Docker

Docker is a platform that allows developers to automate the deployment of applications inside lightweight, portable containers. Containers include everything needed to run an application, from the operating system to libraries, binaries, and configuration files.

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Docker containers provide consistency across multiple development, testing, and deployment environments.

Why Do We Use Docker?

Portability: Docker containers can run on any system that supports Docker, ensuring that your application behaves the same regardless of where it is deployed.
Isolation: Containers encapsulate all dependencies of an application, ensuring that each container runs in its own isolated environment without affecting other applications.
Scalability: Docker makes it easy to scale applications up or down by adding or removing containers as needed, helping to manage varying loads efficiently.

Basic Docker Commands

Here are some essential Docker commands to get you started:

To pull an image from Docker Hub:

docker pull <image-name>

To list available Docker images:

docker images

To run a Docker container:

docker run -d -p 80:80 <image-name>

-d: Runs the container in the background (detached mode).

-p 80:80: Maps port 80 on the host to port 80 on the container.

Best Practices For Building Docker Images

When creating Dockerfiles, following best practices ensures your images are efficient, secure, and maintainable. Here are some key tips:

Use slim or alpine versions of base images.

Dockerfile

FROM python:3.12.2-slim

Basic Commands

Build and tag a Docker Image:

docker build -t image-name .

docker login registry.example.com -u your_username -p your_personal_access_token

Push an Image to a Registry:

docker push <image-name>

Intro Pod