📦 Docker Basics: Containers, Images, and Volumes#

# Check Docker version
docker --version

# Get help
docker help

🔧 Docker Image Commands#

Images are the building blocks of containers.

# Pull an image from Docker Hub
docker pull nginx

# List all images
docker images

# Build image from Dockerfile
docker build -t my-image .

# Tag an image
docker tag my-image myrepo/my-image:1.0

# Remove image
docker rmi image_id_or_name

🔧 Docker Container Commands#

Containers are running instances of images.

# Run a container
docker run -d -p 80:80 --name webserver nginx

# Run interactively with terminal
docker run -it ubuntu /bin/bash

# List running containers
docker ps

# List all containers (including stopped)
docker ps -a

# Stop a container
docker stop container_id_or_name

# Start a container
docker start container_id_or_name

# Restart a container
docker restart container_id_or_name

# Remove a container
docker rm container_id_or_name

# View container logs
docker logs container_id_or_name

# Execute a command inside container
docker exec -it container_id /bin/bash

🔧 Docker Volume Commands#

Volumes store persistent data used by containers.

# Create a volume
docker volume create my-volume

# List volumes
docker volume ls

# Inspect a volume
docker volume inspect my-volume

# Remove a volume
docker volume rm my-volume

🔧 Docker Clean-Up Commands (Free Up Space)#

Docker tends to accumulate unused data. Here’s how to clean it up.

# Remove all stopped containers
docker container prune

# Remove all unused images
docker image prune

# Remove all unused networks
docker network prune

# Remove all unused volumes
docker volume prune

# Remove everything (use with caution!)
docker system prune

# Remove everything including volumes (use with more caution!)
docker system prune -a --volumes

🔧 Docker Network Commands#

# List networks
docker network ls

# Inspect a network
docker network inspect bridge

# Create a new network
docker network create my-network

# Remove a network
docker network rm my-network

🔧 Docker Compose Commands (If you’re using docker-compose.yml)#

# Start all services defined in docker-compose
docker-compose up -d

# Stop all services
docker-compose down

# View logs
docker-compose logs

# Rebuild containers
docker-compose up --build

# Remove all stopped services, networks, volumes
docker-compose down --volumes --remove-orphans

Tips#

• Use docker stats to monitor container resource usage.
• Use docker inspect for deep info on containers/images.
• Use docker top container_id to see running processes.
• Use watch docker ps to see live updates of containers.