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Jonathan Block, CTO at RockThePost.com, a crowdfunding company, has written a nice set of tips for smaller sites on how to scale a service on EC2 using a small two person development team.
Their service has a typical small scale structure:
- PHP's Zend Framework 2
- Two m1.medium for web servers
- ELB to split the load
- master/slave MySQL database
- Siege for load testing
The very sensible tips that can handle 30,000 concurrent users per web server: