Easy Steps To Set up Docker Compose on AlmaLinux 9

In this guide, we will walk you through the process of how to Set up Docker Compose on AlmaLinux 9. Docker Compose is a powerful tool for managing multi-container Docker applications. It simplifies the deployment and orchestration of applications that consist of multiple microservices, allowing each service to reside in its own container and be managed easily. Setting up Docker Compose on AlmaLinux 9 allows you to define and manage your application’s services, networks, and volumes in a single docker-compose.yml file.

Now, let’s dive into the steps required to Set up Docker Compose on AlmaLinux 9. This guide is brought to you by Orcacore.

Before we begin, ensure you have the following prerequisites in place:

• You should be logged in to your AlmaLinux 9 server as a non-root user with sudo privileges. If you haven’t already configured this, you can follow our guide on Initial Server Setup with AlmaLinux 9.
• Docker must be installed on your server. If you haven’t installed Docker yet, follow our guide on How To Install Docker on AlmaLinux 9.

With these prerequisites addressed, let’s proceed with the following steps to Set up Docker Compose on AlmaLinux 9:

Step 1. Install Docker Compose on AlmaLinux 9

First, verify your Docker installation by checking its version:

docker --version

Download Docker Compose Binary

Next, you need to download the Docker Compose binary. Visit the GitHub Docker Compose release page to find the latest version. Use the curl command to download the appropriate binary package:

sudo curl -L "https://github.com/docker/compose/releases/download/v2.17.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

This command downloads the Docker Compose binary package to the /usr/local/bin directory. Make sure to replace v2.17.2 with the latest available version from the GitHub releases page.

Set Correct Permission For Docker Compose

After downloading the binary, set the correct permissions to make it executable:

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

Check Docker Compose Installation

Verify the Docker Compose installation by checking its version:

sudo docker compose version

This command should display the installed Docker Compose version, confirming that the installation was successful.

Step 2. How To Use Docker Compose on AlmaLinux 9?

To ensure Docker Compose is working correctly, let’s test it with a simple Docker container.

First, create a new directory for the docker-compose.yml file:

mkdir compose-test

Switch to the newly created directory:

cd compose-test

Now, create a docker-compose.yml file. This file defines the services, networks, and volumes for your application. Use your favorite text editor, such as vi, to create and edit the file:

sudo vi docker-compose.yml

Add the following basic hello-world container based on the latest hello-world image:

version: '2'
services:
   hello-world:
      image:
         hello-world:latest

Save and close the file.

Next, launch the container within the compose-test directory:

sudo docker compose up

The output should indicate that Docker Compose is working correctly on AlmaLinux 9, displaying the "Hello from Docker!" message.

Step 3. Uninstall Docker Compose (Optional)

If you need to uninstall Docker Compose from your system, follow these steps:

First, remove the docker-compose binary package:

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

Uninstall the Docker Compose software using the DNF package manager:

sudo dnf remove docker-compose

Finally, remove any unwanted software dependencies:

sudo dnf autoremove

Conclusion

You have successfully learned how to Install Docker Compose on AlmaLinux 9. You tested your installation with a simple hello-world example.

Hope you enjoyed it.

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Alternative Solutions for Installing Docker Compose on AlmaLinux 9

While the above method of downloading the binary directly is a common approach, there are alternative ways to install Docker Compose on AlmaLinux 9. Here are two such methods:

1. Using the dnf Package Manager (If Available)

Depending on the repositories configured on your AlmaLinux 9 system, Docker Compose might be available as a package through the dnf package manager. This is a simpler method as it handles dependencies automatically. However, the version available might not be the latest.

First, search for the docker-compose package:

sudo dnf search docker-compose

If the package is found, install it using:

sudo dnf install docker-compose

After installation, verify the installation by checking the version:

docker compose version

Explanation:

This method leverages the existing package management system, dnf, to install Docker Compose. It simplifies the installation process by handling dependencies automatically. However, the version available through the package manager might not always be the latest.

2. Installing Docker Compose as a Plugin

Newer versions of Docker have the capability to install Docker Compose as a plugin. This is the recommended way to install Docker Compose with recent Docker versions.

First, make sure the older version is uninstalled, if it exists, following the instructions in the Step 3 of the original article.

Then, run the following command:

docker compose version

If Docker Compose is not already installed as a plugin, Docker will prompt you to install it.

Alternatively, you can directly use:

docker plugin install docker/compose:latest

Explanation:

This approach integrates Docker Compose directly into the Docker CLI, making it a seamless part of the Docker ecosystem. The command docker compose version will transparently use the plugin once installed.
The plugin installation method is generally preferred, especially for recent versions of Docker, as it ensures compatibility and leverages the latest features.
These alternative methods provide flexibility in choosing the installation approach that best suits your needs and system configuration when you Set up Docker Compose on AlmaLinux 9.