下载docker相关rpm包进行安装

1. 下载地址: https://download.docker.com/linux/centos/7/x86_64/stable/Packages/
2. 下载安装所需的包至同一目录:

   containerd.io-1.6.9-3.1.el7.x86_64.rpm
   docker-ce-cli-20.10.21-3.el7.x86_64.rpm
   docker-ce-20.10.21-3.el7.x86_64.rpm
   docker-ce-rootless-extras-20.10.21-3.el7.x86_64.rpm
   docker-scan-plugin-0.21.0-3.el7.x86_64.rpm
   docker-compose-plugin-2.12.2-3.el7.x86_64.rpm (安装docker compose)

3. 安装所有的包: yum install *.rpm (必须同时安装所有的包,不然会出现包之间相互依赖的问题)

修改docker的镜像地址

vim /etc/docker/daemon.json
{ "registry-mirrors": ["https://mirror.baidubce.com","https://hub-mirror.c.163.com","https://ustc-edu-cn.mirror.aliyuncs.com"] }

修改docker默认存储路径

• 修改路径:
  vim /usr/lib/systemd/system/docker.service
  ExecStart后添加--graph=/YourPath
  如果默认路径下有需要的数据则需要先把数据移动到新的路径下:
  mv /var/lib/docker /YourPath

• 重启docker:
  systemctl daemon-reload
systemctl restart docker

• 查看docker信息:
  docker info