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Docker Installation Guide

This guide covers the installation of Docker and Docker Compose on CentOS and Amazon Linux. Follow the respective instructions based on your environment.

Docker Installation for CentOS​

Prerequisites​

  • CentOS 8 or higher
  • Root or sudo access
  • Minimum 2GB of RAM recommended, 8GB of RAM recommended for all Liberty Framework Services.

Step 1: Update System Packages​

Before starting the installation, update your system to ensure all packages are up-to-date.

sudo yum update -y

if Podman is installed, remove all packages, artifacts and containers storage

yum remove buildah skopeo podman containers-common atomic-registries docker container-tools
rm -rf /etc/containers/* /var/lib/containers/* /etc/docker /etc/subuid* /etc/subgid*
cd ~ && rm -rf /.local/share/containers/

Step 2: Install Required Dependencies​

Install the necessary packages required to set up the Docker repository.

sudo yum install -y yum-utils

Step 3: Set Up the Docker Repository​

Add the Docker repository to your CentOS system.

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

Step 4: Install Docker​

Install Docker Engine, CLI, and Containerd.

sudo yum install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Step 5: Start and Enable Docker​

Start the Docker service and enable it to start on boot.

sudo systemctl start docker
sudo systemctl enable docker

Step 6: Verify Docker Installation​

Verify the installation by running a test Docker container.

sudo docker run hello-world

If the container runs and displays a welcome message, Docker is installed correctly.

Step 7: Adding Your User to the Docker Group (Optional)​

To run Docker commands without sudo, add your user to the Docker group.

sudo usermod -aG docker $(whoami)

Log out and log back in to apply the group changes.

Uninstall Docker​

To remove Docker, the CLI, Containerd, and Docker Compose, use the following commands:

sudo yum remove docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin docker-ce-rootless-extras
sudo rm -rf /var/lib/docker
sudo rm -rf /var/lib/containerd

Docker Installation for Amazon Linux OS​

Prerequisites​

  • Amazon Linux or Amazon Linux 2
  • Root or sudo access
  • Minimum 2GB of RAM recommended, 8GB of RAM recommended for all Liberty Framework Services.

Step 1: Update System Packages​

Before starting the installation, update your system to ensure all packages are up-to-date.

sudo yum update -y

Step 2: Install Docker​

Install Docker using the Amazon Linux Extras & yum package manager.

sudo amazon-linux-extras install docker -y

Step 3: Start and Enable Docker​

Start the Docker service and enable it to start on boot.

sudo systemctl start docker
sudo systemctl enable docker

Step 4: Verify Docker Installation​

Verify the installation by running a test Docker container.

sudo docker run hello-world

If the container runs and displays a welcome message, Docker is installed correctly.

Step 5: Install Docker Compose​

Download the current stable release of Docker Compose:

sudo curl -L "https://github.com/docker/compose/releases/download/$(curl -s https://api.github.com/repos/docker/compose/releases/latest | grep -Po '"tag_name": "\K.*?(?=")')/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

Apply executable permissions to the binary:

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

Verify that the installation was successful:

docker-compose --version

Step 6: Adding Your User to the Docker Group (Optional)​

To run Docker commands without sudo, add your user to the Docker group.

sudo usermod -aG docker $(whoami)

Log out and log back in to apply the group changes.

Uninstall Docker​

To remove Docker, the CLI, Containerd, and Docker Compose, use the following commands:

sudo yum remove docker
sudo rm -rf /var/lib/docker
sudo rm /usr/local/bin/docker-compose

Post installation Tasks​

If you want to set a custom directory for docker and if you are running behind a proxy, the docker service must be modified

Edit the service: /lib/systemd/system/docker.service

[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd --data-root <CUSTOM_DIRECTORY> -H fd:// --containerd=/run/containerd/containerd.sock
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutStartSec=0
RestartSec=2
Restart=always
Environment="HTTP_PROXY=<PROXY_URL>"
Environment="HTTPS_PROXY=<PROXY_URL>"

If you want to change the default IP range (172.17.x.x) for docker Edit the file: /etc/docker/daemon.json

# Set the ip range according to your requirements
# bip is for the internal interface
# default-address-pools is for all new networks
{
  "bip": "172.26.0.1/16",
  "default-address-pools": [
    { "base": "172.27.0.0/16", "size": 24 }
  ]
}

Conclusion​

You have successfully installed Docker and Docker Compose on your CentOS or Amazon Linux OS system. You can now begin deploying and managing your Docker containers for Liberty Framework.

References​