Docker architecture consists of the following components:
1. Docker Engine: This is the core component of Docker architecture and is responsible for running and managing containers. It is a lightweight runtime and packaging tool that allows you to create, deploy, and manage applications in a containerized environment. For example, Docker Engine can be used to run a web server in a container.
2. Docker Hub: This is a cloud-based registry service for managing and sharing Docker images. It is used to store and distribute Docker images.
3. Docker Compose: This is a tool for defining and running multi-container Docker applications. It uses a YAML file to configure the application’s services and then, with a single command, it creates and starts all the services from the configuration. For example, you can use Docker Compose to deploy a web application that consists of a web server, a database, and a caching layer.
4. Docker Swarm: This is a clustering and scheduling tool for Docker containers. It allows you to create a cluster of Docker nodes and then deploy and manage containers across the cluster. For example, you can use Docker Swarm to deploy an application across multiple nodes in a cluster.