docker-docs

What is Docker

A platform for building, running and shipping applications

Sometimes application works in your local machine but it is not working in server or other system, below list might me the cause

One or more file missing
Software version mismatch
Different configuration setting

this were docker comes it into picture, with docker we can easily package out application everything it need and run it anywhere on machine which has docker

What is Container

An isolated environment for running an application Are lightweight Use Os of the host Start quickly Need less hardware Resources

Commands

Commands	Info
docker pull ubuntu	to pull the image from the docker hub
docker images ls	to show list of images
docker run ubuntu	to run the application
docker ps	to see the list running process
docker ps -a	to see all the stopped container as well
docker run -it ubuntu	to run container in interactive mode
docker start -i docker-id	to start container
docker image prune
docker container prune
docker image rm name
dokcer image rm id
docker logs id
docker logs --help
docker build -t react-app .

docker build -t react-app sh alpine has only shell not bash by default

docker image tag react-app:lastest react-app:1 docker image save -o react-app.tar react-app docker image load -i react-app.tar docker run -d react-app docker run -d --name bluestar react-app

docker run -d -p 3000:3000 --name bluestar react-app docker exec -- we can execute command on a running container docker exec bluestar ls docker exec -it bluestar sh docker stop bluestar docker remove bluestar docker ps -a | grep bluestar docker volume creeate app-data docker run -d -p 3000:3000 -v app-data:/app/data docker rm -f id docker cp id :/app/log.txt . docker cp secret.txt id:/app

docker run -d -p 3000:3000 -v $(pwd):app -- sharing source code with container docker container rm -f $(docker container ls -aq) --Remove all container

docker image rm -f $(docker image ls -q) -- Remove all images

docker-compose build docker-compose build --no-cache docker-compose up docker-compose up -d docker-compose down docker network ls docker-compose logs

Docker File

FROM node:14.16.0-alpine3.13

RUN addgroup app && adduser -S -G app app
USER app

WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . . 

EXPOSE 3001 

CMD ["npm", "start"]

Keywords in Docker file

FROM
WORKDIR
COPY
ADD
RUN
ENV
EXPOSE
USER
CMD
ENTRYPOINT

Docker Compose Yml File demo

version: "3.8"

services:
  web:
    build: ./frontend
    ports:
      - 3000:3000
    volumes:
      - ./frontend:/app
  web-tests:
    image: demo_web
    volumes:
      - ./frontend:/app
    command: npm test
  api:
    build: ./backend
    ports:
      - 3001:3001
    environment:
      DB_URL: mongodb://db/demo
    volumes:
      - ./backend:/app
    command: ./docker-entrypoint.sh
  db:
    image: mongo:4.0-xenial
    ports:
      - 27017:27017
    volumes:
      - demo:/data/db

volumes:
  demo: