Debian 11

To install Docker on Debian 11, follow these steps:

Step 1: Update the System

First, update your existing list of packages:

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sudo apt update

Next, upgrade the packages:

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sudo apt upgrade -y

Step 2: Install the Necessary Software

Docker requires some packages that are not installed by default, including packages to allow apt to use a repository over HTTPS:

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sudo apt install apt-transport-https ca-certificates curl gnupg lsb-release -y

Step 3: Add Docker’s GPG Key

Next, add Docker’s official GPG key:

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sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg

Step 4: Set up the Docker Stable Repository

Then, use the following command to set up the stable Docker repository:

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echo \
  "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian \
  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Step 5: Install Docker CE (Community Edition)

Update the apt package list and install the latest version of Docker CE:

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sudo apt update
sudo apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin -y

Step 6: Verify the Docker Installation

Finally, verify that Docker CE is installed correctly by running the hello-world Docker image:

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sudo docker run hello-world

This command downloads a test image and runs it in a container. If it runs successfully, it prints an informational message and exits.

You should now have Docker installed on your Debian 11 system. If you want to run Docker commands as a non-root user without prepending sudo, you’ll need to add your user to the docker group:

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sudo usermod -aG docker ${USER}

You may need to log out and back in for these changes to take effect.

Red Hat 9

Red Hat Enterprise Linux 9 has removed Docker from its official repositories. However, you can still install Docker using other methods.

One such alternative is using Podman, which is a daemonless container engine for developing, managing, and running OCI Containers on your Linux System. Containers can either be run as root or in rootless mode.

If you want to install Docker, here is a way to do it:

1. Setup the repository:

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

2. Install Docker Engine:

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sudo dnf install docker-ce docker-ce-cli containerd.io

3. Start Docker:

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sudo systemctl start docker

4. Verify that Docker Engine is installed correctly by running the hello-world image:

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sudo docker run hello-world

5. Enable Docker to start on boot:

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sudo systemctl enable docker

Please note that the installation process might slightly differ based on the exact version of your RHEL system and the system setup. If any of the steps does not work as expected, refer to the Docker official documentation.

Remember that using Docker requires root privileges so make sure to use sudo with Docker commands, or give Docker these privileges correctly.

If you want to use a more RHEL native solution, consider using Podman and Buildah. These tools provide similar functionalities to Docker but are designed with a different architecture that doesn’t require a daemon and run as a normal user.

Also, be aware that running the Docker daemon on your system can have security implications; you should understand these before deciding to use Docker.