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

Content switching


In this section, we will look at troubleshooting Content Switching. CS, as it is called in short, can be thought of as the single IP face of an infrastructure that is large and complex in the background. The idea is to have the CS vServer use Administrator configured rules to choose target LB vServers that each handle load balance for a particular type of content. The rules are the main value offered here as they can get very granular in identifying minute differences between two requests.

As such, troubleshooting CS in the vast majority of cases comes down to verifying two things:

  • You have the right policies in place

  • The LB vServers that are bound are up

Troubleshooting service unavailable errors

I have a CS VIP (cs-vip) that choses either the vServer base-vip, containing only HTML, or the vServer image-vip, containing only images by looking at the URL.

I try to access the VIP, and instead of the page with images that I expected to see, I land on a Service Unavailable error...