--- description: Instructions for installing Docker Engine on CentOS keywords: requirements, apt, installation, centos, rpm, install, uninstall, upgrade, update redirect_from: - /ee/docker-ee/centos/ - /ee/docker-ee/rhel/ - /engine/installation/centos/ - /engine/installation/centos/ - /engine/installation/linux/centos/ - /engine/installation/linux/docker-ce/centos/ - /engine/installation/linux/docker-ee/centos/ - /engine/installation/linux/docker-ee/rhel/ - /engine/installation/linux/rhel/ - /engine/installation/rhel/ - /install/linux/centos/ - /install/linux/docker-ce/centos/ - /install/linux/docker-ee/centos/ - /install/linux/docker-ee/rhel/ - /installation/rhel/ title: Install Docker Engine on CentOS toc_max: 4 --- To get started with Docker Engine on CentOS, make sure you [meet the prerequisites](#prerequisites), then [install Docker](#installation-methods). ## Prerequisites ### OS requirements To install Docker Engine, you need a maintained version of CentOS 7 or 8. Archived versions aren't supported or tested. The `centos-extras` repository must be enabled. This repository is enabled by default, but if you have disabled it, you need to [re-enable it](https://wiki.centos.org/AdditionalResources/Repositories){: target="_blank" rel="noopener" class="_" }. The `overlay2` storage driver is recommended. ### Uninstall old versions Older versions of Docker were called `docker` or `docker-engine`. If these are installed, uninstall them, along with associated dependencies. ```console $ sudo yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine ``` It's OK if `yum` reports that none of these packages are installed. The contents of `/var/lib/docker/`, including images, containers, volumes, and networks, are preserved. The Docker Engine package is now called `docker-ce`. ## Installation methods You can install Docker Engine in different ways, depending on your needs: - Most users [set up Docker's repositories](#install-using-the-repository) and install from them, for ease of installation and upgrade tasks. This is the recommended approach. - Some users download the RPM package and [install it manually](#install-from-a-package) 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, some users choose to use automated [convenience scripts](#install-using-the-convenience-script) to install Docker. ### Install using the 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 {% assign download-url-base = "https://download.docker.com/linux/centos" %} Install the `yum-utils` package (which provides the `yum-config-manager` utility) and set up the **stable** repository. ```console $ sudo yum install -y yum-utils $ sudo yum-config-manager \ --add-repo \ {{ download-url-base }}/docker-ce.repo ``` > **Optional**: Enable the **nightly** or **test** repositories. > > These repositories are included in the `docker.repo` file above but are disabled > by default. You can enable them alongside the stable repository. The following > command enables the **nightly** repository. > > ```console > $ sudo yum-config-manager --enable docker-ce-nightly > ``` > > To enable the **test** channel, run the following command: > > ```console > $ sudo yum-config-manager --enable docker-ce-test > ``` > > You can disable the **nightly** or **test** repository by running the > `yum-config-manager` command with the `--disable` flag. To re-enable it, use > the `--enable` flag. The following command disables the **nightly** repository. > > ```console > $ sudo yum-config-manager --disable docker-ce-nightly > ``` > > [Learn about **nightly** and **test** channels](index.md). #### Install Docker Engine 1. Install the _latest version_ of Docker Engine and containerd, or go to the next step to install a specific version: ```console $ sudo yum install docker-ce docker-ce-cli containerd.io ``` 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. > Got multiple Docker repositories? > > If you have multiple Docker repositories enabled, installing > or updating without specifying a version in the `yum install` or > `yum update` command always installs the highest possible version, > which may not be appropriate for your stability needs. Docker is installed but not started. The `docker` group is created, but no users are added to the group. 2. To install a _specific version_ of Docker Engine, list the available versions in the repo, then select and install: a. List and sort the versions available in your repo. This example sorts results by version number, highest to lowest, and is truncated: ```console $ yum list docker-ce --showduplicates | sort -r docker-ce.x86_64 3:18.09.1-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.0-3.el7 docker-ce-stable docker-ce.x86_64 18.06.1.ce-3.el7 docker-ce-stable docker-ce.x86_64 18.06.0.ce-3.el7 docker-ce-stable ``` The list returned depends on which repositories are enabled, and is specific to your version of CentOS (indicated by the `.el7` suffix in this example). b. Install a specific version by its fully qualified package name, which is the package name (`docker-ce`) plus the version string (2nd column) starting at the first colon (`:`), up to the first hyphen, separated by a hyphen (`-`). For example, `docker-ce-18.09.1`. ```console $ sudo yum install docker-ce- docker-ce-cli- containerd.io ``` Docker is installed but not started. The `docker` group is created, but no users are added to the group. 3. Start Docker. ```console $ sudo systemctl start docker ``` 4. Verify that Docker Engine is installed correctly 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 an informational message and exits. Docker Engine is installed and running. You need to use `sudo` to run Docker commands. Continue to [Linux postinstall](linux-postinstall.md) 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](#install-using-the-repository), choosing the new version you want to install. ### Install from a package If you cannot use Docker's repository to install Docker, 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 [{{ download-url-base }}/]({{ download-url-base }}/){: target="_blank" rel="noopener" class="_" } 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. > **Note**: To install a **nightly** or **test** (pre-release) package, > change the word `stable` in the above URL to `nightly` or `test`. > [Learn about **nightly** and **test** channels](index.md). 2. Install Docker Engine, changing the path below to the path where you downloaded the Docker package. ```console $ sudo yum install /path/to/package.rpm ``` Docker is installed but not started. The `docker` group is created, but no users are added to the group. 3. Start Docker. ```console $ sudo systemctl start docker ``` 4. Verify that Docker Engine is installed correctly 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 an informational message and exits. Docker Engine is installed and running. You need to use `sudo` to run Docker commands. Continue to [Post-installation steps for Linux](linux-postinstall.md) 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 file and repeat the [installation procedure](#install-from-a-package), using `yum -y upgrade` instead of `yum -y install`, and pointing to the new file. {% include install-script.md %} ## Uninstall Docker Engine 1. Uninstall the Docker Engine, CLI, and Containerd packages: ```console $ sudo yum remove docker-ce docker-ce-cli containerd.io ``` 2. Images, containers, volumes, or customized configuration files on your host are not automatically removed. To delete all images, containers, and volumes: ```console $ sudo rm -rf /var/lib/docker $ sudo rm -rf /var/lib/containerd ``` You must delete any edited configuration files manually. ## Next steps - Continue to [Post-installation steps for Linux](linux-postinstall.md). - Review the topics in [Develop with Docker](../../develop/index.md) to learn how to build new applications using Docker.