Heroku

Instant Deployment

Deploying an app is simple and easy. No special tools needed, just a plain git push. Deployment is instant, whether your app is big or small.

Continuous Deployment

Easily create testing, staging, and production versions of your app and deploy to and between them instantly. The dyno manifold insures all parts of your app are updated and bounced gracefully, routing continues seamlessly, and traffic is held for data migrations by custom maintenance controls.

Poka-yoke (ポカヨケ)

Move quickly and with confidence: Heroku follows a poka-yoke (mistake-proof) design philosophy, including role-based permissions, integrity checks during push, and robust release management and rollback controls. If in doubt, watch every detail of the deployment process in real-time with Logplex.

Add-on Resources

Instantly provision and integrate third party services with one click. Heroku's large catalog of third party add-on services is constantly growing, and includes services like databases, caching, monitoring, performance management, email, transcoding, search, billing, and many more.

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Per-Deploy Config Variables

Store credentials to external services like S3 or Twitter in config vars, exposed to your app as environment variables. Per-deploy environment variables are more secure and provide the flexibility to use different end-points for development, staging, and production.

Custom Services

Roll your own custom service (e.g. MySQL running on Amazon's EC2) just by adding its access credentials to your app's config vars. They will be available as environment variables to all dynos.

Control Surfaces

Heroku provides the following control surfaces for managing your app and its operations, all available as a command-line interface (CLI), web console, or full REST API.

Deployment and Release Management

Deploy code, view and manage a complete audit log of all changes, and rollback instantly to any version.

Add-ons and Config Vars

Add, remove, upgrade, and downgrade connected resources on the fly via add-ons, and manage per-deploy config variables for external resources.

Collaboration

Manage sharing, deployment, and billing permissions via role-based access control.

Scaling & Process Management

Independently scale each part of your app, inspect individual processes, and run any one-off command or interactive console.

Routing

Fine-grained control of DNS, custom domains, SSL, maintenance mode, and error handling.

Logging and Visibility

Full visibility into your app's operations with real-time logging, process status inspection, and an audit trail of all releases.

Total Visibility

Heroku's Logplex provides an unprecedented level of visibility into your app's operations, acting as an aggregation point for all logging activity across the platform.

Full Logging

See all logging output from every component of your app and each dyno, and output from every piece of the Heroku platform as it deploys your app, manages your dynos, and handles HTTP requests.

Process Status

Inspect the status of all app dynos across the platform. Watch the dyno manifold bring dynos up and down and keep them running, all in real-time.

Advanced Use

Filter logs by component or platform layer, or tail your logs in real-time, all from the command line.

Extensible

Connected resources can channel logs into your log stream (such as system logs from the Heroku PostgreSQL add-on), and syslog drains can send your logs to an external service or custom log archival location.

Scaling

With full control, instant spin-up, infinite capacity, and independent scaling for each component of your app, Heroku offers the most advanced and powerful web scaling platform to date.

Dynos

Forget servers, instances, and VMs. Focus on processes. Dynos are fully-isolated, erosion-resistent processes running on and kept alive by the dyno manifold. Dynos receive web requests from routing, connect to app resources via environment variables, and write output to Logplex.

Process Types

Define your app's parts with a Procfile, then scale the dynos for each component independently (web, workers, and more). This extremely powerful process model allows apps to scale without constant re-architecting.

Routing

Incoming web traffic is automatically routed to web dynos, with intelligent distribution of load instantly as you scale. Rich APIs allow fine-grained control of DNS, domains, SSL, maintenance, and error handling.

Relax

Once you've pushed code and scaled your dynos, Heroku takes full responsibility for your app's health. Entrust the dyno manifold to ensure your app is running the right number of healthy dynos at all times.

Isolation

Each dyno is completely isolated (using LXC OS-level virtualization), providing a secure and performance-consistent environment. Dynos can't run out of memory or be adversely affected by other processes, including one-off administrative processes.

Erosion-resistance

Heroku takes care of security issues, OS patching, library updates, shifting dependencies, crashing processes, memory leaks, and even hardware failure, keeping your dynos running throughout. Web apps are continually subject to extreme erosive forces, but Heroku's architecture provides strong resistance, keeping apps running unattended literally for years.

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