Re: [Cppcms-users] load balancing & scalability

[Artyom <art...@ya...>]

> 
> Can CppCMS be load balanced using cluster mechanism to
> handled high
> load user? What I mean here is some like horizontal
> scalability which
> I can add new server node to increase throughput.
> 

The simplest way is to put it behind a kind of reverse proxy. 
For example, lighttpd has load balancing option:

See: http://redmine.lighttpd.net/projects/lighttpd/wiki/Docs:ModFastCGI

So you transfer all requests to multiple FastCGI/SCGI backends for load-balancing.

Several points to be aware of:

- Cache - you need to work with distributed cache servers (tcp cache
  backend) so all network nodes would see same cache images.

  Of course cache-servers can be load balanced as well. So you 
  need to deploy several cache-servers and balance the load between
  them (quite simple, see 

  http://art-blog.no-ip.info/wikipp/en/page/ref_config#cache

- Sessions - best use encrypted or signed cookies that allow
  moving session storage to client side.

  Or you may deploy file based session storage over NFS or use
  similar same cache-servers for server side session storage

  http://art-blog.no-ip.info/wikipp/en/page/ref_config#sessions

  (CppCMS 1.x.x beta still has no sessions-over-tcp backend but will
  be back soon)

Artyom