结果如下：
docker: /usr/yxdc/docker /etc/docker /usr/libexec/docker /usr/share/man/man1/docker.1.gz 3.删除docker文件使用rm -rf命令删除这些文件
如：
sudo rm -rf /usr/yxdc/docker删除后，可以使用docker或which命令
dream@dream-PC:~$ dockerbash: docker: 未找到命令dream@dream-PC:~$ which dockerdream@dream-PC:~$可以看到docker已被卸载
安装 1.安装docker密钥 dream@dream-PC:~$ curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -OK 2.查看秘钥是否安装成功 dream@dream-PC:~$ sudo apt-key fingerprint 0EBFCD88pub rsa4096 2017-02-22 [SCEA] 9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88uid [ unknown] Docker Release (CE deb) <docker@docker.com>sub rsa4096 2017-02-22 [S] 3.添加docker官方仓库 sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian wheezy stable"上面命令中wheezy为debian版本号的代号，可通过cat /etc/debian_version查看版本，对应代号关系如下：
deepin15.5 ==> debian8.0 ==> jessiedeepin15.9.2 ==> debian9.0 ==> stretchdeepin20 ==> debian10 ==> buster这里会报错，但不会影响docker正常安装
aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for Deepin/camel 4.安装docker-ce sudo apt-get install docker-ce 5.查看docker版本 dream@dream-PC:~$ docker versionClient: Docker Engine - Community Version: 19.03.12 API version: 1.40 Go version: go1.13.10 Git commit: 48a66213fe Built: Mon Jun 22 15:45:52 2020 OS/Arch: linux/amd64 Experimental: falseServer: Docker Engine - Community Engine: Version: 19.03.12 API version: 1.40 (minimum version 1.12) Go version: go1.13.10 Git commit: 48a66213fe Built: Mon Jun 22 15:44:23 2020 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.2.13 GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429 runc: Version: 1.0.0-rc10 GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd docker-init: Version: 0.18.0 GitCommit: fec3683 6.运行hello-world容器 dream@dream-PC:~$ sudo docker run hello-worldUnable to find image 'hello-world:latest' locallylatest: Pulling from library/hello-world0e03bdcc26d7: Pull complete Digest: sha256:d58e752213a51785838f9eed2b7a498ffa1cb3aa7f946dda11af39286c3db9a9Status: Downloaded newer image for hello-world:latestHello from Docker!This message shows that your installation appears to be working correctly.To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. (amd64) 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal.To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bashShare images, automate workflows, and more with a free Docker ID: https://hub.docker.com/For more examples and ideas, visit: https://docs.docker.com/get-started/可以看到15行，显示docker可以正常运行了。
由于系统盘容量较小，所以想将docker的相关文件移动到数据盘。
修改docker数据目录修改/etc/docker/daemon.json
若没有daemon.json文件，使用以下命令可自动创建
dream@dream-PC:~$ sudo vim /etc/docker/daemon.json在该文件中写入以下数据
{ "data-root": "/home/dream/docker"}目录可以自定义
重启docker
systemctl restart docker查看该目录，可以看到相关文件
dream@dream-PC:~$ cd /home/dream/docker/dream@dream-PC:~/docker$ lsbuilder containers network plugins swarm trustbuildkit image overlay2 runtimes tmp volumesdream@dream-PC:~/docker$ 添加docker镜像源还是修改daemon.json文件
在文件中加入镜像源地址，daemon.json内容如下：
{ "data-root": "/home/dream/docker", "registry-mirrors": ["http://registry.docker-cn.com", "http://hub-mirror.c.163.com", "http://docker.mirrors.ustc.edu.cn"]}