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# 使用 Docker 镜像 # Use Docker Images
在之前的介绍中我们知道镜像是 Docker 的三大组件之一 As we have introduced before, `image` is one of the 3 major components of Docker.
Docker 运行容器前需要本地存在对应的镜像如果本地不存在该镜像Docker 会从镜像仓库下载该镜像 Upon running docker container, it can run local image or if the image is not locally available, it will download from a registry.
本章将介绍更多关于镜像的内容包括 In this chapter we will introduce more about `image`, including
* 从仓库获取镜像 * Pull images from registry
* 管理本地主机上的镜像 * Manage local images
* 介绍镜像实现的基本原理 * The mechanisms and implementaion of images