Docker

Containers:

Containers are lightweight, portable, and self-contained environments that package application code, runtime, libraries, and dependencies. Docker uses containerization technology to isolate applications from the underlying infrastructure, enabling consistent and reliable deployments across different environments.

Docker Engine:

Docker Engine is the core component of Docker that provides the runtime environment for running containers. It includes the Docker daemon, responsible for managing containers, images, volumes, and networks, and the Docker CLI, used for interacting with the Docker daemon via commands.

Images:

Images are read-only templates used to create containers. A Docker image contains a snapshot of a filesystem, including application code, runtime dependencies, and configuration files. Developers can build custom images using Dockerfiles or pull pre-built images from Docker Hub, a public registry of Docker images.

Dockerfile:

A Dockerfile is a text file that contains instructions for building a Docker image. It defines the steps needed to assemble the image, including base image selection, package installation, environment setup, and application configuration. Dockerfiles enable developers to automate the image creation process and ensure reproducibility.

Docker Hub:

Docker Hub is a cloud-based registry service provided by Docker for storing and sharing Docker images. It hosts a vast collection of public images contributed by the community and official images maintained by Docker. Developers can push, pull, and manage Docker images using Docker Hub.

Containerization:

Containerization is the process of encapsulating applications and their dependencies into containers for efficient deployment and management. Docker's containerization technology enables developers to package applications as lightweight, portable, and isolated containers, ensuring consistency and compatibility across different environments.

Docker Compose:

Docker Compose is a tool for defining and managing multi-container Docker applications. It uses YAML files to define services, networks, and volumes for a Docker application, allowing developers to specify complex application architectures and dependencies with ease.

Docker Swarm:

Docker Swarm is a native clustering and orchestration tool for Docker containers. It allows administrators to create and manage a cluster of Docker hosts, known as a swarm, to deploy, scale, and manage containerized applications across multiple nodes in a distributed environment.

Docker Networking:

Docker Networking enables communication between containers running on the same host or across different hosts in a Docker Swarm cluster. Docker provides various networking drivers and plugins for creating virtual networks, connecting containers, and controlling traffic flow between services.

Docker Security: