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PostgreSQL 9 High Availability Cookbook

You're reading from   PostgreSQL 9 High Availability Cookbook Over 100 recipes to design and implement a highly available server with the advanced features of PostgreSQL.

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Product type Paperback
Published in Jul 2014
Publisher Packt
ISBN-13 9781849516969
Length 398 pages
Edition 1st Edition
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Author (1):
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Shaun Thomas Shaun Thomas
Author Profile Icon Shaun Thomas
Shaun Thomas
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Toc

Table of Contents (12) Chapters Close

Preface 1. Hardware Planning FREE CHAPTER 2. Handling and Avoiding Downtime 3. Pooling Resources 4. Troubleshooting 5. Monitoring 6. Replication 7. Replication Management Tools 8. Advanced Stack 9. Cluster Control 10. Data Distribution Index

Combining and ordering related actions

There are two final pieces of the puzzle that will produce a fully functional Pacemaker cluster. At this point, we have three independent base-level entries in Pacemaker: DRBD, the PGServer group, and the e-mail alert. They are independent because Pacemaker may start or stop them on any server in the list of active nodes.

We can fix this by defining a colocation between related resources. When we create a colocation, we are effectively stating that wherever this service goes, this other service should follow. Of course, this by itself is not sufficient. We also need to declare the expected order necessary for the services to start.

In this recipe, we'll finish our Pacemaker setup by creating necessary colocation entries, and define a service start order.

Getting ready

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

How to do it...

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

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