docker_practice/basic_concept/image.md

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# Docker
Linux `root` Docker Image `root` `ubuntu:18.04` Ubuntu 18.04 `root`
Docker
##
`root` Docker [Union FS](https://en.wikipedia.org/wiki/Union_mount) 的技术,将其设计为分层存储的架构。所以严格来说,镜像并非是像一个 ISO 那样的打包文件,镜像只是一个虚拟的概念,其实际体现并非由一个文件组成,而是由一组文件系统组成,或者说,由多层文件系统联合组成。
西西
使