Glossary of definitions

Docker Image

A docker image is a self-contained, layered archive containing an application and all of its OS dependancies and is the artifact of running a docker build. The image is what gets stored in a docker registry.


A Dockerfile is a lightweight DSL that contains all the commands a user could call on the command line to assemble an image in order to run an application.

ECS Agent

The ECS Agent is a component of Amazon Elastic Container Service (ECS) and is responsible for managing containers on behalf of Amazon ECS.

ECS Service

An ECS Service is a specified number (the “desired count”) of instances of an ECS Task simultaneously running in an Amazon ECS cluster.