--- description: Instructions for installing Docker CE on CentOS keywords: requirements, apt, installation, centos, rpm, install, uninstall, upgrade, update redirect_from: - /engine/installation/centos/ - /engine/installation/linux/docker-ce/centos/ - /install/linux/centos/ - /engine/installation/linux/centos/ title: Get Docker CE for CentOS toc_max: 4 --- To get started with Docker CE on CentOS, make sure you [meet the prerequisites](#prerequisites), then [install Docker](#install-docker-ce). ## Prerequisites ### Docker EE customers To install Docker Enterprise Edition (Docker EE), go to [Get Docker EE for CentOS](/install/linux/docker-ee/centos/) **instead of this topic**. To learn more about Docker EE, see [Docker Enterprise Edition](https://www.docker.com/enterprise-edition/){: target="_blank" class="_" }. ### OS requirements To install Docker CE, you need a maintained version of CentOS 7. 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" 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. ```bash $ sudo yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-selinux \ docker-engine-selinux \ 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 CE package is now called `docker-ce`. ## Install Docker CE You can install Docker CE 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 CE 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" %} 1. Install required packages. `yum-utils` provides the `yum-config-manager` utility, and `device-mapper-persistent-data` and `lvm2` are required by the `devicemapper` storage driver. ```bash $ sudo yum install -y yum-utils \ device-mapper-persistent-data \ lvm2 ``` 2. Use the following command to set up the **stable** repository. You always need the **stable** repository, even if you want to install builds from the **edge** or **test** repositories as well. ```bash $ sudo yum-config-manager \ --add-repo \ {{ download-url-base }}/docker-ce.repo ``` 3. **Optional**: Enable the **edge** and **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. ```bash $ sudo yum-config-manager --enable docker-ce-edge ``` ```bash $ sudo yum-config-manager --enable docker-ce-test ``` You can disable the **edge** 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 **edge** repository. ```bash $ sudo yum-config-manager --disable docker-ce-edge ``` > **Note**: Starting with Docker 17.06, stable releases are also pushed to > the **edge** and **test** repositories. [Learn about **stable** and **edge** builds](/install/index.md). #### Install Docker CE 1. Install the _latest version_ of Docker CE, or go to the next step to install a specific version: ```bash $ sudo yum install docker-ce ``` 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 CE, 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: ```bash $ yum list docker-ce --showduplicates | sort -r docker-ce.x86_64 {{ site.docker_ce_stable_version }}.0.ce-1.el7.centos 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) up to the first hyphen, separated by a hyphen (`-`), for example, `docker-ce-18.03.0.ce`. ```bash $ sudo yum install docker-ce- ``` Docker is installed but not started. The `docker` group is created, but no users are added to the group. 3. Start Docker. ```bash $ sudo systemctl start docker ``` 4. Verify that `docker` is installed correctly by running the `hello-world` image. ```bash $ 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 CE is installed and running. You need to use `sudo` to run Docker commands. Continue to [Linux postinstall](/install/linux/linux-postinstall.md) to allow non-privileged users to run Docker commands and for other optional configuration steps. #### Upgrade Docker CE To upgrade Docker CE, follow the [installation instructions](#install-docker-ce), 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. 1. Go to [{{ download-url-base }}/7/x86_64/stable/Packages/]({{ download-url-base }}/7/x86_64/stable/Packages/) and download the `.rpm` file for the Docker version you want to install. > **Note**: To install an **edge** package, change the word > `stable` in the above URL to `edge`. > [Learn about **stable** and **edge** channels](/install/index.md). 2. Install Docker CE, changing the path below to the path where you downloaded the Docker package. ```bash $ 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. ```bash $ sudo systemctl start docker ``` 4. Verify that `docker` is installed correctly by running the `hello-world` image. ```bash $ 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 CE is installed and running. You need to use `sudo` to run Docker commands. Continue to [Post-installation steps for Linux](/install/linux/linux-postinstall.md) to allow non-privileged users to run Docker commands and for other optional configuration steps. #### Upgrade Docker CE To upgrade Docker CE, 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 CE 1. Uninstall the Docker package: ```bash $ sudo yum remove docker-ce ``` 2. Images, containers, volumes, or customized configuration files on your host are not automatically removed. To delete all images, containers, and volumes: ```bash $ sudo rm -rf /var/lib/docker ``` You must delete any edited configuration files manually. ## Next steps - Continue to [Post-installation steps for Linux](/install/linux/linux-postinstall.md) - Continue with the [User Guide](/engine/userguide/index.md).