[Linux] Bash docker uso: Manage containerized applications

Overview

The docker command is a powerful tool used to manage containerized applications. It allows users to create, deploy, and run applications in containers, which are lightweight, portable, and self-sufficient environments that include everything needed to run a piece of software.

Usage

The basic syntax of the docker command is as follows:

docker [options] [arguments]

Common Options

Here are some common options you can use with the docker command:

• run: Create and start a container.
• ps: List running containers.
• images: List available images on the local machine.
• pull: Download an image from a Docker registry.
• build: Build an image from a Dockerfile.
• exec: Run a command in a running container.
• stop: Stop a running container.

Common Examples

1. Running a Container To run a simple web server using an Nginx image:

   docker run -d -p 80:80 nginx
   

2. Listing Running Containers To see all currently running containers:

   docker ps
   

3. Pulling an Image To download the latest Ubuntu image from Docker Hub:

   docker pull ubuntu
   

4. Building an Image To build an image from a Dockerfile in the current directory:

   docker build -t my-image .
   

5. Executing a Command in a Container To open a bash shell in a running container:

   docker exec -it <container_id> bash
   

6. Stopping a Container To stop a running container:

   docker stop <container_id>
   

Tips

• Always use the -d option with run to run containers in detached mode for background execution.
• Use docker-compose for managing multi-container applications more easily.
• Regularly clean up unused images and containers with docker system prune to free up space.
• Tag your images with meaningful names and versions to keep track of different builds.