docker--help.md

Docker is a platform that uses containers to make application development, deployment, and maintenance easier. Applications can run reliably across several contexts by using containers, which package them along with all of their dependencies. Scalability, resource efficiency, and management effectiveness are all increased by Docker's containerization technology, which makes application development, testing, and deployment fast and dependable. Learn more docs.docker.com/get-started/overview/

Youtube videos to learn more:

• # Docker in 100 Seconds - Fireship

Installation

Follow the link to Install Git for respective OS:

• Install for Linux
• Install for macOS
• Install for Windows

Login to Docker Hub hub.docker.com/

• Create a repo if needed

Jump to

• Docker Login
• Create Images
• Docker Hub
• Start Docker deamon
• Create Containers
• Simple Dockerfile for Nodejs server
• Simple Dockerfile for Python file

Docker commands --list

Docker Login

Provide username and password create in Docker Hub

docker login

docker logout

Create Images

Build an Image from a Dockerfile

docker build -t <image-name>

List local images

docker images

Delete an image

docker rmi <image-name>

Remove all unused images

docker image prune

Docker Hub

Publish an image to Docker Hub

docker push <username>/<image-name>

Search for other images

docker search <image-name>

Pull an image from Docker Hub

docker pull <image-name>

Start Docker deamon

docker -d

Create Containers

Create a container and run with the image

docker run --name <container-name> <image-name>

Run and push a container with container's port

docker run -p <host-port>:<container-port>

Start or Stop container

docker start <container-name>
docker stop <container-name>

Remove a stopped container

docker rn <container-name>

Open a shell inside running container

docker exec -it <container-name> sh

Inspect a running container

docker inspect <container-name>

List currently running containers

docker ps
docker ps -a

View container usage status

docker container status

Simple Dockerfile for Nodejs server

dockerfile

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

• The container must run in port 3000, to run the Nodejs server.

Simple Dockerfile for Python file

dockerfile

FROM python:latest
WORKDIR /app
COPY . /app
CMD ["python", "bmi.py"]

• The container must run in a interactive mode, to enter input values.