How To Install Docker Compose on CentOS 8

Docker Compose is a tool for defining and running multi-container Docker applications. With Docker Compose, you use a YAML file to configure your application’s services. Then, with a single command, you create and start all the services from your configuration.

In this tutorial, we’ll show you how to install the latest version of Docker Compose on CentOS 8 and explore the basic Docker Compose concepts and commands.

Prerequisites

Step 1 — Install Docker Compose On CentOS 8

In order to get the latest release of Docker Compose, go to the Docker’s GitHub repository site.

01- Start by downloading the Docker Compose binary into the /usr/local/bin directory using the following curl command:

$ sudo curl -L "https://github.com/docker/compose/releases/download/1.25.4/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

02- Next, set the permissions to make the binary executable:

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

03- Then, verify that the installation was successful by checking the version:

$ sudo docker-compose --version
docker-compose version 1.25.4, build 4667896b

04- Furthermore, to run Compose as a non-root user, add your user to the docker group as below.

$ sudo usermod -aG docker $USER

Step 2 – Getting started with Docker Compose

In this section, we’ll show how to use Docker Compose to run a Nginx container and expose it on your host machine.

01- Create a new directory named nginx and move into it:

$ mkdir ~/nginx && cd ~/nginx

02- Next, create docker-compose.yml file in your new directory and add the following lines:

$ vi docker-compose.yml
version: '3'

services:   
   web:     
     image: nginx:latest
     ports:
       - "8000:80"

– The first line specifies the Compose file version. There are several different versions of the Compose file format with support for specific Docker releases. For full details, check Compose and Docker compatibility matrix.

In the second section of services, we are are going to define a service called web. When docker-compose is run, will create a separate container based on the latest official Nginx image and it will expose the port 80 on the container to port 8000 on the host machine.

03- After saving the file, start the Nginx container as a background process with the following command:

$ docker-compose up -d
Creating network "nginx_default" with the default driver
Pulling web (nginx:latest)...
latest: Pulling from library/nginx
fc7181108d40: Pull complete
d2e987ca2267: Pull complete
0b760b431b11: Pull complete
Digest: sha256:96fb261b66270b900ea5a2c17a26abbfabe95506e73c3a3c65869a6dbe83223a
Status: Downloaded newer image for nginx:latest
Creating nginx_web_1 ... done

– Now, to check if the container is running and up, use the below command:

$ docker-compose ps
   Name             Command          State          Ports
-----------------------------------------------------------------
nginx_web_1   nginx -g daemon off;   Up      0.0.0.0:8000->80/tcp

04- Finaly, open the url http:IP_Docker:8000 and you should see the below screen:

Uninstalling Docker Compose

If for any reason you want to uninstall Docker Compose you can simply delete the binary directory by typing the below command:

$ sudo rm -f /usr/local/bin/docker-compose

Conclusion

And that’s a wrap! You have successfully learnt how to install Docker Compose on CentOS 8 server and how to define and run your first container easily using a YAML file.

What’s Next? You might want to check the following guides:

• How To Install Portainer Web UI for Docker
• How To Remove all Unused Docker Images
• Learn How to stop and remove all Docker Containers?

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