How it Works

If Pantheon used traditional architectures (e.g. shared hosting, VMs, or clusters) we'd never achieve our goals. "Hosting" is too slow, clunky and manual, even in the era of virtual machines. We needed something that could be fully automated via software, and could deliver breakthrough performance, scalability, and efficiency.

Instead of "hosting", we built a massive multi-tenant platform using containers on top of dedicated infrastructure. Watch this video to learn more about how Pantheon scales with containers.

Ok, that’s still a lot of buzzwords. How does the Pantheon Platform work in practice?

Runtime Matrix

The Edge - Caching and Load Balancing

The Edge is the exterior of Pantheon — the part that directly touches the public internet. The Edge has a built-in, ultra-fast cache that's automatically enabled for every site. It improves page load times for our customers and helps sites to cruise through viral traffic spikes without breaking a sweat.

The Edge also knows how to intelligently route and load-balance requests across the entire Runtime Matrix. When an end-user's browser wants a page that isn’t cached, or that can't be cached, the Edge routes the request to a container running the proper customer application.

Inside a Container

The essence of a runtime container is a highly tuned PHP-FPM worker and its connections to the outside world. Incoming requests come via an nginx web server which handles requests for static assets, and passes dynamic requests to PHP.

Runtime containers are "share nothing", but backing services (database, filesystem, etc.) are available via the Content Base. A control interface for developers to access a particular container directly exists via a special encrypted SSH interface, giving access to CLI tools like rsync and SFTP. It’s everything you need to power a site.

Charles Babcock editor-at-large at Information Week writes a detailed commentary about containers.

Read More >

Content Base

Backing Services

The application runtime is only half the equation. Websites depend on stateful data, namely their content. How do you effectively manage and scale database and file services? This is the Achilles heel of traditional hosting architecture, and something often glossed over in many 12-factor architectures.

We've broken through multiple technical barriers to achieve uniformity and scale for backing services across the entire platform.

Our Content Base is structured similarly to the Runtime Matrix. It’s N+1 redundant, scalable, completely automated, and leverages our containers technology to provide breakthrough value. In addition to the required services of Database, File System, and Version Control, it also provides pathways for optional enhancements, like Redis key/value cache, Apache Solr search, and more.

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The Pantheon File System

Our PFS (Pantheon File System) is a breakthrough in network-attached storage. It is backed by a self-healing elastic cluster architecture, and its advanced FUSE client rivals local on-disk filesystems for performance, thanks to a thoroughly modern leveldb caching layer.

The PFS is resilient to network disruptions, and because it's designed to handle content, it performs workflow operations at unbelievable speed by synchronizing metadata instead of hauling around actual binary content data.

Dashboard

The Dashboard is a real-time interface into Pantheon. It includes everything you need to build, launch and run sites. You can create new projects, manage team access, interface via SFTP or Git (version control), and track miscellaneous tools like backups. It also allows you to deploy and scale your sites.

You're not stuck with a web UI, either. Terminus, a command-line interface to the platform, lets you script and automate everything from imports to testing to go-live. The CLI allows you to leverage existing DevOps resources to move even faster with the Pantheon platform.