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Chapter 13 Working With Network Services 153
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.
LL2354.book Page 153 Monday, October 20, 2003 9:47 AM