🚀 How to Create a Docker Image and Push It to DockerHub

Hey folks! 👋

In this post, I'll show you how to create a Docker image for a simple Machine Learning Python program and push it to DockerHub. 🚀

We’ll create a small ML project using the Iris dataset, logistic regression, and model saving.

Let’s get started! 🐳

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1️⃣ Create a Python Program

First, create a Python file named hello_world_ml.py with the following code:

from pandas import read_csv
from matplotlib import pyplot
from sklearn.linear_model import LogisticRegression
from sklearn.model_selection import train_test_split
import joblib

# Step 1: Load dataset
filename = "Iris.csv"
data = read_csv(filename)

# Step 2: Display data shape and preview
print("Shape of the dataset:", data.shape)
print("First 20 rows:\n", data.head(20))

# Step 3: Plot and save histograms silently
data.hist()
pyplot.savefig("histograms.png")
pyplot.close()

# Step 4: Plot and save density plots silently
data.plot(kind='density', subplots=True, layout=(3,3), sharex=False)
pyplot.savefig("density_plots.png")
pyplot.close()

# Step 5: Convert to NumPy array and extract features/labels
array = data.values
X = array[:, 1:5]  # Features
Y = array[:, 5]    # Labels

# Step 6: Split data into training and testing
test_size = 0.33
seed = 7
X_train, X_test, Y_train, Y_test = train_test_split(X, Y, test_size=test_size, random_state=seed)

# Step 7: Create and train logistic regression model
model = LogisticRegression(max_iter=200)
model.fit(X_train, Y_train)

# Step 8: Evaluate and display accuracy
result = model.score(X_test, Y_test)
print("Accuracy: {:.2f}%".format(result * 100))

# Step 9: Save the trained model to a file
joblib.dump(model, "logistic_model.pkl")

✅ Make sure you also have the Iris.csv dataset in the same folder.

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2️⃣ Create a Dockerfile

Next, create a file named Dockerfile in the same directory:

# Use a lightweight Python image
FROM python:3.12-slim

# Set the working directory
WORKDIR /app

# Copy all files into the container
COPY . .

# Install required libraries
RUN pip install pandas matplotlib scikit-learn joblib

# Define the command to run the app
CMD ["python", "hello_world_ml.py"]

Explanation:

• Base image: Python 3.12 slim.
• Working directory: /app.
• Installs all necessary Python libraries.
• Runs the hello_world_ml.py script when container starts.

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3️⃣ Build the Docker Image

Open your terminal, navigate to your project folder, and run:

docker build -t your-dockerhub-username/ml-docker-app:latest .

Example:

docker build -t myusername/ml-docker-app:latest .

✅ This command builds the Docker image and tags it.

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4️⃣ Login to DockerHub

If not already logged in, run:

docker login

Enter your DockerHub username and password when prompted.

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5️⃣ Push the Docker Image to DockerHub

After building and logging in, push the image:

docker push your-dockerhub-username/ml-docker-app:latest

Example:

docker push myusername/ml-docker-app:latest

✅ This uploads your image to your DockerHub repository.

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6️⃣ Pull and Run the Image from Anywhere

Anyone can now pull and run your ML app like this:

docker pull myusername/ml-docker-app:latest
docker run myusername/ml-docker-app:latest

🎯 The container will load the Iris dataset, train a logistic regression model, save graphs, and display model accuracy!

Example output:

Shape of the dataset: (150, 6)
First 20 rows:
    Id  SepalLengthCm  SepalWidthCm  PetalLengthCm  PetalWidthCm      Species
0   1            5.1           3.5            1.4           0.2  Iris-setosa
...
Accuracy: 94.00%

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🔥 Final Tips

• Add .dockerignore to avoid copying unnecessary files.
• Keep your Docker images lightweight.
• Make sure your Iris.csv is included while copying files (COPY . . does this).
• You can extend this with Flask API for serving predictions!

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📢 That's it!

You now know how to Dockerize a Machine Learning Python app and share it worldwide via DockerHub. 🐳✨

If you found this helpful, smash that ❤️ and share it with your dev friends!

Until next time, Happy Coding! 🚀