AIX software provides an event customization facility that allows you to tailor cluster event processing to your site.
2.6.1 Event Customization
As part of the planning process, you need to decide whether to customize event processing. If the actions taken by the default scripts are sufficient for your purposes, you do not need to do anything further to configure events during the installation process.
If you decide to tailor event processing to your environment, it is strongly recommended that you use the HACMP for AIX event customization facility described in this chapter. If you tailor event processing, you must register
You cannot define additional cluster events.
You can, however, define multiple pre- and
The event customization facility includes the following features:
•Event notification
•Pre- and
•Event recovery and retry
2.6.1.1 Special Application Requirements
Some applications may have some special requirements that have to be checked and ensured before or after a cluster event happens. In case of a failover you can customize events through the definition of pre- and post- events, to act according to your application’s needs. For example, an application might want to reset a counter or unlock a user before it can be started correctly on the failover node.
2.6.1.2 Event Notification
You can specify a notify command that sends mail to indicate that an event is about to happen (or has just occurred), and that an event script succeeded or failed. For example, a site may want to use a network_down notification
