content/manuals/engine/install/centos.md
To get started with Docker Engine on CentOS, make sure you meet the prerequisites, and then follow the installation steps.
To install Docker Engine, you need a maintained version of one of the following CentOS versions:
The centos-extras repository must be enabled. This repository is enabled by
default. If you have disabled it, you need to re-enable it.
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
dnf 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.
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.
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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.
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 {{% param "download-url-base" %}}/docker-ce.repo
Install the Docker packages.
{{< tabs >}} {{< tab name="Latest" >}}
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.
{{< /tab >}} {{< tab name="Specific version" >}}
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:{{% param "docker_ce_version" %}}-1.el9 docker-ce-stable
docker-ce.x86_64 3:{{% param "docker_ce_version_prev" %}}-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:{{% param "docker_ce_version" %}}-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.
{{< /tab >}} {{< /tabs >}}
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.
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To upgrade Docker Engine, follow the installation instructions, choosing the new version you want to install.
If you can't use Docker's rpm 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 [{{% param "download-url-base" %}}/]({{% param "download-url-base" %}}/)
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.
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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.
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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.