I built the current web server infrastructure for 451 Research. It’s about 10 small VPS instances that are configured by Chef. App deployment is also handled by Chef.
Starting with a 10-year-old system, there were some tricky legacy migrations involved.
Web server: Nginx and Apache
Application servers: PHP and Unicorn
Database servers: MySQL, PostgreSQL, and Solr for search.
Server monitoring: Monit and Munin
Web applications: Wordpress, Joomla, and Redmine