Wiki Upgrade

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So for those wondering what I've done with the wiki upgrade, I've made a simple diagram. As we get more hardware and resources you can see where we're headed as far as HA goes in our environment. I'm still trying to acquire a NAS or SAN for us, this will make what we need to do much easier. Also at the application layer once we get in a Xen environment we can add and remove app servers easily without having to expand the number of proxy servers we have until they get overloaded. I'm still experimenting with various things but right now app2 is our biggest SPOF[1] as it houses the wiki and shares it with app1. The proxy servers are using mod-rewrite [P] to proxy services. Basically the load balancer balances between proxy[1-2] and each proxy in turn proxies to app[1-2]. Instead of proxy1 -> app1, proxy2 -> app2. The proxy servers will also mount or contain copies of static content (like /extras, or favicon.ico)

There are many tweaks to be made to make this useful and hands-off HA, but this is a good first step for us. As always I'm interested in discussion so send it my way.

   -Mike



[1] Our load balancer may also be a SPOF, not sure.

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