Book Image

Mastering PostgreSQL 15 - Fifth Edition

By : Hans-Jürgen Schönig
Book Image

Mastering PostgreSQL 15 - Fifth Edition

By: Hans-Jürgen Schönig

Overview of this book

Starting with an introduction to the newly released features of PostgreSQL 15, this updated fifth edition will help you get to grips with PostgreSQL administration and how to build dynamic database solutions for enterprise apps, including designing both physical and technical aspects of the system. You'll explore advanced PostgreSQL features, such as logical replication, database clusters, advanced indexing, and user management to manage and maintain your database. You'll then work with the PostgreSQL optimizer, configure PostgreSQL for high speed, and move from Oracle to PostgreSQL. Among the other skills that the book will help you build, you’ll cover transactions, handling recursions, working with JSON and JSONB data, and setting up a Patroni cluster. It will show you how to improve performance with query optimization. You'll also focus on managing network security and work with backups and replication while exploring useful PostgreSQL extensions that optimize the performance of large databases. By the end of this PostgreSQL book, you’ll be able to use your database to its utmost capacity by implementing advanced administrative tasks with ease.
Table of Contents (16 chapters)

Setting up an HA cluster using Patroni

After this introduction to PostgreSQL replication and some basic techniques, it is time to put it all together and solve an important problem – PostgreSQL HA. A single server or a single piece of hardware is always prone to error. If a server fails, we want to avoid the entire infrastructure going down. What we want is some kind of backup server to take over in case of failure.

In the PostgreSQL world, Patroni has become the de facto standard for achieving HA. Therefore, this section is all about Patroni and how you can use it to make PostgreSQL database setups more reliable.

Understand how Patroni operates

Before we can get started, it is important to explain the underlying logic of Patroni in general. Traditionally, an HA setup consisted of two servers that were connected using two network interfaces. One network interface would serve to move the data inside a cluster. The second connection served as a witness to distinguish...