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Docker Compose

In this article, we will discuss the Docker compose tool.

Purpose

Docker Compose is a tool for defining and running multi-container Docker applications. It allows you to define a set of services, networks, and volumes in a single file called a docker-compose.yml file, and then use a single command to start and manage all the containers defined in that file.

Install Docker

The first step is to create a Ubuntu virtual machine and install Docker.

Install Docker-Compose

Write the following command to install the docker-compose.

sudo apt  install docker-compose

Docker-Compose.Yml

Create a file docker-compose.yml with the following content: -

version: '3'

services:
  nginx:
    image: nginx:latest
    container_name: my_nginx
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./apps:/etc/nginx/apps:ro
    restart: always

In the above code, apps is the folder where you save docker-compose.yml.

Run The Complete Application

Use the following command: -

docker-compose up

Output

--Scale Option

The --scale option creates the replicas of the service defined in docker-compose.yml file. Consider the above docker-compose.yml file again.

version: '3'

services:
  nginx:
    image: nginx:latest
    container_name: my_nginx
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./apps:/etc/nginx/apps:ro
    restart: always

In the above file, the service name is nginx. To create the replica, we will use the following command: -

docker-compose up --scale nginx=3

Posted By -	Karan Gupta

Posted On -	Monday, December 25, 2023

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