添加 Centos 安装文件
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YuCheng Hu
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engine/install/centos.md
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engine/install/centos.md
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---
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description: Instructions for installing Docker Engine on CentOS
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keywords: requirements, apt, installation, centos, rpm, install, uninstall, upgrade, update
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redirect_from:
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- /engine/installation/centos/
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- /engine/installation/linux/docker-ce/centos/
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- /install/linux/centos/
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- /install/linux/docker-ce/centos/
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- /engine/installation/linux/centos/
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title: Install Docker Engine on CentOS
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toc_max: 4
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---
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如果希望在 CentOS 操作系统上安装 Docker ，请确定你需要安装的操作系统
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[满足安装需求](#prerequisites)，
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[安装 Docker](#installation-methods)
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页面中的内容。
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## Prerequisites
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### OS requirements
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To install Docker Engine, you need a maintained version of CentOS 7. Archived
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versions aren't supported or tested.
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The `centos-extras` repository must be enabled. This repository is enabled by
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default, but if you have disabled it, you need to
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[re-enable it](https://wiki.centos.org/AdditionalResources/Repositories){: target="_blank" rel="noopener" class="_" }.
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The `overlay2` storage driver is recommended.
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### Uninstall old versions
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Older versions of Docker were called `docker` or `docker-engine`. If these are
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installed, uninstall them, along with associated dependencies.
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```bash
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$ sudo yum remove docker \
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docker-client \
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docker-client-latest \
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docker-common \
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docker-latest \
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docker-latest-logrotate \
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docker-logrotate \
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docker-engine
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```
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It's OK if `yum` reports that none of these packages are installed.
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The contents of `/var/lib/docker/`, including images, containers, volumes, and
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networks, are preserved. The Docker Engine package is now called `docker-ce`.
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## Installation methods
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You can install Docker Engine in different ways, depending on your needs:
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- Most users
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[set up Docker's repositories](#install-using-the-repository) and install
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from them, for ease of installation and upgrade tasks. This is the
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recommended approach.
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- Some users download the RPM package and
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[install it manually](#install-from-a-package) and manage
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upgrades completely manually. This is useful in situations such as installing
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Docker on air-gapped systems with no access to the internet.
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- In testing and development environments, some users choose to use automated
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[convenience scripts](#install-using-the-convenience-script) to install Docker.
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### Install using the repository
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Before you install Docker Engine for the first time on a new host machine, you need
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to set up the Docker repository. Afterward, you can install and update Docker
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from the repository.
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#### Set up the repository
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{% assign download-url-base = "https://download.docker.com/linux/centos" %}
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Install the `yum-utils` package (which provides the `yum-config-manager`
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utility) and set up the **stable** repository.
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```bash
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$ sudo yum install -y yum-utils
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$ sudo yum-config-manager \
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--add-repo \
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{{ download-url-base }}/docker-ce.repo
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```
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> **Optional**: Enable the **nightly** or **test** repositories.
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>
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> These repositories are included in the `docker.repo` file above but are disabled
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> by default. You can enable them alongside the stable repository. The following
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> command enables the **nightly** repository.
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>
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> ```bash
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> $ sudo yum-config-manager --enable docker-ce-nightly
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> ```
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>
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> To enable the **test** channel, run the following command:
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>
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> ```bash
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> $ sudo yum-config-manager --enable docker-ce-test
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> ```
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>
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> You can disable the **nightly** or **test** repository by running the
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> `yum-config-manager` command with the `--disable` flag. To re-enable it, use
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> the `--enable` flag. The following command disables the **nightly** repository.
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>
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> ```bash
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> $ sudo yum-config-manager --disable docker-ce-nightly
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> ```
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>
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> [Learn about **nightly** and **test** channels](index.md).
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#### Install Docker Engine
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1. Install the _latest version_ of Docker Engine and containerd, or go to the next step to install a specific version:
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```bash
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$ sudo yum install docker-ce docker-ce-cli containerd.io
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```
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If prompted to accept the GPG key, verify that the fingerprint matches
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`060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35`, and if so, accept it.
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> Got multiple Docker repositories?
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>
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> If you have multiple Docker repositories enabled, installing
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> or updating without specifying a version in the `yum install` or
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> `yum update` command always installs the highest possible version,
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> which may not be appropriate for your stability needs.
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Docker is installed but not started. The `docker` group is created, but no users are added to the group.
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2. To install a _specific version_ of Docker Engine, list the available versions
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in the repo, then select and install:
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a. List and sort the versions available in your repo. This example sorts
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results by version number, highest to lowest, and is truncated:
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```bash
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$ yum list docker-ce --showduplicates | sort -r
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docker-ce.x86_64 3:18.09.1-3.el7 docker-ce-stable
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docker-ce.x86_64 3:18.09.0-3.el7 docker-ce-stable
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docker-ce.x86_64 18.06.1.ce-3.el7 docker-ce-stable
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docker-ce.x86_64 18.06.0.ce-3.el7 docker-ce-stable
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```
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The list returned depends on which repositories are enabled, and is specific
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to your version of CentOS (indicated by the `.el7` suffix in this example).
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b. Install a specific version by its fully qualified package name, which is
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the package name (`docker-ce`) plus the version string (2nd column)
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starting at the first colon (`:`), up to the first hyphen, separated by
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a hyphen (`-`). For example, `docker-ce-18.09.1`.
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```bash
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$ sudo yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io
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```
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Docker is installed but not started. The `docker` group is created, but no users are added to the group.
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3. Start Docker.
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```bash
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$ sudo systemctl start docker
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```
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4. Verify that Docker Engine is installed correctly by running the `hello-world`
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image.
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```bash
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$ sudo docker run hello-world
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```
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This command downloads a test image and runs it in a container. When the
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container runs, it prints an informational message and exits.
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Docker Engine is installed and running. You need to use `sudo` to run Docker
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commands. Continue to [Linux postinstall](linux-postinstall.md) to allow
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non-privileged users to run Docker commands and for other optional configuration
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steps.
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#### Upgrade Docker Engine
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To upgrade Docker Engine, follow the [installation instructions](#install-using-the-repository),
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choosing the new version you want to install.
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### Install from a package
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If you cannot use Docker's repository to install Docker, you can download the
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`.rpm` file for your release and install it manually. You need to download
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a new file each time you want to upgrade Docker Engine.
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1. Go to [{{ download-url-base }}/]({{ download-url-base }}/){: target="_blank" rel="noopener" class="_" }
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and choose your version of CentOS. Then browse to `x86_64/stable/Packages/`
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and download the `.rpm` file for the Docker version you want to install.
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> **Note**: To install a **nightly** or **test** (pre-release) package,
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> change the word `stable` in the above URL to `nightly` or `test`.
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> [Learn about **nightly** and **test** channels](index.md).
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2. Install Docker Engine, changing the path below to the path where you downloaded
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the Docker package.
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```bash
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$ sudo yum install /path/to/package.rpm
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```
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Docker is installed but not started. The `docker` group is created, but no
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users are added to the group.
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3. Start Docker.
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```bash
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$ sudo systemctl start docker
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```
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4. Verify that Docker Engine is installed correctly by running the `hello-world`
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image.
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```bash
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$ sudo docker run hello-world
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```
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This command downloads a test image and runs it in a container. When the
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container runs, it prints an informational message and exits.
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Docker Engine is installed and running. You need to use `sudo` to run Docker commands.
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Continue to [Post-installation steps for Linux](linux-postinstall.md) to allow
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non-privileged users to run Docker commands and for other optional configuration
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steps.
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#### Upgrade Docker Engine
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To upgrade Docker Engine, download the newer package file and repeat the
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[installation procedure](#install-from-a-package), using `yum -y upgrade`
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instead of `yum -y install`, and pointing to the new file.
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{% include install-script.md %}
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## Uninstall Docker Engine
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1. Uninstall the Docker Engine, CLI, and Containerd packages:
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```bash
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$ sudo yum remove docker-ce docker-ce-cli containerd.io
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```
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2. Images, containers, volumes, or customized configuration files on your host
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are not automatically removed. To delete all images, containers, and
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volumes:
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```bash
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$ sudo rm -rf /var/lib/docker
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```
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You must delete any edited configuration files manually.
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## Next steps
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- Continue to [Post-installation steps for Linux](linux-postinstall.md).
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- Review the topics in [Develop with Docker](../../develop/index.md) to learn how to build new applications using Docker.
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