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Docker packages applications and their dependencies into portable, isolated containers that can run consistently across different environments.
Docker is a containerization platform that uses operating-system-level virtualization to package applications and their dependencies into lightweight, portable containers. First released in 2013 and developed by Docker, Inc., it enables software to run consistently across Linux, Windows, and macOS environments. Docker containers share the host operating system kernel, which generally makes them more resource-efficient than virtual machines while providing process, network, filesystem, and resource isolation through technologies such as namespaces, cgroups, and layered filesystems. Docker’s architecture includes the Docker daemon (dockerd), the Docker CLI, images, containers, services, and registries such as Docker Hub. Dockerfiles define how images are built, while Docker Compose simplifies the configuration and operation of multi-container applications. Docker Swarm provides clustering and service orchestration across multiple Docker engines, and Docker Volumes support persistent data beyond a container’s lifecycle. Docker Engine is Apache 2.0 licensed, while Docker Desktop has separate licensing restrictions for larger enterprises.
Docker packages applications and their dependencies into portable, isolated containers that can run consistently across different environments.
Containers share the host operating system kernel and use fewer resources than traditional virtual machines, allowing multiple containers to run on a single host.
Docker Engine consists primarily of the dockerd daemon, Docker CLI, container images, containers, services, and registries.
Dockerfiles define image contents, Docker Compose manages multi-container applications, and Docker Swarm provides clustering and orchestration capabilities.
Docker Volumes preserve data independently of containers, while registries such as Docker Hub distribute container images.
Docker supports Linux, Windows, and macOS; on macOS, containers run through a Linux virtual machine.
Docker Engine is licensed under Apache 2.0, while Docker Desktop includes additional components and enterprise licensing requirements.
The core Docker software that creates, runs, and manages containers.
An isolated, standardized runtime environment that packages an application with its dependencies.
A read-only template used to create Docker containers.
A text file containing instructions for building a Docker image.
The persistent dockerd process that manages containers and responds to Docker Engine API requests.
The command-line interface used to interact with Docker daemons and manage Docker resources.
A repository that stores and distributes Docker images, either publicly or privately.
A tool that defines and runs multi-container applications using YAML configuration files.
Docker’s native clustering and orchestration system for managing services across multiple Docker engines.
A storage mechanism that keeps application data independent of a container’s lifecycle.
Linux kernel features that isolate processes, networking, user identities, and mounted filesystems.
Linux kernel features that limit and monitor container resource usage such as CPU and memory.
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