JAKERI

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Consulting/Development in Java, Objective-C for web based systems and iPhone

Mar 18, 2009 10

Sticky load balance with Apache HTTPD 2.2

Apache HTTPD 2.2 includes some interesting features for making a basic load balancer.

This configuration makes a sticky loadbalancer with 3 backend servers. It is not dependant on any specific configuration of the backend server such as JSESSIONID or PHPSESSIONID.
It will create a BALANCEID-cookie with a route to a backend server.


#You need at least these modules
#Header used for setting cookie
LoadModule headers_module ...
#Proxy
LoadModule proxy_module ...
LoadModule proxy_http_module ...
LoadModule proxy_balancer_module ...

#Set a cookie if BALANCER_ROUTE_CHANGED containing BALANCER_WORKER_ROUTE environment variable
Header add Set-Cookie "BALANCEID=hej.%{BALANCER_WORKER_ROUTE}e; path=/;" env=BALANCER_ROUTE_CHANGED

#Show balancer-manager
<Location /balancer-manager>
  SetHandler balancer-manager
  Order allow,deny
  Allow from all
</Location>

ProxyRequests Off

#Configure members for cluster
<Proxy balancer://jakeri>
  BalancerMember http://b1.jakeri.net:80 route=server1
  BalancerMember http://b2.jakeri.net:80 route=server2
  BalancerMember http://b3.jakeri.net:80 route=server3
</Proxy>

#Do not proxy balancer-manager
ProxyPass /balancer-manager !

#The actual ProxyPass
ProxyPass / balancer://jakeri/ stickysession=BALANCEID nofailover=Off

#Do not forget ProxyPassReverse for redirects
ProxyPassReverse / http://b1.jakeri.net/
ProxyPassReverse / http://b2.jakeri.net/
ProxyPassReverse / http://b3.jakeri.net/

I believe that this configuration is somewhat better compared to this guide.

I got to fix my css for the <code></code> :-/

Mar 18, 2009 0

iPhone 3.0 highlights

- Cut, copy and paste
- Swedish keyboard (åäö)
- Tethering, use the iPhone as modem
- MMS (kind of useless but other non iPhone uses it)
- Spotlight

and much more.

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