Docker#
Docker is an open-source platform for developing, shipping, and running applications in isolated environments called containers. It enables developers to package applications with all necessary dependencies and configurations, ensuring consistency across different development and production environments.
👉 New to App-Generator? Sign IN with GitHub or Generate Web Apps in no time (free service).
Here are the main Docker concepts:
Containers
Containers encapsulate an application and its dependencies, ensuring consistency across multiple environments (development, testing, production).
Unlike virtual machines (VMs), containers share the host OS kernel and isolate the application processes, making them more lightweight and efficient.
Docker Engine
The core part of Docker, it is a client-server application with the following major components
Server (Docker Daemon): Runs the containers.
REST API: Interfaces the daemon with applications.
Client (Docker CLI): Enables users to interact with Docker.
Docker Images
Read-only templates that contain the application and its environment.
Built from Dockerfiles, which are scripts defining the image content.
Dockerfiles
Text documents containing instructions to assemble a Docker image.
Define the base image, application dependencies, configuration settings, and commands to run the application.
Docker Hub
A public registry where users can find and share Docker images.
Allows pulling pre-built images or pushing custom images.
Volumes
Persist data generated by and used by Docker containers.
Ensures data persistence beyond the container lifecycle.
Networks
Allow communication between containers and between containers and the host.
Provide isolation and segmentation of network traffic.