Docker镜像无法被删除的解决方法
1.查看当前所有镜像docker images
http://i2.运维网.com/images/blog/201808/10/ca1b95e353ef3bd417dae6a0a820f369.png
2.删除镜像ubuntu，提示报错，如下图（这里提示镜像有被容器再使用中）
Error response from daemon: conflict: unable to remove repository reference "ubuntu" (must force) - container 23107e15cef9 is using its referenced image 735f80812f90
http://i2.运维网.com/images/blog/201808/10/8d100c87f059eb53ecc29026545cd9cc.png
解决方法如下：
1.先删除ubuntu的容器，会存在多个容器占用同一个镜像的问题，请重复删除即可（由以上报错信息可知：container ID:23107e15cef9 name:ubuntu)
docker rm 23107e15cef9
http://i2.运维网.com/images/blog/201808/09/78ad0c0debf4a10211fe0a6a00113e50.png
2.再删除ubuntu镜像，并查看所有镜像，已经成功删除该镜像
docker rmi ubuntu
http://i2.运维网.com/images/blog/201808/09/03616885f3ac437e607e9b0c23d3fc38.png
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