Docker Overview: Architecture, Components, and Basic Usage

Docker is an open‑source container engine that builds on Linux Containers (LXC) to provide lightweight, isolated environments for applications.

The article first explains LXC concepts, then describes how Docker uses LXC under the hood and extends it with additional features such as image management, networking and resource control via namespaces and cgroups.

Key Docker components are introduced: Docker client, Docker daemon, Docker registry, graph driver, libcontainer, and the various drivers (graphdriver, networkdriver, execdriver) that implement storage, networking and execution.

A practical guide shows how to install Docker, query its version, pull and list images, run containers, attach to them, export/import images, and view logs, with example commands wrapped in yum install docker -y , docker version , docker pull alpine , docker run -it alpine sh , docker exec -it mynginx sh , and docker logs -f mynginx .

The article also compares Docker containers with virtual machines, highlights the advantages of containerization, and provides diagrams of Docker’s internal architecture.