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

Setting up Bucardo

Bucardo is another popular logical replication engine that actually seems to have originated earlier than Slony, in 2002. Like Slony, it also uses triggers to perform its synchronization activity, but its syntax is much simpler. Furthermore, it also provides multimaster capabilities; this means that changes made in either the primary or secondary node will appear in both copies of a replicated table.

There is something to be said for tools that encourage simplicity when maintaining a complex high availability architecture. Let's explore Bucardo further.

Getting ready

The latest stable version of Bucardo at the time of writing this book is 5.4.1. Obtain the latest source package from the following URL:

Bucardo is written in Perl, so it requires quite a few Perl-based prerequisites. On Debian-based systems, install them using the following apt-get commands:

sudo apt-get install libdbix-safe-perl libdbd-pg-perl libboolean-   
perlsudo apt-get...