February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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How it works...
The focus of this recipe is on operational customization. We begin by defining a script that performs several actions on our behalf.
Say that we want a VIP to always be located on the current primary node. In the event of a switchover or failover, this means that the VIP must be moved. The easiest (but perhaps not the safest) way to do this is to connect to the VIP itself and invoke a command that destroys it.
Our ssh command does just that, and we use the ConnectTimeout and ServerAliveInterval options to ensure that our connection doesn't get stuck because we terminate the VIP while still connected to it. The reason for specifying StrictHostKeyChecking and UserKnownHostsFile is less obvious. We do this because the VIP is ...
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