The idea to modify mod_proxy.c is probaly the most convenient solution. Instead of configure backend machine from the ProxyPass setting, you may specifically assign it to the one in the cookie, which takes only a few lines of code to change --- well, plus extra steps to handle the cookie. ProxyPass is processed at the URL translation phase. If the same cookie is used for other purposes such as access control then there is no cost at all. (sorry, this is in the c API, kind of OT.)
Peter Bi > Hello, > > I'd like to know if it is possible to use mod_proxy as a sticky session > manager. Basically, I'd like to put mod_proxy behind the load balancer and > allow the proxy servers to talk to the mod_perl servers. Unfortunately, the > load balancer does not allow for "sticky" sessions and only bounces the user > round-robin style. I am playing with the idea of sending a cookie down to > the client and using it to stick a user to a particular mod_perl server, but > I'd like mod_proxy to figure it out which server and send the user to the > defined machine. I'd also like to enable a "checking" mechanism to > determine if a mod_perl server is up before the user is sent to the location > specified in the cookie. If the machine that the client is stuck to is > down, I'd like to reroute. > > I know high powered load balancers do this already, but I'd like to explore > dedicating a few medium sized servers to do as there is surplus of these and > f5's cost $$$. I apologize in advance if this is a bit off topic! > > Thanks, > > Al > > > ********************************************************************** > This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom they > are addressed. If you have received this email in error please notify > the system manager. > > This footnote also confirms that this email message has been swept by > MIMEsweeper for the presence of computer viruses. > > www.mimesweeper.com > ********************************************************************** >
