Hi all,
I am not sure whether this problem is quite related to cakephp. But I
think here is a good place to ask for help. So I am very appreciate if
anyone could help me or give me any advices. If anyone met similar
problem, I will be very glad if we can discuss together.
Ok. Just breifly talk about my objective. I have a web app which is
built based on cakephp. Due to some reasons, I would like to add
another web server which will be running an identical web app and a
load balancer to dispatch the requests.
Environment:
All the things are running on different virtual machines
CentOS 5.3
XAMPP - Linux 1.7.1
- only run apache on two web servers
- only run mysql on database server
- only run apache on load balancer
Next is the configurations:
IP address:
- web server 1 : 10.10.77.222
- web server 2 : 10.10.77.223
- db server : 10.10.77.226
- load balancer: 10.10.77.123
And I modified the httpd.conf on the load balancer. I add the
following configurations:
<IfModule proxy_module>
ProxyRequests Off
<Proxy *>
AddDefaultCharset off
Order deny,allow
Allow from all
</Proxy>
ProxyVia On
</IfModule>
<Location /balancer>
SetHandler balancer-manager
Order deny,allow
Deny from all
Allow from 10.10
</Location>
<Location /status>
SetHandler server-status
Order deny,allow
Deny from all
Allow from 10.10
</Location>
<Proxy balancer://mycluster>
# cluster member 1
BalancerMember http://10.10.77.222:80 route=ws1
# cluster member 2
BalancerMember http://10.10.77.223:80 route=ws2
</Proxy>
ProxyPass /balancer !
ProxyPass /status !
ProxyPass / balancer://mycluster/ lbmethod=byrequests
# I am not using sticky session here because the sessions are stored
in the database.
ProxyPassReverse / http://10.10.77.222/
ProxyPassReverse / http://10.10.77.223/
ExtendedStatus On
After that, I start apaches, type in the load balancer's ip address in
my browser. The main page shows up and it works well. But there is
something wrong. I cannot login to the app anymore. I think there
maybe something wrong with the session but i am not sure.
I also tried with a sticky session, but it seems like the same
problem. I just add a RewriteRule on each web server. It looks like
RewriteRule .* - [CO=PHPSESSID:balancer.ws1:10.10.77.123]. It is
possible that I have a wrong configuration. I will be very glad if
anyone can correct me.
The tutorials I referred are:
- Apache mod_proxy balancing with PHP sticky sessions
(http://www.markround.com/archives/33-Apache-mod_proxy-balancing-with-
PHP-sticky-sessions.html)
- scaling drupal step two - sticky load balancing with apache
mod_proxy
(http://74.125.153.132/search?
q=cache:UKApdy_DQMgJ:www.johnandcailin.com/blog/john/scaling-drupal-
step-two-sticky-load-balancing-apache-modproxy+apache+load+balancer
+configuration&cd=10&hl=en&ct=clnk&gl=sg)
If anyone needs some more information, pls feel free to ask. Much
appreciate you helps.
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