And this isn’t even about Red Hat.
Tools and technologies that Instagram uses:
Ubuntu 11.04
nginx
Amazon’s Route53 for DNS.
25+ Django app servers on high CPU Xtra-Large EC2 instances.
Gunicorn as their WSGI server.
Fabric to deploy in parallel to all machines.
3 12 PostgreSQL-server clusters on Xtra-Large memory instances.
EBS as a software RAID configuration.
Apache Solr for geo-search API.
6 memcached instances for caching.
Gearman task queue.