#Docker  #DevOps  
# Topic covered

Docker-Compose

  • DC makes it easier to configure and run applications made up of multiple containers
  • DC is a very handy tool to quickly get docker environment up and running.
  • It uses yaml files to store the configuration of all the containers

We can create some containers like: web app, postgres and redis and can establish an internal connection

Installation

sudo apt-get install docker-compose

# Check
docker-compose --version
docker-compose -v

V1 vs V2

# Old style (Compose V1)
docker-compose up

# New style (Compose V2).
docker compose up

Commands

# This will not build the image if it's already exists
docker-compose up

docker compose up -d
# Force to build the image
docker-compose build

docker-compose down
docker-compose config

# stops all the running containers without removing them.
docker compose stop
docker container stop <container id>

# removes all the containers.
docker compose rm

docker-compose up --build

Mini project - Mongodb and Node

DjRest-Adv

# Dockerfile

FROM python:3.7-alpine
MAINTAINER Hitman

ENV PYTHONUNBUFFERED 1

COPY ./requirements.txt /requirements.txt
RUN apk add --update --no-cache postgresql-client jpeg-dev
RUN apk add --update --no-cache --virtual .tmp-build-deps \
      gcc libc-dev linux-headers postgresql-dev musl-dev zlib zlib-dev
RUN pip install -r /requirements.txt
RUN apk del .tmp-build-deps

RUN mkdir /app
WORKDIR /app
COPY ./app /app

RUN mkdir -p /vol/web/media
RUN mkdir -p /vol/web/static
RUN adduser -D user
RUN chown -R user:user /vol/
RUN chmod -R 755 /vol/web

USER user

# docker-compose.yml

version: "3"

services:
  app:
    build:
      context: .
    ports:
      - "8000:8000"
    volumes:
      - ./app:/app
    command: >
      sh -c "python manage.py wait_for_db &&
             python manage.py migrate &&
             python manage.py runserver 0.0.0.0:8000"
    environment:
      - DB_HOST=db
      - DB_NAME=app
      - DB_USER=postgres
      - DB_PASS=supersecretpassword
    depends_on:
      - db

  db:
    image: postgres:10-alpine
    environment:
      - POSTGRES_DB=app
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=supersecretpassword

# django app inside app folder

# Run
docker-compose up