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Load balanced/redundant web infrastructure in geographically separated datacenters using LAMP

I'm in a company experiencing great growth and we need to expand our web infrastructure.  I'm currently setting up a LAMP instance in a single datacenter (DC1) that uses mod_proxy to load balance requests among 3 apache web servers, and it works very well.  I'm looking to grow our web infrastructure to a second data center for business continuation and spreading the request load among datacenters.  I just don' t know how to go about setting up a geographically separated load balanced system to host a mirrored dynamic webspace.

What I've thought about is duplicating the setup I have at DC1 to DC2, and setting up a round robin DNS that directs requests to each DC.

I'm really a newbie at setting up web infrastructure on this level, so any suggestions are welcome.  The constraint is that I must keep a linux/apache/mysql/php,perl setup.

Thanks.
Apache Web Server
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JWSmythe
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digibrad

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I'm thinking that I'm going to be doing a MySQL master/ro-slave setup.  We're not really heavy on write queries to the database, but very heavy on the read queries, so having a ro-slave take over isn't a big deal right now.  I'm running everything on virtual machine images stored on shared storage.  The idea is that I can ship over my webserver/mysql master images to DC2 and bring them online there to be up and running should I experience an extended outage.

Thanks for your answer, it was exactly the help I'm looking for.
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digibrad

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Thanks for your answer, it's exactly what I am looking for.
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JWSmythe

  No problem.  I like to share my experience here, to help folks like you out, so you don't have to reinvent the wheel every time. :)
Apache Web Server
Apache Web Server

The Apache HTTP Server is a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards. Typically Apache is run on a Unix-like operating system, but it is available for a wide variety of operating systems, including Linux, Novell NetWare, Mac OS-X and Windows. Released under the Apache License, Apache is open-source software.

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