本文将详细介绍在工作中碰到的docker卸载问题进行阐述内容如下：

docker 卸载不干净
例如：
官网介绍docker卸载的方法一般为
1> yum remove docker-ce -y
2> rm -fr /var/lib/docker*
但试过后你依然无法安装新版本，尤其是高版本降到低版本docker，问题在于docker你并没有卸载干净
正确的卸载方法如下：
1> yum list installed|grep docker 查看
2> yum remove [docker名称]
注：上述命令可以查询到未删除干净的docker残留，一般这种情况出现于docker 18.09.3版本上

示例：

[root@k8s-node02 k8s]# yum list installed|grep docker
containerd.io.x86_64 1.2.5-3.1.el7 @docker-ce-stable

docker-ce.x86_64
3:18.09.4-3.el7
@docker-ce-stable
docker-ce-cli.x86_64
1:18.09.4-3.el7
@docker-ce-stable

[root@k8s-node02 k8s]# yum remove docker-ce.x86_64
Loaded plugins: fastestmirror, langpacks
Resolving Dependencies
--> Running transaction check
---> Package docker-ce.x86_64 3:18.09.4-3.el7 will be erased
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository Size

Removing:
docker-ce x86_64 3:18.09.4-3.el7 @docker-ce-stable 81 M

Transaction Summary

Remove 1 Package

Installed size: 81 M
Is this ok [y/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
/usr/bin/dockerd has not been configured as an alternative for dockerd
Erasing : 3:docker-ce-18.09.4-3.el7.x86_64 1/1
Verifying : 3:docker-ce-18.09.4-3.el7.x86_64 1/1

Removed:
docker-ce.x86_64 3:18.09.4-3.el7

Complete!
[root@k8s-node02 k8s]# yum remove docker-ce-cli.x86_64
Loaded plugins: fastestmirror, langpacks
Resolving Dependencies
--> Running transaction check
---> Package docker-ce-cli.x86_64 1:18.09.4-3.el7 will be erased
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository Size

Removing:
docker-ce-cli x86_64 1:18.09.4-3.el7 @docker-ce-stable 66 M

Transaction Summary

Remove 1 Package

Installed size: 66 M
Is this ok [y/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Erasing : 1:docker-ce-cli-18.09.4-3.el7.x86_64 1/1
Verifying : 1:docker-ce-cli-18.09.4-3.el7.x86_64 1/1

Removed:
docker-ce-cli.x86_64 1:18.09.4-3.el7

Complete!
[root@k8s-node02 k8s]#
[root@k8s-node02 k8s]#
[root@k8s-node02 k8s]#
[root@k8s-node02 k8s]# ls
flannel.sh flannel-v0.11.0-linux-amd64.tar.gz README.md
[root@k8s-node02 k8s]#
[root@k8s-node02 k8s]# docker version
-bash: /usr/bin/docker: No such file or directory

查看版本在安装

[root@k8s-node02 k8s]# yum list docker-ce.x86_64 --showduplicates|sort -r

• updates: mirrors.huaweicloud.com
  Loading mirror speeds from cached hostfile
  Loaded plugins: fastestmirror, langpacks
• extras: mirrors.163.com
  docker-ce.x86_64 3:18.09.5-3.el7 docker-ce-stable
  docker-ce.x86_64 3:18.09.4-3.el7 docker-ce-stable
  docker-ce.x86_64 3:18.09.3-3.el7 docker-ce-stable
  docker-ce.x86_64 3:18.09.2-3.el7 docker-ce-stable
  docker-ce.x86_64 3:18.09.1-3.el7 docker-ce-stable
  docker-ce.x86_64 3:18.09.0-3.el7 docker-ce-stable
  docker-ce.x86_64 18.06.3.ce-3.el7 docker-ce-stable
  docker-ce.x86_64 18.06.2.ce-3.el7 docker-ce-stable
  docker-ce.x86_64 18.06.1.ce-3.el7 docker-ce-stable
  docker-ce.x86_64 18.06.0.ce-3.el7 docker-ce-stable
  docker-ce.x86_64 18.03.1.ce-1.el7.centos docker-ce-stable
  docker-ce.x86_64 18.03.0.ce-1.el7.centos docker-ce-stable
  docker-ce.x86_64 17.12.1.ce-1.el7.centos docker-ce-stable
  docker-ce.x86_64 17.12.0.ce-1.el7.centos docker-ce-stable
  docker-ce.x86_64 17.09.1.ce-1.el7.centos docker-ce-stable
  docker-ce.x86_64 17.09.0.ce-1.el7.centos docker-ce-stable
  docker-ce.x86_64 17.06.2.ce-1.el7.centos docker-ce-stable
  docker-ce.x86_64 17.06.1.ce-1.el7.centos docker-ce-stable
  docker-ce.x86_64 17.06.0.ce-1.el7.centos docker-ce-stable
  docker-ce.x86_64 17.03.3.ce-1.el7 docker-ce-stable
  docker-ce.x86_64 17.03.2.ce-1.el7.centos docker-ce-stable
  docker-ce.x86_64 17.03.1.ce-1.el7.centos docker-ce-stable
  docker-ce.x86_64 17.03.0.ce-1.el7.centos docker-ce-stable
• base: mirrors.huaweicloud.com
  Available Packages
  [root@k8s-node02 k8s]# yum install docker-ce-18.09.0-3.el7 -y # 此处需要去除3：,不然是无法安装的
  Loaded plugins: fastestmirror, langpacks
  Loading mirror speeds from cached hostfile
• base: mirrors.huaweicloud.com
• extras: mirrors.163.com
• updates: mirrors.huaweicloud.com
  Resolving Dependencies
  --> Running transaction check
  ---> Package docker-ce.x86_64 3:18.09.0-3.el7 will be installed
  --> Processing Dependency: docker-ce-cli for package: 3:docker-ce-18.09.0-3.el7.x86_64
  --> Running transaction check
  ---> Package docker-ce-cli.x86_64 1:18.09.5-3.el7 will be installed
  --> Finished Dependency Resolution

Dependencies Resolved

============================================================================================================================================================================
Package Arch Version Repository Size

Installing:
docker-ce x86_64 3:18.09.0-3.el7 docker-ce-stable 19 M
Installing for dependencies:
docker-ce-cli x86_64 1:18.09.5-3.el7 docker-ce-stable 14 M

Transaction Summary

Install 1 Package (+1 Dependent package)

Total download size: 33 M
Installed size: 147 M
Downloading packages:
(1/2): docker-ce-cli-18.09.5-3.el7.x86_64.rpm | 14 MB 00:00:02
(2/2): docker-ce-18.09.0-3.el7.x86_64.rpm | 19 MB 00:00:03

Total 9.4 MB/s | 33 MB 00:00:03
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : 1:docker-ce-cli-18.09.5-3.el7.x86_64 1/2
Installing : 3:docker-ce-18.09.0-3.el7.x86_64 2/2
Verifying : 1:docker-ce-cli-18.09.5-3.el7.x86_64 1/2
Verifying : 3:docker-ce-18.09.0-3.el7.x86_64 2/2

Installed:
docker-ce.x86_64 3:18.09.0-3.el7

Dependency Installed:
docker-ce-cli.x86_64 1:18.09.5-3.el7

Complete!

启动docker

[root@k8s-node02 k8s]# systemctl start docker

查看docker

[root@k8s-node02 k8s]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c26df78ca551 busybox "sh" 2 weeks ago