🐳 Docker Hub and Uploading Images

Docker Hub is the official cloud-based registry where Docker users can store, share, and manage images publicly or privately. It allows developers to upload their Docker images and pull them from anywhere in the world.

You can think of it like GitHub for Docker images — instead of pushing code, you push container images.

🌐 What is Docker Hub

• Docker Hub is a central repository for Docker images.
• You can pull images to use (like nginx, mysql, ubuntu, etc.) or push your own custom images.
• It helps in team collaboration, version control, and easy deployment of containerized applications.

Examples:

• Public image → anyone can download (like nginx:latest)
• Private image → only you or your organization can access

⚙️ Step 1: Create a Docker Hub Account

1. Go to https://hub.docker.com
2. Click Sign Up and create a free account.
3. After registration, log in to Docker Hub.

🧩 Step 2: Log in to Docker from Terminal

Use your Docker Hub credentials to log in from your local machine:

docker login

It will ask for your Docker ID and password. If login is successful, you’ll see:

Login Succeeded

🏗️ Step 3: Tag Your Local Docker Image

Before pushing your image to Docker Hub, tag it properly with your Docker Hub username and repository name.

Example:

docker tag myapp:latest your-dockerhub-username/myapp:1.0

Explanation:

• myapp:latest → your local image name.
• your-dockerhub-username/myapp:1.0 → repository name with tag version.

The image must include your Docker Hub username before pushing.

☁️ Step 4: Push Image to Docker Hub

Now upload your image to Docker Hub:

docker push your-dockerhub-username/myapp:1.0

Docker will upload all layers of the image. Once completed, you’ll see it available in your Docker Hub account under Repositories.

🔍 Step 5: Verify Image on Docker Hub

1. Log in to hub.docker.com
2. Go to Repositories
3. You’ll see your uploaded image listed (e.g., myapp with tag 1.0).

Now anyone (or you) can pull it using:

docker pull your-dockerhub-username/myapp:1.0

🧹 Step 6: Manage Docker Images

You can push new versions of the same image with different tags:

docker tag myapp:latest your-dockerhub-username/myapp:2.0
docker push your-dockerhub-username/myapp:2.0

You can also delete old images directly from the Docker Hub web interface.