具体错误：Error response from daemon: conflict: unable to delete f2e2f7b8308b (must be forced) - image is being used by stopped container 51d010d3b755
错误解析：这是由于要删除的目标镜像中有容器存在，故无法删除镜像
解决办法：先删除镜像中的容器，再删除该镜像。
docker rm 容器id docker rmi 镜像id
