For example, your secondary server may perform other services on the network such as running a statistical analysis application and distributed image processing software. A preacquisition script quits the running applications to free up the CPU for the Web server. A postacquisition script starts the Web server. Once the primary is up and running again, a prerelinquish script quits the Web server, and a postrelinquish script starts the image processing and statistical analysis applications. The sequence of scripted events might look like this:

<Failover condition detected> Test (if present) PreAcq10.StopDIP PreAcq20.StopSA PreAcq30.CleanupTmp <Acquire IP address> PostAcq10.StartTimer PostAcq20.StartApache

<Primary server returns to service> PreRel10.StopApache PreRel20.StopTimer

<Relinquish IP address> PostRel10.StartSA PostRel20.StartDIP PostRel30.MailTimerResultsToAdmin

Enabling PPP Dial-In

You can use the pppd command to set up Point-to-Point Protocol (PPP) dial-in service. For more information, see the man page. The “Examples” section of the man page shows an example of setting up dial-in service.

Chapter 13 Working With Network Services

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Image 153
Apple oxs manual Enabling PPP Dial-In