docker-cli

# Docker CLI Guide

Docker is a containerization platform that packages applications and dependencies into isolated containers. This guide provides essential workflows and quick references for common Docker operations.

## Quick Start

```bash
# Check Docker installation
docker --version

# Run your first container
docker run hello-world

# Run interactive container
docker run -it ubuntu bash

# Run container in background
docker run -d nginx

# List running containers
docker ps

# Stop a container
docker stop container_name
```

## Common Workflows

### Workflow 1: Build and Run an Application

```bash
# Create Dockerfile in your project directory
# Build image
docker build -t myapp:latest .

# Run container with port mapping
docker run -d -p 8080:80 --name myapp myapp:latest

# View logs
docker logs -f myapp

# Access container shell
docker exec -it myapp bash
```

### Workflow 2: Development with Hot Reload

```bash
# Run with volume mount for live code updates
docker run -d \
  -p 8080:80 \
  -v $(pwd)/src:/app/src \
  --name myapp-dev \
  myapp:dev

# Watch logs in real-time
docker logs -f myapp-dev

# Restart after configuration changes
docker restart myapp-dev
```

### Workflow 3: Multi-Container Application with Docker Compose

```bash
# Create docker-compose.yml with services
# Start all services
docker compose up -d

# View service logs
docker compose logs -f

# Scale a service
docker compose up -d --scale api=3

# Stop all services
docker compose down

# Stop and remove volumes
docker compose down -v
```

### Workflow 4: Push Image to Registry

```bash
# Login to registry
docker login

# Build and tag image
docker build -t myapp:latest .
docker tag myapp:latest username/myapp:v1.0.0
docker tag myapp:latest username/myapp:latest

# Push to registry
docker push username/myapp:v1.0.0
docker push username/myapp:latest
```

### Workflow 5: Debug Container Issues

```bash
# Check container status
docker ps -a

# View container logs
docker logs container_name

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