Docker Basics in Linux

Get started with Docker in Linux, including installing Docker, managing containers, and using Docker Compose for multi-container applications.

Docker Basics in Linux  

Docker is a powerful tool for containerization. This guide covers getting started with Docker in Linux, including installing Docker, managing containers, and using Docker Compose for multi-container applications.

Installing Docker  

Using the Convenience Script  

Install Docker using the convenience script.

curl -fsSL https://get.docker.com -o get-docker.sh
sudo sh get-docker.sh

Installing from the Repository  

Set up the Docker repository.

sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

Install Docker Engine.

sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io

Managing Docker Containers  

Running a Container  

Use docker run to start a container.

docker run hello-world

Listing Containers  

List running containers.

docker ps

List all containers, including stopped ones.

docker ps -a

Stopping and Removing Containers  

Stop a running container.

docker stop container_id

Remove a stopped container.

docker rm container_id

Viewing Container Logs  

View logs of a container.

docker logs container_id

Using Docker Compose  

Installing Docker Compose  

Install Docker Compose.

sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose

Creating a Docker Compose File  

Create a docker-compose.yml file.

version: '3'
services:
  web:
    image: nginx
    ports:
      - "80:80"
  db:
    image: mysql
    environment:
      MYSQL_ROOT_PASSWORD: example

Running Docker Compose  

Start the application using Docker Compose.

docker-compose up

Stop the application.

docker-compose down

Conclusion  

Getting started with Docker in Linux involves installing Docker, managing containers, and using Docker Compose for multi-container applications. Practice these basics to effectively use Docker in your development and deployment workflows.