instruction: Explain Install Docker Engine on CentOS
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  To get started with Docker Engine on CentOS, make sure you
  meet the prerequisites
  , and then follow the
  installation steps
  Prerequisites
  OS requirements
  To install Docker Engine, you need a maintained version of one of the following
  CentOS versions:
  CentOS 9 (stream)
  centos-extras
  repository must be enabled. This repository is enabled by
  default. If you have disabled it, you need to re-enable it.
  Uninstall old versions
  Before you can install Docker Engine, you need to uninstall any conflicting packages.
  Your Linux distribution may provide unofficial Docker packages, which may conflict
  with the official packages provided by Docker. You must uninstall these packages
  before you install the official version of Docker Engine.
  sudo dnf remove docker
  docker-client \
  docker-client-latest \
  docker-common \
  docker-latest \
  docker-latest-logrotate \
  docker-logrotate \
  docker-engine
  might report that you have none of these packages installed.
  Images, containers, volumes, and networks stored in
  /var/lib/docker/
  aren't
  automatically removed when you uninstall Docker.
  Installation methods
  You can install Docker Engine in different ways, depending on your needs:
  You can
  set up Docker's repositories
  and install
  from them, for ease of installation and upgrade tasks. This is the
  recommended approach.
  You can download the RPM package,
  install it manually
  , and manage
  upgrades completely manually. This is useful in situations such as installing
  Docker on air-gapped systems with no access to the internet.
  In testing and development environments, you can use automated
  convenience scripts
  to install Docker.
  Install using the rpm repository
  Before you install Docker Engine for the first time on a new host machine, you
  need to set up the Docker repository. Afterward, you can install and update
  Docker from the repository.
  Set up the repository
  Install the
  dnf-plugins-core
  package (which provides the commands to manage
  your DNF repositories) and set up the repository.
  sudo dnf -y install dnf-plugins-core
  sudo dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
  Install Docker Engine
  Install the Docker packages.
  Latest
  Specific version
  To install the latest version, run:
  sudo dnf install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
  If prompted to accept the GPG key, verify that the fingerprint matches
  060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35
  , and if so, accept it.
  This command installs Docker, but it doesn't start Docker. It also creates a
  docker
  group, however, it doesn't add any users to the group by default.
  To install a specific version, start by listing the available versions in
  the repository:
  dnf list docker-ce --showduplicates
  sort -r
  docker-ce.x86_64 3:28.3.3-1.el9 docker-ce-stable
  docker-ce.x86_64 3:28.3.2-1.el9 docker-ce-stable
  <...>
  The list returned depends on which repositories are enabled, and is specific
  to your version of CentOS (indicated by the
  .el9
  suffix in this example).
  Install a specific version by its fully qualified package name, which is
  the package name (
  docker-ce
  ) plus the version string (2nd column),
  separated by a hyphen (
  ). For example,
  docker-ce-3:28.3.3-1.el9
  Replace
  <VERSION_STRING>
  with the desired version and then run the following
  command to install:
  sudo dnf install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io docker-buildx-plugin docker-compose-plugin
  This command installs Docker, but it doesn't start Docker. It also creates a
  docker
  group, however, it doesn't add any users to the group by default.
  Start Docker Engine.
  sudo systemctl
  enable
  --now docker
  This configures the Docker systemd service to start automatically when you
  boot your system. If you don't want Docker to start automatically, use
  sudo systemctl start docker
  instead.
  Verify that the installation is successful by running the
  hello-world
  image:
  sudo docker run hello-world
  This command downloads a test image and runs it in a container. When the
  container runs, it prints a confirmation message and exits.
  You have now successfully installed and started Docker Engine.
  Receiving errors when trying to run without root?
  docker
  user group exists but contains no users, which is why youâre required
  to use
  sudo
  to run Docker commands. Continue to
  Linux postinstall
  to allow non-privileged users to run Docker commands and for other optional configuration steps.
  Upgrade Docker Engine
  To upgrade Docker Engine, follow the
  installation instructions
  choosing the new version you want to install.
  Install from a package
  If you can't use Docker's
  repository to install Docker Engine, you can
  download the
  .rpm
  file for your release and install it manually. You need to
  download a new file each time you want to upgrade Docker Engine.
  Go to
  https://download.docker.com/linux/centos/
  and choose your version of CentOS. Then browse to
  x86_64/stable/Packages/
  and download the
  .rpm
  file for the Docker version you want to install.
  Install Docker Engine, changing the following path to the path where you downloaded
  the Docker package.
  sudo dnf install /path/to/package.rpm
  Docker is installed but not started. The
  docker
  group is created, but no
  users are added to the group.
  Start Docker Engine.
  sudo systemctl
  enable
  --now docker
  This configures the Docker systemd service to start automatically when you
  boot your system. If you don't want Docker to start automatically, use
  sudo systemctl start docker
  instead.
  Verify that the installation is successful by running the
  hello-world
  image:
  sudo docker run hello-world
  This command downloads a test image and runs it in a container. When the
  container runs, it prints a confirmation message and exits.
  You have now successfully installed and started Docker Engine.
  Receiving errors when trying to run without root?
  docker
  user group exists but contains no users, which is why youâre required
  to use
  sudo
  to run Docker commands. Continue to
  Linux postinstall
  to allow non-privileged users to run Docker commands and for other optional configuration steps.
  Upgrade Docker Engine
  To upgrade Docker Engine, download the newer package files and repeat the
  installation procedure
  , using
  dnf upgrade
  instead of
  dnf install
  , and point to the new files.
  Install using the convenience script
  Docker provides a convenience script at
  https://get.docker.com/
  to install Docker into
  development environments non-interactively. The convenience script isn't
  recommended for production environments, but it's useful for creating a
  provisioning script tailored to your needs. Also refer to the
  install using the repository
  steps to learn
  about installation steps to install using the package repository. The source code
  for the script is open source, and you can find it in the
  docker-install
  repository on GitHub
  Always examine scripts downloaded from the internet before running them locally.
  Before installing, make yourself familiar with potential risks and limitations
  of the convenience script:
  The script requires
  root
  sudo
  privileges to run.
  The script attempts to detect your Linux distribution and version and
  configure your package management system for you.
  The script doesn't allow you to customize most installation parameters.
  The script installs dependencies and recommendations without asking for
  confirmation. This may install a large number of packages, depending on the
  current configuration of your host machine.
  By default, the script installs the latest stable release of Docker,
  containerd, and runc. When using this script to provision a machine, this may
  result in unexpected major version upgrades of Docker. Always test upgrades in
  a test environment before deploying to your production systems.
  The script isn't designed to upgrade an existing Docker installation. When
  using the script to update an existing installation, dependencies may not be
  updated to the expected version, resulting in outdated versions.
  Preview script steps before running. You can run the script with the
  --dry-run
  option to learn what steps the
  script will run when invoked:
  curl -fsSL https://get.docker.com -o get-docker.sh
  sudo sh ./get-docker.sh --dry-run
  This example downloads the script from
  https://get.docker.com/
  and runs it to install the
  latest stable release of Docker on Linux:
  curl -fsSL https://get.docker.com -o get-docker.sh
  sudo sh get-docker.sh
  Executing docker install script, commit: 7cae5f8b0decc17d6571f9f52eb840fbc13b2737
  <...>
  You have now successfully installed and started Docker Engine. The
  docker
  service starts automatically on Debian based distributions. On
  based
  distributions, such as CentOS, Fedora, RHEL or SLES, you need to start it
  manually using the appropriate
  systemctl
  service
  command. As the message
  indicates, non-root users can't run Docker commands by default.
  Use Docker as a non-privileged user, or install in rootless mode?
  The installation script requires
  root
  sudo
  privileges to install and
  use Docker. If you want to grant non-root users access to Docker, refer to the
  post-installation steps for Linux
  You can also install Docker without
  root
  privileges, or configured to run in
  rootless mode. For instructions on running Docker in rootless mode, refer to
  run the Docker daemon as a non-root user (rootless mode)
  Install pre-releases
  Docker also provides a convenience script at
  https://test.docker.com/
  to install pre-releases of
  Docker on Linux. This script is equal to the script at
  get.docker.com
  , but
  configures your package manager to use the test channel of the Docker package
  repository. The test channel includes both stable and pre-releases (beta
  versions, release-candidates) of Docker. Use this script to get early access to
  new releases, and to evaluate them in a testing environment before they're
  released as stable.
  To install the latest version of Docker on Linux from the test channel, run:
  curl -fsSL https://test.docker.com -o test-docker.sh
  sudo sh test-docker.sh
  Upgrade Docker after using the convenience script
  If you installed Docker using the convenience script, you should upgrade Docker
  using your package manager directly. There's no advantage to re-running the
  convenience script. Re-running it can cause issues if it attempts to re-install
  repositories which already exist on the host machine.
  Uninstall Docker Engine
  Uninstall the Docker Engine, CLI, containerd, and Docker Compose packages:
  sudo dnf remove docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin docker-ce-rootless-extras
  Images, containers, volumes, or custom configuration files on your host
  aren't automatically removed. To delete all images, containers, and volumes:
  sudo rm -rf /var/lib/docker
  sudo rm -rf /var/lib/containerd
  You have to delete any edited configuration files manually.
  Next steps
  Continue to
  Post-installation steps for Linux