Installing and Uninstalling Docker Engine from a Package

`docker` group, however, it doesn't add any users to the group by default. {{< /tab >}} {{< /tabs >}} 2. Start Docker Engine. ```console $ 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. 3. Verify that the installation is successful by running the `hello-world` image: ```console $ 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. {{% include "root-errors.md" %}} #### Upgrade Docker Engine To upgrade Docker Engine, follow the [installation instructions](#install-using-the-repository), choosing the new version you want to install. ### Install from a package 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.  1. Go to [{{% param "download-url-base" %}}/]({{% param "download-url-base" %}}/). 2. Select your RHEL version in the list. 3. Select the applicable architecture (`x86_64`, `aarch64`, or `s390x`), and then go to `stable/Packages/`. 4. Download the following `rpm` files for the Docker Engine, CLI, containerd, and Docker Compose packages: - `containerd.io-<version>.<arch>.rpm` - `docker-ce-<version>.<arch>.rpm` - `docker-ce-cli-<version>.<arch>.rpm` - `docker-buildx-plugin-<version>.<arch>.rpm` - `docker-compose-plugin-<version>.<arch>.rpm` 5. Install Docker Engine, changing the following path to the path where you downloaded the packages. ```console $ sudo dnf install ./containerd.io-<version>.<arch>.rpm \ ./docker-ce-<version>.<arch>.rpm \ ./docker-ce-cli-<version>.<arch>.rpm \ ./docker-buildx-plugin-<version>.<arch>.rpm \ ./docker-compose-plugin-<version>.<arch>.rpm ``` Docker is installed but not started. The `docker` group is created, but no users are added to the group. 6. Start Docker Engine. ```console $ 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. 7. Verify that the installation is successful by running the `hello-world` image: ```console $ 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. {{% include "root-errors.md" %}} #### Upgrade Docker Engine To upgrade Docker Engine, download the newer package files and repeat the [installation procedure](#install-from-a-package), using `dnf upgrade` instead of `dnf install`, and point to the new files. {{% include "install-script.md" %}} ## Uninstall Docker Engine 1. Uninstall the Docker Engine, CLI, containerd, and Docker Compose packages: ```console $ sudo dnf remove docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin docker-ce-rootless-extras ``` 2. Images, containers, volumes, or custom configuration files on your host aren't automatically removed. To delete all images, containers, and volumes: ```console $ 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](linux-postinstall.md).

This section covers installing Docker Engine by downloading RPM packages manually, which is useful if the RPM repository method is not feasible. It details the steps for downloading the necessary packages (Docker Engine, CLI, containerd, and Docker Compose) for the user's specific architecture and RHEL version. After downloading, the instructions guide the user through installing the packages using `dnf`, starting the Docker service, and verifying the installation. It also provides instructions on how to upgrade Docker Engine by downloading newer package files and using `dnf upgrade`. Finally, it covers the process of uninstalling Docker Engine and related components, as well as removing images, containers, and volumes. The section concludes with a pointer to post-installation steps.