Book Image

Troubleshooting NetScaler

By : Raghu Varma Tirumalaraju
Book Image

Troubleshooting NetScaler

By: Raghu Varma Tirumalaraju

Overview of this book

NetScaler is a high performance Application Delivery Controller (ADC). Making the most of it requires knowledge that straddles the application and networking worlds. As an ADC owner you will also likely be the first person to be solicited when your business applications fail. You will need to be quick in identifying if the problem is with the application, the server, the network, or NetScaler itself. This book provides you with the vital troubleshooting knowledge needed to act fast when issues happen. It gives you a thorough understanding of the NetScaler layout, how it integrates with the network, and what issues to expect when working with the traffic management, authentication, NetScaler Gateway and application firewall features. We will also look at what information to seek out in the logs, how to use tracing, and explore utilities that exist on NetScaler to help you find the root cause of your issues.
Table of Contents (17 chapters)
Troubleshooting NetScaler
Credits
Notice
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

High Availability


For many environments that use it, NetScaler becoming unavailable means losing access to a fleet of web applications, and even access to the corporate network in the case of NetScaler Gateway deployments. So it is little wonder that, when NetScaler is deployed in an enterprise, it is always deployed in High Availability (HA) pairs.

In a properly set up HA pair environment, the standby NetScaler, which we refer to as the secondary in this chapter, jumps into action within milliseconds of detecting a failure and announces its intention to become the primary. If the network is fast in adapting itself to the change of ownership, traffic gets restored within seconds of the failure.

Note

There are several other ways of providing High Availability via NetScaler – HA over INC, Route Health Injection, and Clustering. The focus of this section is on the way that more than 90% of deployments use it, which is High Availability in Active-Standby over layer 2 connectivity.

In the next few...