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...
Before we explain the steps of this recipe, we want to mention that none of this process is actually necessary except for killing the patroni daemon on the node we're upgrading. If we stop Patroni on pgha1, the cluster will eventually notice and elect a new leader without our direct intervention. However, depending on our timeout settings, the cluster may remain without a leader for several seconds. This recipe ensures the cluster is never without a primary server and is always writable.
Otherwise, our first step is to start a monitor on pgha3 since it will be upgraded last. This allows us to see which node is the current leader and any transition states while we upgrade the other two systems. This is important since pgha1 ...
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