In a new post to his blog today Gonzalo Ayuso offers some tips for those out there wanting to cluster their PHP applications effectively.

Sometimes a web server and a database is fair enough to meet our project requirements. But if the project scales we probably need to think in a clustered solution. This post is an attempt at being an unsorted list of ideas working with clustered PHP applications. Maybe more than a list of ideas is a list of problems that you will face when swapping from a standalone server to a clustered server.

He touches on a few different topics you might need to consider:

• consistency in source code
• writing to the file systems
• deployment problems
• authentication/authorization issues
• handling sessions/logs/cache files