Docker Hub

Build and push Docker images to tertiaryinfotech on Docker Hub. Auto-generates a Dockerfile if one doesn’t exist by detecting the project type.

Command

/docker-hub or docker-hub

Navigate

Docker & Deployment

Keywords

docker hub, docker push, docker build, docker image, dockerfile, container, containerize, push image, docker deploy, docker hub push, tertiaryinfotech, build image, docker registry

Description

Build and push Docker images to Docker Hub under the tertiaryinfotech organization. Automatically detects the project type, generates a Dockerfile if missing, builds the image, and pushes it to https://hub.docker.com/repositories/tertiaryinfotech.

Execution

This skill runs using Claude Code with subscription plan. Do NOT use pay-as-you-go API keys. All AI operations should be executed through the Claude Code CLI environment with an active subscription.

Response

I’ll help you build and push your Docker image to Docker Hub!

The workflow includes:

Instructions

When executing /docker-hub, follow this workflow:

Phase 1: Pre-flight Checks

1.1 Verify Docker CLI

docker --version

If Docker is not installed, inform the user and stop. Provide installation link: https://docs.docker.com/get-docker/

1.2 Verify Docker Daemon

docker info > /dev/null 2>&1

If the daemon is not running, inform the user:

Docker daemon is not running. Please start Docker Desktop or the Docker service.

1.3 Verify Docker Hub Authentication

docker login --username tertiaryinfotech

If not logged in, prompt the user to authenticate. The push target is always the tertiaryinfotech account.

1.4 Determine Image Name

PROJECT_NAME=$(basename "$(pwd)")
IMAGE_NAME="tertiaryinfotech/$PROJECT_NAME"
echo "Image will be pushed as: $IMAGE_NAME:latest"

The image name is always tertiaryinfotech/<folder-name>. The tag defaults to latest unless the user specifies otherwise.

Phase 2: Dockerfile Detection & Generation

2.1 Check for Existing Dockerfile

ls Dockerfile 2>/dev/null

If Dockerfile exists: Skip to Phase 3.

If Dockerfile does NOT exist: Detect the project type and generate an appropriate Dockerfile.

2.2 Detect Project Type

Check for these files in order to determine the project type:

2.3 Generate Dockerfile

Based on the detected project type, generate a production-ready Dockerfile following these best practices:

• Use official base images with specific version tags (not latest)
• Multi-stage builds where applicable to minimize image size
• Non-root user for security
• Copy dependency files first, install, then copy source (layer caching)
• Use .dockerignore to exclude unnecessary files

Node.js Example (Express/generic):

FROM node:20-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY . .

FROM node:20-alpine
WORKDIR /app
RUN addgroup -S appgroup && adduser -S appuser -G appgroup
COPY --from=builder /app .
USER appuser
EXPOSE 3000
CMD ["node", "index.js"]

Node.js Example (Next.js):

FROM node:20-alpine AS deps
WORKDIR /app
COPY package*.json ./
RUN npm ci

FROM node:20-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

FROM node:20-alpine
WORKDIR /app
RUN addgroup -S appgroup && adduser -S appuser -G appgroup
COPY --from=builder /app/.next ./.next
COPY --from=builder /app/public ./public
COPY --from=builder /app/node_modules ./node_modules
COPY --from=builder /app/package.json ./
USER appuser
EXPOSE 3000
CMD ["npm", "start"]

Python Example (pip):

FROM python:3.12-slim AS builder
WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir --prefix=/install -r requirements.txt

FROM python:3.12-slim
WORKDIR /app
RUN useradd -r -s /bin/false appuser
COPY --from=builder /install /usr/local
COPY . .
USER appuser
EXPOSE 8000
CMD ["python", "main.py"]

Python Example (uv/pyproject.toml):

FROM python:3.12-slim
WORKDIR /app
COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv
COPY pyproject.toml uv.lock* ./
RUN uv sync --frozen --no-dev
COPY . .
RUN useradd -r -s /bin/false appuser
USER appuser
EXPOSE 8000
CMD ["uv", "run", "python", "main.py"]

Go Example:

FROM golang:1.22-alpine AS builder
WORKDIR /app
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 GOOS=linux go build -o /app/main .

FROM alpine:3.19
WORKDIR /app
RUN adduser -D -s /bin/sh appuser
COPY --from=builder /app/main .
USER appuser
EXPOSE 8080
CMD ["./main"]

Static Site Example (nginx):

FROM nginx:alpine
COPY . /usr/share/nginx/html
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]

Rust Example:

FROM rust:1.77-slim AS builder
WORKDIR /app
COPY Cargo.toml Cargo.lock ./
COPY src ./src
RUN cargo build --release

FROM debian:bookworm-slim
WORKDIR /app
RUN useradd -r -s /bin/false appuser
COPY --from=builder /app/target/release/* .
USER appuser
EXPOSE 8080
CMD ["./app"]

Java (Maven) Example:

FROM maven:3.9-eclipse-temurin-21 AS builder
WORKDIR /app
COPY pom.xml .
RUN mvn dependency:go-offline
COPY src ./src
RUN mvn package -DskipTests

FROM eclipse-temurin:21-jre
WORKDIR /app
RUN useradd -r -s /bin/false appuser
COPY --from=builder /app/target/*.jar app.jar
USER appuser
EXPOSE 8080
CMD ["java", "-jar", "app.jar"]

Ruby Example:

FROM ruby:3.3-slim AS builder
WORKDIR /app
COPY Gemfile Gemfile.lock ./
RUN bundle install --without development test

FROM ruby:3.3-slim
WORKDIR /app
RUN useradd -r -s /bin/false appuser
COPY --from=builder /usr/local/bundle /usr/local/bundle
COPY . .
USER appuser
EXPOSE 3000
CMD ["ruby", "app.rb"]

Adapt the generated Dockerfile to match the specific project (e.g., check package.json for the start script, detect the main entry file, check for framework-specific build commands).

2.4 Generate .dockerignore (if missing)

If no .dockerignore exists, generate one appropriate for the project type:

node_modules
.git
.gitignore
.env
.env.*
*.md
.DS_Store
.vscode
.idea
__pycache__
*.pyc
.pytest_cache
target
dist
build
.next

Phase 3: Build Image

PROJECT_NAME=$(basename "$(pwd)")
docker build -t tertiaryinfotech/$PROJECT_NAME:latest .

If the build fails:

1. Read the error output carefully
2. Fix the Dockerfile if the issue is in the generated Dockerfile
3. If the issue is in the user’s code, report the error and suggest fixes
4. Retry the build after fixing

Phase 4: Push to Docker Hub

PROJECT_NAME=$(basename "$(pwd)")
docker push tertiaryinfotech/$PROJECT_NAME:latest

Always push to tertiaryinfotech. This is hardcoded and should never be changed.

If push fails due to authentication:

docker login --username tertiaryinfotech

Then retry the push.

Phase 5: Verify

1. Confirm the push succeeded from the command output
2. Print the Docker Hub URL:

PROJECT_NAME=$(basename "$(pwd)")
echo "Image pushed successfully!"
echo "Docker Hub: https://hub.docker.com/r/tertiaryinfotech/$PROJECT_NAME"
echo "Pull command: docker pull tertiaryinfotech/$PROJECT_NAME:latest"

Capabilities

• Detect project type automatically (Node.js, Python, Go, Java, Rust, Ruby, static sites)
• Generate production-ready Dockerfiles with multi-stage builds
• Generate .dockerignore for clean builds
• Build and tag images for tertiaryinfotech organization
• Push images to Docker Hub
• Support for custom tags (defaults to latest)
• Non-root user in generated Dockerfiles for security
• Layer caching optimization in generated Dockerfiles

Notes

• All images are pushed to the tertiaryinfotech Docker Hub account
• Image name is derived from the current folder name: tertiaryinfotech/<folder-name>
• Default tag is latest — user can specify a custom tag if needed
• Docker Desktop or Docker daemon must be running before using this skill
• If DOCKER_USERNAME or DOCKER_PASSWORD environment variables are set, they can be used for non-interactive login