### 参考文档 * [Docker 官方 CentOS 安装文档](https://docs.docker.com/install/linux/docker-ce/centos/)。 ## Get Docker CE for CentOS ### 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). The`overlay2`storage driver is recommended. recommended推荐 Docker CE 支持 64 位版本 CentOS 7，并且要求内核版本不低于 3.10。 CentOS 7 满足最低内核的要求，但由于内核版本比较低，部分功能（如`overlay2`存储层驱动）无法使用，并且部分功能可能不太稳定。 ### Uninstall old versions Older versions of Docker were called`docker`or`docker-engine`. If these are installed, uninstall them, along with associated dependencies. ~~~ sudo yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine ~~~ ### 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 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. ~~~ sudo yum install -y yum-utils \ device-mapper-persistent-data \ lvm2 ~~~ 2. Use the following command to set up the **stable** repository. ~~~ #国内源 sudo yum-config-manager \ --add-repo \ https://mirrors.ustc.edu.cn/docker-ce/linux/centos/docker-ce.repo # 官方源 sudo yum-config-manager \ --add-repo \ https://download.docker.com/linux/centos/docker-ce.repo ~~~ #### INSTALL DOCKER CE ~~~ sudo yum makecache fast sudo yum install docker-ce ~~~ 1. Install the*latest version*of Docker CE and containerd, or go to the next step to install a specific version: ~~~ sudo yum install docker-ce docker-ce-cli containerd.io ~~~ To install a*specific version*of Docker CE, list the available versions in the repo, then select and install: ~~~ yum list docker-ce --showduplicates | sort -r ~~~ ### 添加内核参数 如果在 CentOS 使用 Docker CE 看到下面的这些警告信息： ~~~ WARNING: bridge-nf-call-iptables is disabled WARNING: bridge-nf-call-ip6tables is disabled ~~~ 请添加内核配置参数以启用这些功能。 ~~~ sudo tee -a /etc/sysctl.conf <<-EOF net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF ~~~ 然后重新加载`sysctl.conf`即可 ~~~ sudo sysctl -p ~~~ ## **Uninstall Docker CE** 1. Uninstall the Docker package: ~~~ $ 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: ~~~ sudo rm -rf /var/lib/docker ~~~