Hey DevOps Enthusiasts! 🌟
Welcome back to #90DaysOfDevOps. Today is extra special because we're diving into a hands-on Docker project. Ready to containerize a web application? Let's get started! 😍
What is Docker?
🐳 Docker is an incredible tool that simplifies the process of running applications in isolated environments called containers. These containers package everything an app needs to run - from code and runtime to libraries and system tools. This eliminates the "it works on my machine" problem and ensures consistent behavior across different environments.
Introducing the Dockerfile 📜
A Dockerfile is like a recipe for creating a Docker container. It contains a set of instructions to build a container image. Let's break it down with emojis! 🎉
🏗️ Choose a Base Image: The Dockerfile starts with selecting a base image, which serves as the foundation. For example, for a web app, we might choose a Node.js or Python image.
📦 Add Dependencies: We copy our app's code and dependencies into the container. This might include installing libraries, setting environment variables, and more.
🚀 Startup Commands: We define what commands should run when the container starts. This could be starting a web server, running migrations, etc.
Let's Get Our Hands Dirty! 👩🍳👨🍳
Task 1: Create a Dockerfile
Here's a simple Dockerfile for a Python web app:
Task 2: Build and Run the Container
Open a terminal and navigate to the directory containing your Dockerfile.
Build the Docker image using the following command:
Run the container based on the image:
Task 3: Verify the App
Open your web browser and go to
http://localhost:8000. Voilà! You should see your Python web app up and running.
Task 4: Push to Docker Hub
Create an account on Docker Hub, if you don't have one.
Use the command docker login to log in your Dockerhub
Add your credentials
Tag your image to match your Docker Hub repository
Push the image to Docker Hub:
Conclusion
Congratulations! 🎉 We've successfully created a Dockerfile, built a Docker image, and ran a container for a simple web application. This hands-on experience will be incredibly valuable as you continue your DevOps journey. Keep experimenting and learning! 🌟
Feel free to share your progress and any questions you have. Let's keep the momentum going in #90DaysOfDevOps! 🚀
Happy coding! 💻🔧