docker省去了一些繁琐的步骤
在我们安装Mysql并且部署的时候需要配置文件，还需要安装依赖，但是在docker中我们只需要一条命令，然后等待docker操作完，我们的mysql就部署好了，这是为什么呢？举一个例子，就是当我们网上下载一些应用或者是一些游戏的时候，他可能会有绿色免安装版，也就是将软件安装好配置好的一些文件，将这些文件打包成一个压缩包，将这个压缩包给我们，里面的依赖、配置都是已经调试好的，我们解压完就可以使用了。docker其实就类似于这种绿色免安装版
镜像和容器
所谓的这个绿色免安装版的文件在docker中被称为镜像。我们利用docker安装应用时，docker会自动搜索并下载应用镜像（image），其中镜像中就包含了运行所需要的环境、配置、系统库函数。并且docker在运行镜像的时候会创建一个隔离的环境，成为容器（container）。这也导致了只要这个东西能够运行，那么docker打包完之后到了任意一个环境都可以运行起来
多开
我们下载完Mysql的镜像后，我们先开启一个成为A，紧接着我们再次开启B的时候，不需要再次去下载mysql的镜像，可以直接用前面下载过的镜像，并且这个B环境和A环境是互相隔离的互不影响，这就相当于你安装完QQ这个应用程序之后，你可以在一台电脑上同时运行多个QQ登录多个不同的QQ号，并且这几个QQ进程互相之间是不会干扰的
镜像仓库
存储和管理镜像的平台，docker官方的镜像仓库：hub.docker.com，国内的镜像仓库：阿里云、华为云等都有镜像仓库
我们使用docker去部署时需要用到镜像，这些镜像就是存储在镜像仓库，当我们需要的时候运行命令，docker就回去镜像仓库寻找并下载镜像
23人评论了“快速认识docker（docker简介）”
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