Flickr Platform

• PHP
• MySQL
• Shards
• Memcached for a caching layer.
• Squid in reverse-proxy for html and images.
• Linux (RedHat)
• Smarty for templating
• Perl
• PEAR for XML and Email parsing
• ImageMagick, for image processing
• Java, for the node service
• Apache
• SystemImager for deployment
• Ganglia for distributed system monitoring
• Subcon stores essential system configuration files in a subversion repository for easy deployment to machines in a cluster.
• Cvsup for distributing and updating collections of files across a network.

Flickr Architecture

• High Scalability: Flickr Architecture