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Load Balancing Servers, Firewalls and Caches - Kopparapu C.

Kopparapu C. Load Balancing Servers, Firewalls and Caches - Wiley Computer Publishing, 2002. - 123 p.
ISBN 0-471-41550-2
Download (direct link): networkadministration2002.pdf
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Load Balancing: Definition and Applications...........................................................3
Load-Balancing Products...............................................................................4
The Name Conundrum....................................................................................5
How This Book Is Organized............................................................................5
Who Should Read This Book.............................................................................6
Summary...............................................................................................6
Chapter 2: Server Load Balancing: Basic Concepts..............................................................7
Overview;.............................................................................................7
Networking Fundamentals...............................................................................7
Switching Primer.............................................................................7
TCP Overview.................................................................................8
Web Server Overview;.........................................................................9
The Server Farm with a Load Balancer.................................................................10
Basic Packet Flow in load balancing..................................................................12
Health Checks........................................................................................14
Basic Health Checks.........................................................................15
Application-Specific Health Checks..........................................................15
Application Dependency;.....................................................................16
Content Checks..............................................................................16
Scripting...................................................................................16
Agent-Based Checks..........................................................................17
The Ultimate Health Check...................................................................17
Network-Address Translation..........................................................................18
Destination NAT.............................................................................18
Source NAT..................................................................................18
Reverse NAT.................................................................................20
Enhanced NAT................................................................................21
Port-Address Translation....................................................................21
Direct Server Return.................................................................................22
Summary..............................................................................................24
Chapter 3: Server load balancing: Advanced Concepts..........................................................25
Session Persistence..................................................................................25
Defining Session Persistence................................................................25
Types of Session Persistence................................................................27
Source IP-Based Persistence Methods.........................................................27
The Megaproxy Problem.......................................................................30
Delayed Binding.............................................................................32
Cookie Switching............................................................................34
Cookie-Switching Applications...............................................................37
Cookie-Switching Considerations.............................................................38
SSL Session ID Switching....................................................................38
Designing to Deal with Session Persistence 40
HTTP to HTTPS Transition....................................................................41
URL Switching........................................................................................43
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Table of Contents
Chapter 3: Server load balancing: Advanced Concepts
Separating Static and Dynamic Content.......................................................44
URL Switching Usage Guidelines..............................................................45
Summary.............................................................................................46
Chapter 4: Network Design with Load Balancers...............................................................47
The Load Balancer as a Layer 2 Switch versus a Router...............................................47
Simple Designs......................................................................................49
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