What is Docker?

Docker is an open-source platform that allows developers to build, package, and run applications in isolated environments called containers. This technology simplifies application management and dependencies, ensuring consistency between development and production environments.

1. Docker Basic Concepts

a. Container

A container is an isolated unit that runs an application along with its dependencies. Unlike virtual machines (VMs), containers share the host kernel, making them more lightweight and efficient.

b. Image

An image is a template used to create a container. Images are read-only and can be distributed through Docker Hub or other registries.

2. Basic Docker Commands

a. Running a Docker Container

docker run -d --name my_container nginx

This command runs a container based on the nginx image in detached mode.

b. Viewing Running Containers

docker ps

Displays a list of currently running containers.

c. Stopping a Container

docker stop my_container

Stops the container named my_container.

d. Removing a Container

docker rm my_container

Deletes a stopped container.

e. Pulling an Image from Docker Hub

docker pull ubuntu

Pulls the ubuntu image from Docker Hub.