Day 16 : Docker for DevOps Engineers

Introduction :

👋 Welcome, DevOps enthusiasts community!! In the dynamic world of software development, the need for efficient and scalable processes is paramount. That's where Docker comes in – a powerful tool that has revolutionized the way DevOps engineers build, ship, and deploy applications. In this blog, we're diving into the world of Docker, exploring its benefits, use cases, and how it can supercharge your DevOps practices. So, grab your virtual hard hat and let's get started! 🚀

What is docker?

Docker is a software platform that allows you to build, test, and deploy applications quickly. Docker packages software into standardized units called containers that have everything the software needs to run including libraries, system tools, code, and runtime.

• docker file: A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image.

• docker images: A Docker image is a file used to execute code in a Docker container. Docker images act as a set of instructions to build a Docker container, like a template.

• docker container: A container is an isolated environment for your code. This means that a container does not know your operating system or your files. It runs on the environment provided to you by Docker Desktop.

  

Essential Docker Commands :

1. Installing Docker 🛠️

   • sudo apt-get update

   • sudo apt-get install docker-ce

2. Building Images 🏗️

   • docker build -t image_name:tag .

3. Running Containers 🚀

   • docker run -d -p host_port:container_port --name container_name image_name:tag

4. Viewing Containers 🕵️

   • docker ps (active containers)

   • docker ps -a (all containers)

5. Stopping and Removing Containers ⛔

   • docker stop container_id

   • docker rm container_id

6. Managing Images 🖼️

   • docker images (list images)

   • docker rmi image_id (remove image)

7. Interacting with Containers 📝

   • docker exec -it container_id /bin/bash (enter container)

8. Logs and Inspecting Containers 📋

   • docker logs container_id

   • docker inspect container_id

9. Cleaning House 🧹

   • docker system prune -a (remove all unused containers, networks, and images)

Tasks :

1. Use the docker run command to start a new container and interact with it through the command line.

   

2. Use the docker inspect command to view detailed information about a container or image.

   

3. Use the docker port command to list the port mappings for a container.

   

4. Use the docker stats command to view resource usage statistics for one or more containers.

   docker stats <container_name>

   

5. Use the docker top command to view the processes running inside a container.

   

6. Use the docker save command to save an image to a tar archive.

   

7. Use the docker load command to load an image from a tar archive.

   

Conclusion: 🎉

Docker stands tall as the lighthouse guiding modern DevOps practices, reshaping app development, deployment, and management paradigms. With its ability to ensure consistency, bolster efficiency, and amplify scalability, Docker empowers DevOps explorers to navigate the turbulent waters of software creation with confidence.