Book Image

PostgreSQL High Availability Cookbook - Second Edition

By : Shaun Thomas
Book Image

PostgreSQL High Availability Cookbook - Second Edition

By: Shaun Thomas

Overview of this book

Databases are nothing without the data they store. In the event of a failure - catastrophic or otherwise - immediate recovery is essential. By carefully combining multiple servers, it’s even possible to hide the fact a failure occurred at all. From hardware selection to software stacks and horizontal scalability, this book will help you build a versatile PostgreSQL cluster that will survive crashes, resist data corruption, and grow smoothly with customer demand. It all begins with hardware selection for the skeleton of an efficient PostgreSQL database cluster. Then it’s on to preventing downtime as well as troubleshooting some real life problems that administrators commonly face. Next, we add database monitoring to the stack, using collectd, Nagios, and Graphite. And no stack is complete without replication using multiple internal and external tools, including the newly released pglogical extension. Pacemaker or Raft consensus tools are the final piece to grant the cluster the ability to heal itself. We even round off by tackling the complex problem of data scalability. This book exploits many new features introduced in PostgreSQL 9.6 to make the database more efficient and adaptive, and most importantly, keep it running.
Table of Contents (18 chapters)
Title Page
About the Author
About the Reviewer
Customer Feedback

Backing up a database with Barman

After Barman is installed, we should be able to leverage any of its capabilities using the Barman command-line tool. For now, we will focus entirely on creating a backup, verifying that the new backup exists, and examining its contents.

Barman doesn't just produce backups, it also catalogs them extensively. We will use this to our advantage in this recipe to prove that Barman works as advertised.

Getting ready

This recipe depends on Barman being installed on a backup server. Please follow the Installing and configuring Barman recipe before continuing.

How to do it...

All steps should be executed as the barman system user on the pg-backup server that we were using in the previous recipe. Follow these steps to create, verify, and examine a Barman backup:

  1. Create the first backup with this command:
barman backup primary
  1. Examine a list of backups with this command:
barman list-backup primary
  1. View the metadata of the most recent backup with this command:
barman show-backup...