Welcome to our comprehensive AlmaLinux 9 Docker installation guide. In this step-by-step tutorial, we will walk you through the process of installing Docker on your AlmaLinux 9 system. Docker is a powerful containerization tool that allows developers to package and deploy applications effortlessly.
If you are new to Docker or simply looking for a straightforward guide on how to install Docker on AlmaLinux 9, you've come to the right place. We will cover all the necessary prerequisites, enabling the Docker repository, installation steps, and verifying the installation with ease.
Whether you are a beginner or an experienced developer, this guide will provide you with the knowledge and confidence to successfully set up Docker on your AlmaLinux 9 system.
Prerequisites for Installing Docker on AlmaLinux 9
Before you begin installing Docker on your AlmaLinux 9 system, there are a few prerequisites that you need to have in place:
- Minimal Installed AlmaLinux 9: Make sure you have AlmaLinux 9 already installed on your system.
- 2 CPU/vCPU & 2GB RAM: Ensure that your system has at least 2 CPU/vCPU cores and 2GB of RAM to meet Docker's minimum requirements.
- 10 GB Free Disk Space: Allocate at least 10 GB of free disk space to accommodate Docker and its containers.
- Sudo User with Admin Rights: You will need administrative privileges to install Docker, so make sure you have a sudo user with administrative rights.
- Internet Connectivity: You need an active internet connection to download the necessary Docker packages and dependencies.
Having these prerequisites in place will ensure a smooth installation process and allow you to fully leverage the power of Docker on your AlmaLinux 9 system. Once you have confirmed that you meet these requirements, you can proceed with the installation process outlined in the following sections.
Notable Quote:
"To harness the benefits of Docker on AlmaLinux 9, it's crucial to have the right setup. By ensuring you have the minimal AlmaLinux 9 installation, sufficient system resources, disk space, administrative privileges, and a stable internet connection, you'll be ready to embark on your Docker journey."
Uninstalling Podman and Buildah (if necessary)
If you already have Podman and Buildah installed on your AlmaLinux 9 system, you will need to uninstall them before proceeding with the Docker installation. This ensures a clean installation and prevents any conflicts between the containerization tools.
To uninstall Podman and Buildah, you can use the following command in your terminal:
$ sudo dnf remove -y podman buildah
Executing this command will remove both Podman and Buildah from your system. You might be prompted to confirm the uninstallation process, so make sure to review the list of packages before proceeding.
Once the uninstallation is complete, you can proceed with the next steps to enable and install Docker on AlmaLinux 9.
Enabling the Docker Repository
If you are looking to install Docker on AlmaLinux 9, you'll need to enable the Docker repository first. By default, the Docker package is not available in the AlmaLinux 9 package repositories. Enabling the official Docker repository will provide you with access to the latest Docker packages.
To enable the Docker repository, open your terminal and run the following command:
$ sudo dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
This command will add the Docker repository to your system's configuration. Once the repository is added, you'll be able to install and update Docker packages using the package manager.
Enabling the Docker repository is a crucial step in the process of installing Docker on AlmaLinux 9. It ensures that you have access to the most up-to-date Docker packages, allowing you to take advantage of the latest features and bug fixes.
Installing Docker with DNF Command
Once you have enabled the Docker repository on your AlmaLinux 9 system, you can proceed with the installation process. The DNF command makes it easy to install Docker and its dependencies. Simply open your terminal and enter the following command:
sudo dnf install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin
This command will install the latest version of Docker as well as the necessary components for running Docker containers. The "-y" flag ensures that you won't be prompted for confirmation during the installation process, making it more convenient and time-saving.
Once the installation is complete, you're ready to start using Docker on your AlmaLinux 9 system. With Docker, you can easily package and deploy your applications in containers, making them more portable and efficient.
Why use DNF for Docker installation?
- DNF is the default package manager in AlmaLinux 9, making it the easiest and most recommended method for installing Docker.
- DNF handles dependencies automatically, ensuring that all required packages are installed correctly.
- Using DNF allows for seamless updates and upgrades of Docker. You can easily keep your Docker installation up to date with new features and security patches.
By following the steps outlined in this guide, you will have Docker installed on your AlmaLinux 9 system in no time. The DNF command simplifies the installation process and ensures that you have all the necessary components to start using Docker effectively.
Starting and Enabling Docker Service
Now that you have successfully installed Docker on your AlmaLinux 9 system, it's time to start and enable the Docker service. This will ensure that Docker is up and running and will start automatically whenever your system boots up.
To start the Docker service, open a terminal and run the following command:
$ sudo systemctl start docker
This command will start the Docker service and you should see a success message indicating that the service has started. You can also check the status of the Docker service by running the following command:
$ sudo systemctl status docker
Additionally, if you want Docker to start automatically whenever your system boots up, you can enable the Docker service using the following command:
$ sudo systemctl enable docker
With the Docker service started and enabled, you are now ready to use Docker to deploy and manage your containers on AlmaLinux 9.
Verifying Docker Installation
To ensure that Docker is successfully installed on your AlmaLinux 9 system, you need to verify its status. Open a terminal and run the following command as a sudo user:
$ sudo systemctl status docker
This command will display the current status of the Docker service. If Docker is active and running, you will see a message indicating that the service is active and enabled. This confirms that Docker has been installed successfully on your AlmaLinux 9 system.
In addition to checking the service status, you may also want to check the version of Docker installed on your system. You can do this by running the following command:
$ docker --version
This command will display the version of Docker installed on your system, allowing you to confirm that you have the latest version installed.
Summary:
In this section, you learned how to verify the installation of Docker on AlmaLinux 9. By running the appropriate commands, you can check the service status and confirm the version of Docker installed on your system. This step is crucial to ensure that Docker is properly functioning and ready to use for container deployment and management.
Testing Docker Installation
Now that you have successfully installed Docker on your AlmaLinux 9 system, it's time to test it out and ensure everything is working as expected. Follow the steps below to verify your Docker installation:
- Open a terminal or command prompt on your AlmaLinux 9 system.
- Type the following command and press Enter:
docker run hello-world - Wait for Docker to download the "hello-world" image and launch a container based on it.
- If everything went well, you should see a message indicating that Docker is running correctly and a "Hello from Docker!" test message.
This test confirms that Docker is installed and functioning properly on your system. You can now proceed to deploy and manage containers for your applications.
If you encounter any issues during the testing process or have any questions, feel free to refer to the Docker documentation or seek assistance from the Docker community. They are always ready to help you on your Docker journey.
Conclusion
Congratulations! You have successfully installed Docker on your AlmaLinux 9 system. With Docker, you now have a powerful tool for containerizing your applications, making deployment and management a breeze.
Now that you have Docker up and running, you can start exploring its various features and benefits. Docker allows you to easily package your applications and dependencies into lightweight containers, making them portable and scalable across different environments.
Whether you're a developer, system administrator, or DevOps engineer, Docker can greatly simplify your workflow and accelerate your application development process. You can now deploy multiple containers on a single host, isolate your applications, and manage resources efficiently.
If you encounter any issues or have any questions while using Docker on AlmaLinux 9, feel free to reach out. We are here to help you make the most out of Docker and ensure a smooth and successful containerization journey.
