February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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Don't think that our VIP takeover script is the only thing that is possible to accomplish here. In fact, we hope you don't even use our example at all. There are no safeguards that verify that the VIP no longer works after attempting to deactivate it; in fact, there aren't any other kinds of error checking at all. A real production-quality script would, for example, ensure that the VIP could be claimed before finally calling repmgr standby promote.
In fact, the script can do basically anything that doesn't affect the cluster until finally triggering the promotion step itself. Provided that each of these steps includes some kind of verification or exception handling, all it takes to abort the whole process is to either return ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.