docker commit了一个镜像之后想删除旧的镜像，出现以下报错
Error response from daemon: conflict: unable to delete 6f8214d56bfc (cannot be forced) - image has dependent child images
解决思路：
docker save保存容器
docker images
docker save REPOSITORY > XX.tar
删除镜像容器
docker ps -a
docker rm CONTAINER ID
docker images
docker rmi IMAGE ID
最后再导入回去
docker load < XX.tar
原文链接：docker rmi报错Error response from daemon，转载请注明来源！
