Book Image

PostgreSQL 9 High Availability Cookbook

By : Shaun Thomas
Book Image

PostgreSQL 9 High Availability Cookbook

By: Shaun Thomas

Overview of this book

A comprehensive series of dependable recipes to design, build, and implement a PostgreSQL server architecture free of common pitfalls that can operate for years to come. Each chapter is packed with instructions and examples to simplify even highly complex database operations. If you are a PostgreSQL DBA working on Linux systems who want a database that never gives up, this book is for you. If you've ever experienced a database outage, restored from a backup, spent hours trying to repair a malfunctioning cluster, or simply want to guarantee system stability, this book is definitely for you.
Table of Contents (12 chapters)
11
Index

Adding a virtual IP to hide the cluster

We discussed virtual IP addresses earlier; now, it's time to leverage them properly. A virtual IP is not a service in the traditional sense, but it does provide functionality that we need in a highly-available configuration. In cases where we also have control over DNS resolution, we can even assign a name to the virtual IP address to insulate applications from future changes.

For now, this recipe will limit itself to outlining the steps required to add a transitory IP address to Pacemaker.

Getting ready

As we're continuing to configure Pacemaker, make sure you've followed all the previous recipes.

How to do it...

We will assume that the 192.168.56.30 IP address exists as a predefined target for our PostgreSQL cluster. Users and applications will connect to it instead of the actual addresses of pg1 or pg2.

Perform these steps on any Pacemaker node as the root user:

  1. Add an IP address primitive to Pacemaker with crm:
    crm configure primitive pg_vip...