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Darshan Vasani
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📘 Complete Docker Image Publishing CheatSheet 🐳🚀

#javascript #docker #devops #webdev

📘 Complete Docker Image Publishing CheatSheet 🐳🚀

🌐 What is a Docker Registry?

A Docker registry is a storage for Docker images 🗃️. You can:

  • ✅ Push your custom images to it
  • 📥 Pull images when needed
  • 🔐 Optionally set them private/public

🏠 Popular Registries:

  • 🐳 Docker Hub (hub.docker.com)
  • 🔐 GitHub Container Registry (ghcr.io)
  • ☁️ Google Artifact Registry / Amazon ECR / GitLab / Azure ACR

✨ Structure of Docker Image Name 

<registry>/<username>/<repo>:<tag>
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Part Example Meaning
Registry docker.io (default) Where image is stored 🌍
Username dpvasani56 Your DockerHub or GitHub ID 👤
Repo node-application Your app/project name 📦
Tag v1, latest Version tag 🏷️

🚀 Two Ways to Publish Docker Image to Docker Hub

📦 Step 0: Build the image 

docker build -t dpvasani56/node-application:v1 .
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🧭 Method 1: Manual Push to Docker Hub

✅ Step-by-step:

1️⃣ Login to Docker Hub

docker login
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🧠 Enter your Docker Hub username and password.

2️⃣ Push your image

docker push dpvasani56/node-application:v1
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✅ Image will now appear on your Docker Hub at:
📍 https://hub.docker.com/r/dpvasani56/node-application

3️⃣ Pull from any system

docker pull dpvasani56/node-application:v1
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🎯 Then run:

docker run -p 3000:3000 dpvasani56/node-application:v1
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🧠 Method 2: Push from GitHub via GitHub Container Registry (ghcr.io)

🔧 Step-by-step:

1️⃣ Create a GitHub repo

Name it like: node-application

2️⃣ Login to GitHub Container Registry

echo <GH_TOKEN> | docker login ghcr.io -u USERNAME --password-stdin
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💡 Use a Personal Access Token (PAT) from GitHub with write:packages permission.

3️⃣ Tag your image

docker tag node-application ghcr.io/dpvasani56/node-application:v1
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4️⃣ Push to GitHub Container Registry

docker push ghcr.io/dpvasani56/node-application:v1
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✅ Image is now available at:
🔗 https://github.com/dpvasani56/packages

📌 Tagging Summary 

# Tag for DockerHub
docker tag node-application dpvasani56/node-application:v1

# Tag for GitHub Registry
docker tag node-application ghcr.io/dpvasani56/node-application:v1
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🧼 Optional Cleanup 

docker image rm <image-name>
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Use this to save space once pushed.

🧠 Bonus: Automate with GitHub Actions

Use this snippet in .github/workflows/docker.yml:

jobs:
  push_to_registry:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Log in to GitHub Container Registry
        run: echo "${{ secrets.GH_PAT }}" | docker login ghcr.io -u dpvasani56 --password-stdin

      - name: Build and Push
        run: |
          docker build -t ghcr.io/dpvasani56/node-application:v1 .
          docker push ghcr.io/dpvasani56/node-application:v1
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✅ Set GH_PAT as a GitHub secret with correct permissions.

🔥 Quick Recap Table

Action Docker Hub GitHub Container Registry
Login docker login docker login ghcr.io
Tag dpvasani56/app:v1 ghcr.io/dpvasani56/app:v1
Push docker push dpvasani56/app:v1 docker push ghcr.io/dpvasani56/app:v1
Pull docker pull dpvasani56/app:v1 docker pull ghcr.io/dpvasani56/app:v1

🧾 Sample Push Command (Your Request) 

docker push dpvasani56/node-application:v1
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✅ This pushes your image to Docker Hub under your account.

🏷️ Step-by-Step: Tag & Push Docker Image to Docker Hub (dpvasani56/node-application)

Assume your image is locally named:

my-app
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And you want to push it as:
📦 dpvasani56/node-application

🔧 Step 1: Tag the Image

🏷️ Think of this as giving your image a Docker Hub label 🎫

docker tag my-app dpvasani56/node-application
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✅ This tags your image for Docker Hub upload.

✅ Optional: Add a Version Tag 

docker tag my-app dpvasani56/node-application:v1
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🎯 This is better for version control in CI/CD and releases.

🔐 Step 2: Login to Docker Hub 

docker login
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➡️ Enter Docker Hub credentials for dpvasani56.

📤 Step 3: Push the Image

👉 With version tag: 

docker push dpvasani56/node-application:v1
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👉 Or default (latest tag): 

docker push dpvasani56/node-application
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✅ Image now available at:
🔗 https://hub.docker.com/r/dpvasani56/node-application

📥 Step 4: Pull & Use It Anywhere 

docker pull dpvasani56/node-application:v1
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Run the app:

docker run -p 3000:3000 dpvasani56/node-application:v1
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📦 All Commands Recap 

# 🔨 Build your image
docker build -t my-app .

# 🏷️ Tag for Docker Hub
docker tag my-app dpvasani56/node-application:v1

# 🔐 Login to Docker Hub
docker login

# 📤 Push to Docker Hub
docker push dpvasani56/node-application:v1

# 📥 Pull from Docker Hub (anywhere)
docker pull dpvasani56/node-application:v1

# ▶️ Run it
docker run -p 3000:3000 dpvasani56/node-application:v1
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🧠 Helpful Tips

Command Use
docker images View tagged images locally 🗂️
docker rmi <image> Remove an image locally 🧹
docker ps View running containers 🚀
docker stop <id> Stop a container manually 🛑

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