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ApacheCon EU 2006: Dublin, June 28, 2006.
Hello World (Slide Two)
- Introduction
- The Basics:
- A Problem and Possible Solution
- Review of Proxying
- Review of Load Balancing
- The Nit anf Gritty
- The Solution
- Setting Up the Reverse Proxy
- Setting Up the Load Balancer
- Pulling Everything Together
Notice (Slide Three)
"Persons attempting to find a motive in this narrative will be prosecuted;persons attempting to find a moral will be banished; persons attempting to find a plot will be shot."
- Preface for The Adventures of Huck Finn By Mark Twain
The Basics (Slide Four)
Proxying and Load Balancing
The Problem (Slide Five)
- Control Access to Internal Set of Web Servers Providing a Critical Web Application while Managing the Proper Utilization of Web Servers in Question
The Problem (Slide Six)
Possible Solution (Slide Seven)
- Reverse Web Proxy
- Control Access to Internal Web Servers
- Sits @ Gateway to Internal Network
- Cache Content
- Control Access
- Filter Content
Possible Solution (Slide Eight)
- Load Balancer
- Redundancy with Failover for Critical App
- Distribution of Work Load for Better Utilization of Web Servers
Possible Solution (Slide Nine)
- Apache Specific
- mod_proxy and mod_rewrite
- mod_proxy and mod_jk
- Apache Module for Communication Between Apache and Tomcat Instances
- Provides Load Balancing of
- mod_proxy and mod_proxy_balancer
- "One" Solution mod_proxy_* for All Requirements
- Provides Load Balancing of
Apache 2.2 (Slide Ten)
- Released on 2/Dec/05
- Current Version is 2.2.2
- Continues Redevelopment and Enhancement of mod_proxy
- mod_proxy_balancer
- mod_proxy_ajp
mod_proxy (Slide Eleven)
- Important Feature of Apache Web Server
- Forward or Reverse Proxying
- Modules in Play
- mod_proxy
- mod_proxy_http
- mod_proxy_ftp
- mod_proxy_connect
- mod_proxy_html
- mod_cache
mod_proxy_balancer (Slide Twelve)
- New to Apache with Version 2.2
- Provides Load Balancing for
- Load Balancing Methods
- Request Counting
- Traffic Counting
The Nit and Gritty (Slide Thirteen)
Creating and Putting to Use Our Proxy/Load Balancing Server
The Solution (Slide Fourteen)
Setting Up Reverse Proxy (Slide Fifteen)
- ProxyRequests - Enable/Disable Forward Proxying
- ProxyPass - Pass Requests for /wcs Onward
- ProxyPassReverse - Remap Header Information
Setting Up Load Balancer (Slide Sixteen)
- ProxyPass
- stickysession - Sticky Session Name, if Defined
- nofailover - If Enabled, Current Session Break if Worker Disabled
- lbmethod - Load Balancing Method in Use, byrequest or bytraffic
- timeout - Time to Wait for a Worker
- maxattempts - Number of Failover Attempts Before Giving Up
Setting Up Load Balancer (Slide Seventeen)
- BalanceMember
- loadfactor - Worker Load Factor Between 1 and 100 and Defines the Normalized Weighted Load Applied to the Worker.
- route - Route of the Worker. The Route is a Value Appended to Session ID Name.
- redirect - Redirection Route of the Worker.
Setting Up Load Balancer (Slide Eighteen)
Pulling Everything Together (Slide Nineteen)
- RequestHeader - Replace, Merge or Remove HTTP Request Headers
- ProxyHTMLURLMap - This Directive, Part of mod_proxy_html, is Used for Rewriting HTML Links
- ProxyPassReverseCookiePath - Similar to ProxyPassReverse, but Rewrites the Path String in the Set-Cookie Header
Pulling Everything Together (Slide Twenty)
Pulling Everything Together (Slide Twenty One)
- Single Point of Failure at Proxy/Load Balancer
- Need Solution for Proxy/Load Balancer
Pulling Everything Together (Slides Twenty Two)
Review (Slide Twenty Three)
- The Basics
- Review of Proxying
- Review of Load Balancing
- A Problem and Possible Solution
- The Nit and Gritty
- The Solution
- Setting Up the Reverse Proxy
- Setting Up the Load Balancer
- Pulling Everything Together
Citation (Slide Twenty Four)
Resources (Slide Twenty Five)
Any Questions? (Slide Twenty Six)
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It is properly said that the Devil can "quote Scripture to
his purpose." The Bible is full of so many stories of
contradictory moral purpose that every generation can
find scriptural justification for nearly any action it
proposes - from incest, slavery, and mass murder to the
most refined love, courage, and self-sacrifice. And this
moral multiple personality disorder is hardly restricted to
Judaism and Christianity. You can find it deep within
Islam, the Hindu tradition, indeed nearly all the world's
religions. Perhaps then it is ... people who are morally
ambiguous.
Scripture is said to be divinely inspired - a phrase with
many meanings. But what if it's simply made up by
fallible humans? Miracles are attested, but what if they're
instead some mix of charlatanry, unfamiliar states of
consciousness, misapprehensions of natural phenomena,
and mental illness? The fact that so little of the finds of
modern science is prefigured in Scripture to my mind
casts further doubt on its divine inspiration.
But of course I might be wrong.
-Carl Sagan
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