Docker Container Fundamentals
A Docker container includes everything needed to run an application, including code, runtime, system tools, and system libraries. Containers are isolated from one another, providing consistent and reproducible environments for applications.
How does Docker differ from virtual machines (VMs)
While virtual machines emulate an entire operating system on top of a host OS, Docker containers share the host OS kernel, making them much more lightweight and faster to start. Containers require fewer system resources and provide better performance compared to VMs.
What 𝗣𝗿𝗼𝗯𝗹𝗲𝗺s 𝗦𝗼𝗹𝘃𝗲𝗱 𝗯𝘆 𝗗𝗼𝗰𝗸𝗲𝗿 ?
Building and Deploying an application is always a challenge for programmers. Specially if you're programming on different OS and deploying on server with different OS.- There's always a chance of human error causing our application to not work on remote servers.- This problem becomes even worse when we're working on real world application with tons of module, DB, third party integrations, environment specific configuration.- This is where docker enters into the picture:
𝗛𝗼𝘄 Docker 𝘄𝗼𝗿𝗸𝘀?
It uses a technology called "containerization" to achieve this. Containers are lightweight, standalone, and portable packages. With Docker, developers can create a container image that includes all the dependencies and configurations needed to run their application. Images are built from a set of instructions called Dockerfiles and can be version-controlled and shared across different environments. These images can be use to deploy the application on any machine or server that supports Docker.
𝗨𝘀𝗲 𝗼𝗳 𝗗𝗼𝗰𝗸𝗲𝗿?
It Simplifies the process of building and deploying applications, and to make it easier to move applications between different environments.- Docker can also help to improve the reliability and scalability of applications.- Use different versions of same application with affecting each other in same environment.
References:
[1] Introduction to Docker and Containerization
What's Docker & its importance; VMs vs. Containers; Docker's architecture basics
[2] Install Docker
Dive into Docker Images & Containers; Discover Docker Hub
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Basic commands to get started
[3] Working with Dockerfiles
Understand Dockerfile; Create & manage Dockerfiles; Learn important tags in Dockerfile; Build a quick image using Dockerfile
[4] Docker Volumes & Persistent Storage
Understand the importance of Volume; Learn to create it and mount in a container
[5] Docker Networking
Learn, why is it used; Different types of network; Hands on example of different network
[6] Docker Compose
What is docker compose & it's use; Important components of docker compose file; Create simple images; Add more complexity by adding multiple images through docker compose file
[7] Docker Best Practices
- Learn various best practices in regards with security, optimization when using docker in production environment.