docker

TLDR

Run container

$ docker run [image]

List containers

$ docker ps

Build image

$ docker build -t [name] [.]

Pull image

$ docker pull [image]

Stop container

$ docker stop [container]

Remove container

$ docker rm [container]

Execute command in container

$ docker exec -it [container] [bash]

docker is a platform for developing, shipping, and running applications in containers. It packages applications with dependencies into standardized units, ensuring consistency across different environments.
The tool has revolutionized application deployment and development workflows.

PARAMETERS

run [options] image

Create and start container

ps [-a]

List containers

build -t name path

Build image from Dockerfile

pull image

Pull image from registry

push image

Push image to registry

exec container command

Execute command in running container

logs container

Fetch container logs

stop container

Stop running container

start container

Start stopped container

rm container

Remove container

rmi image

Remove image

images

List images

RUN OPTIONS

-d, --detach

Run in background

-it

Interactive with TTY

-p host:container

Publish port

-v host:container

Mount volume

--name name

Assign name to container

-e var=value

Set environment variable

--rm

Automatically remove on exit

--network network

Connect to network

WORKFLOW

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

# Interactive container
docker run -it ubuntu bash

# With environment variables
docker run -e DATABASE_URL=postgres://... myapp

# With volume mount
docker run -v $(pwd):/app -w /app node npm install

# Build image
docker build -t myapp:latest .

# Push to registry
docker tag myapp:latest user/myapp:latest
docker push user/myapp:latest

# View logs
docker logs -f container_name

# Execute command
docker exec -it container_name bash

# Clean up
docker stop container_name
docker rm container_name
docker rmi image_name

DOCKERFILE

$ FROM node:18
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
EXPOSE 3000
CMD ["node", "server.js"]

COMMON OPERATIONS

$ # List running containers
docker ps

# List all containers
docker ps -a

# List images
docker images

# Remove all stopped containers
docker container prune

# Remove unused images
docker image prune

# System-wide cleanup
docker system prune -a

# Inspect container
docker inspect container_name

# Container stats
docker stats

CAVEATS

Requires Docker daemon running. Root or docker group membership needed. Networking can be complex. Volume permissions issues common. Images can be large. Security considerations for production. Different behavior on different operating systems.

HISTORY

Docker was created by Solomon Hykes at dotCloud in 2013, becoming open-source and revolutionizing application containerization.