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Core concepts

Device

An internet-connected, single-board computer running balenaOS and provisioned with the balena platform.

Release

A snapshot of code collected into one or more Docker images.

Application

A set of releases and a set of devices, encompassing the code and history of the code that applies to a fleet.

Fleet

The set of devices belonging to an application.

Service

An independently deployable component of an application, packaged into a Docker image and run as a container.

Device supervisor

Balena's agent on the device, responsible for managing application updates and reporting device status.

BalenaOS image

A versioned build of the host OS, specific to an application and device type.

Base image

A specific combination of a Linux distribution and additional packages, used as the base operating environment for a service.