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Harikrishnan N
Harikrishnan N

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Docker Image creation and pushing to DockerHub (Step-by-Step!) 🐳

#docker #devops #programming #learning

Hey Devs! 👋
In this post, let’s learn how to create your own Docker image and upload it to DockerHub like a pro! 🐳
I’ll keep it super simple — plus, I’ll tell you where you can add screenshots to make the post even cooler!

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🛠️ Step 1: Create Your Project

👉 Start with a simple app/project.
Example structure:

/my-app
 ├── app.py
 └── requirements.txt
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🐳 Step 2: Create a Dockerfile

Inside your project folder, create a file named Dockerfile (no extension).
Example Dockerfile:

# Use an official Python image
FROM python:3.11-slim

# Set working directory
WORKDIR /app

# Copy app files
COPY . .

# Install dependencies
RUN pip install -r requirements.txt

# Run the app
CMD ["python", "app.py"]
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🏗️ Step 3: Build the Docker Image

Now, let’s build your image! Run this in your terminal:

docker build -t your_dockerhub_username/your-image-name:tag .
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Example:

docker build -t SysSyncer/hello-world-py:latest .
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🕵️‍♂️ Step 4: Verify Your Image

Check if your image is created:

docker images
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🔐 Step 5: Login to DockerHub

If you haven’t already, login to your DockerHub account:

docker login
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It will ask for your username and password.

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📤 Step 6: Push the Image to DockerHub

Now push your image to the cloud!

docker push your_dockerhub_username/your-image-name:tag
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Example:

docker push SysSyncer/hello-world-py:latest
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🎉 Step 7: Done! View Your Image on DockerHub

Go to https://hub.docker.com/ and you’ll see your freshly pushed image under Repositories!

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📋 Full Command Summary

# Build
docker build -t your_dockerhub_username/your-image-name:tag .

# Check Image
docker images

# Login
docker login

# Push
docker push your_dockerhub_username/your-image-name:tag
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⚡ Bonus Tip: Tagging Latest

Want your users to always get the latest version?
Add another tag:

docker tag your_dockerhub_username/your-image-name:v1 your_dockerhub_username/your-image-name:latest
docker push your_dockerhub_username/your-image-name:latest
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🎯 Wrapping Up

And that’s it, champ! 🏆
You just built and published your first Docker image to DockerHub!
Imagine millions of servers now being able to pull and run your image with just:

docker pull your_dockerhub_username/your-image-name:tag
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Pretty cool, right? 😎🐳

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