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

Installing and configuring OmniPITR

Up until now, we've been managing WAL files with tools such as cp or rsync. Our end goal was to transmit these to a backup server so that the WAL files were safe long-term in case we needed them for PITR recovery. As a bonus, the backup server is a central location that can be committed to tape regularly so that our PostgreSQL databases are preserved so long as we retain the tapes.

While this is a valid and functional approach, logging options, debugging, and flexibility are somewhat limited. Regular operating-system tools are not specifically designed to process PostgreSQL WAL files. Though we can use them for that purpose, there are better utilities available. OmniPITR is a powerful toolkit developed by OmniTI to manage PostgreSQL backups, restores, and WAL files.

This recipe will focus on installing OmniPITR so that we can use it later.

Getting ready

At the time of writing this book, the most recent version of OmniPITR is 1.3.3. In order to install it,...