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Red Hat Enterprise Linux 9 Essentials Print and eBook (PDF) editions contain 34 chapters and 298 pages

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Red Hat Enterprise Linux 6

Virtual Server Administration

Load Balancer Add-On for Red Hat Enterprise Linux

Edition 6


Legal Notice

Copyright © 2010 Red Hat, Inc.
The text of and illustrations in this document are licensed by Red Hat under a Creative Commons Attribution–Share Alike 3.0 Unported license ("CC-BY-SA"). An explanation of CC-BY-SA is available at In accordance with CC-BY-SA, if you distribute this document or an adaptation of it, you must provide the URL for the original version.
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Building a Load Balancer Add-On system offers a highly available and scalable solution for production services using specialized Linux Virtual Servers (LVS) for routing and load-balancing techniques configured through the PIRANHA configuration tool. This book discusses the configuration of high-performance systems and services with Red Hat Enterprise Linux and the Load Balancer Add-On for Red Hat Enterprise Linux 6.

1. Document Conventions
1.1. Typographic Conventions
1.2. Pull-quote Conventions
1.3. Notes and Warnings
2. Feedback
1. Load Balancer Add-On Overview
1.1. A Basic Load Balancer Add-On Configuration
1.1.1. Data Replication and Data Sharing Between Real Servers
1.2. A Three-Tier Load Balancer Add-On Configuration
1.3. Load Balancer Add-On Scheduling Overview
1.3.1. Scheduling Algorithms
1.3.2. Server Weight and Scheduling
1.4. Routing Methods
1.4.1. NAT Routing
1.4.2. Direct Routing
1.5. Persistence and Firewall Marks
1.5.1. Persistence
1.5.2. Firewall Marks
1.6. Load Balancer Add-On — A Block Diagram
1.6.1. Load Balancer Add-On Components
2. Initial Load Balancer Add-On Configuration
2.1. Configuring Services on the LVS Routers
2.2. Setting a Password for the Piranha Configuration Tool
2.3. Starting the Piranha Configuration Tool Service
2.3.1. Configuring the Piranha Configuration Tool Web Server Port
2.4. Limiting Access To the Piranha Configuration Tool
2.5. Turning on Packet Forwarding
2.6. Configuring Services on the Real Servers
3. Setting Up Load Balancer Add-On
3.1. The NAT Load Balancer Add-On Network
3.1.1. Configuring Network Interfaces for Load Balancer Add-On with NAT
3.1.2. Routing on the Real Servers
3.1.3. Enabling NAT Routing on the LVS Routers
3.2. Load Balancer Add-On via Direct Routing
3.2.1. Direct Routing and arptables_jf
3.2.2. Direct Routing and iptables
3.3. Putting the Configuration Together
3.3.1. General Load Balancer Add-On Networking Tips
3.4. Multi-port Services and Load Balancer Add-On
3.4.1. Assigning Firewall Marks
3.5. Configuring FTP
3.5.1. How FTP Works
3.5.2. How This Affects Load Balancer Add-On Routing
3.5.3. Creating Network Packet Filter Rules
3.6. Saving Network Packet Filter Settings
4. Configuring the Load Balancer Add-On with Piranha Configuration Tool
4.1. Necessary Software
4.2. Logging Into the Piranha Configuration Tool
4.6.1. The VIRTUAL SERVER Subsection
4.6.2. REAL SERVER Subsection
4.7. Synchronizing Configuration Files
4.7.1. Synchronizing
4.7.2. Synchronizing sysctl
4.7.3. Synchronizing Network Packet Filtering Rules
4.8. Starting the Load Balancer Add-On
A. Using the Load Balancer Add-On with the High Availability Add-On
B. Revision History

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