👤 About the Instructor

Hi, I’m Ayan Dutta, a Software Architect, Instructor, and Content Creator.
I create practical, hands-on courses on Java, Spring Boot, Debugging, Git, Python, and more.

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🌐 Connect With Me

• 💬 Slack Group: Join Here
• 📢 After joining, go to the #integration-testing-with-testcontainers-java-spring-boot channel
• 📧 Email: j2eeexpert2015@gmail.com
• 🔗 YouTube: LearningFromExperience
• 📝 Medium Blog: @mrayandutta
• 💼 LinkedIn: Ayan Dutta

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📺 Subscribe on YouTube

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📚 Explore My Udemy Courses

🧩 Java Debugging Courses with Eclipse, IntelliJ IDEA, and VS Code

Eclipse Debugging Techniques

Java Debugging With IntelliJ

Java Debugging with VS Code

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💡 Java Productivity & Patterns

IntelliJ IDEA Tips & Tricks

Creational Design Patterns

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🐍 Python Debugging Courses

Python Debugging With PyCharm

Python Debugging with VS Code

Python Debugging (Free)

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🛠 Git & GitHub Courses

GitHub Desktop Guide

Git & GitHub with Eclipse

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🐳 Preparing a Custom PostgreSQL Image on GHCR

These steps show how to prepare and test a custom PostgreSQL image in GitHub Container Registry (GHCR) to be used in Testcontainers.

🔐 Step 1: Generate a GitHub Personal Access Token (GHCR_PAT)

1. Go to: https://github.com/settings/tokens?type=beta
2. Click: Generate new token → Classic
3. Select scopes:
   • ✅ read:packages
   • ✅ write:packages
4. Copy the generated token and save it securely

You’ll use this token as the password when logging in to GHCR.

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🔧 Step 2: Tag and Push to GHCR

Using your own GitHub username:

# Pull the official Postgres image
docker pull postgres:15

# Tag the image
docker tag postgres:15 ghcr.io/<your-github-username>/approved-images/postgres:15
# Example:
docker tag postgres:15 ghcr.io/j2eeexpert2015/approved-images/postgres:15

# Login to GHCR
echo <GHCR_PAT> | docker login ghcr.io -u <your-github-username> --password-stdin
# Example:
echo <GHCR_PAT> | docker login ghcr.io -u j2eeexpert2015 --password-stdin

# Push to GHCR
docker push ghcr.io/<your-github-username>/approved-images/postgres:15
# Example:
docker push ghcr.io/j2eeexpert2015/approved-images/postgres:15

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🚫 Step 3: Test Access Without Authentication

To simulate an unauthenticated environment:

# Logout from GHCR
docker logout ghcr.io

# Remove local image
docker rmi ghcr.io/<your-github-username>/approved-images/postgres:15
# Example:
docker rmi ghcr.io/j2eeexpert2015/approved-images/postgres:15

# Attempt pull without auth
docker pull ghcr.io/<your-github-username>/approved-images/postgres:15
# Example:
docker pull ghcr.io/j2eeexpert2015/approved-images/postgres:15

✅ This pull should fail if the image is private, confirming access is restricted without credentials.