Docker-decompose tool is commonly used to configure multiple container-based Docker applications. 

Let's we can say that Docker-compose is a command-line tool that helps to deploy multiple containers and Docker applications by using a just single command. 

Using the Docker-compose you can include the Docker containers into a docker-compose.yml file and mention all container services or configurations that are necessary for an application. This tool can be used in the development, testing, and production environment, apart from all of these facts it also helps in Continuous Integration workflow.

Here at LinuxAPT, as part of our Server Management Services, we regularly help our Customers to perform related Docker Compose queries.

In this context, we shall look into the process of installing the Docker-compose on CentOS 8 system.

Also, you will learn how you can use and configure it on your system through the command-line.

How to install Docker-decompose on CentOS 8 ?

Apply the following methods to install the Docker-compose on your CentOS 8 system. 

1. Install Docker-compose using Python-pip tool

Docker-compose can be installed on CentOS 8 system by using the python-pip tool. 

Use the following commands, if you want to install Docker-decompose through this method:

$ sudo yum install epel-release
$ sudo yum install python-pip
# pip install docker-compose
# docker-compose --version

2. Install Docker-compose from the GitHub repository

To install Docker-decompose by using the curl command, you need to execute the following command to install curl on CentOS 8 if it is not already installed:

$ sudo dnf install curl -y

Now, download the Docker-compose binary from GitHub by using the curl command as follows:

$ sudo curl -L "https://github.com/docker/compose/releases/download/1.27.4/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

Use the below-mentioned command to set permissions on a binary executable file:

$ sudo chmod +x /usr/local/bin/docker-compose

To show the Docker-compose version which is installed on your CentOS 8 system, type the following command:

$ docker-compose –version

Now, the Docker-compose has been successfully installed on CentOS 8. In the rest article, we are explaining some set of commands that will help you in using the docker-compose tool.

How to use Docker-compose on CentOS 8?

All configurations about the containers-based services and container images are defined in the 'docker-compose.yml' file. 

i. Here, we are pulling container images of WordPress and MySQL by using the following commands:

$ sudo docker pull wordpress
$ sudo docker pull mysql
$ sudo docker image ls

ii. Now, create a new directory with the name 'wordpress-site' and navigate into it as follows:

$ mkdir wordpress-site
$ cd wordpress-site/

iii. Here, create a docker-compose file ‘docker-compose.yml’ and paste the following code in this file:

version: '3.0'
services:
  webserver:
    image: wordpress
    container_name: wp_web
    ports:
      - 8080:80
    links:
      - dbserver:mysql
    environment:
      WORDPRESS_DB_PASSWORD: 6zcznAEjLWp79P
  dbserver:
    image: mysql:latest
    container_name: wp_db
    environment:
      MYSQL_ROOT_PASSWORD: bgdderAEjLWp79P

In the above file, two different container services are defined such as 'webserver' and 'dbserver'. We have also defined container images and then mentioned the WordPress and dbserver passwords.

iv. Now, deploy these containers by running the below-mentioned command as the root user:

# docker-compose up

v. Now, browser the WordPress site URL:

http://{docker_host_ip}:8080

vi. To start and stop the containers, use the following commands respectively:

# docker-compose start
# docker-compose stop

vii. To explore more about the Docker-compose usage, use the following command:

$ docker-compose --help

[Need help in setting up Docker Compose on your Linux Server ? We can help you. ]