yum版本号前有:冒号 指的是依赖版本号，默认0不显示

官方介绍：http://rpm-packaging-guide.github.io/#epoch

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[root@CentOs7 ～]# yum list docker --showduplicates   已加载插件：fastestmirror, priorities Loading mirror speeds from cached hostfile 28 packages excluded due to repository priority protections 可安装的软件包 docker.x86_64                      2:1.12.6-55.gitc4618fb.el7.centos                       c7-media

　看到版本号前是2:1.12.6，1.12.6是版本号，是常见的，但是2:是什么意思，google了一下，发现这个是rpm包的命名规范，即使不写也会默认为0，是指的依赖版本号

中文RPM包信息： 看到  "时期 ：2"

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[root@CentOs7 ～]# yum info docker-1.12.6 已加载插件：fastestmirror, priorities Loading mirror speeds from cached hostfile 28 packages excluded due to repository priority protections 可安装的软件包 名称    ：docker 架构    ：x86_64 时期       ：2 版本    ：1.12.6 发布    ：55.gitc4618fb.el7.centos 大小    ：15 M 源    ：c7-media_CentOS 简介    ： Automates deployment of containerized applications 网址    ：https://github.com/docker/docker 协议    ： ASL 2.0 描述    ： Docker is an open-source engine that automates the deployment of any          : application as a lightweight, portable, self-sufficient container that will          : run virtually anywhere.          :          : Docker containers can encapsulate any payload, and will run consistently on          : and between virtually any server. The same container that a developer builds          : and tests on a laptop will run at scale, in production*, on VMs, bare-metal          : servers, OpenStack clusters, public instances, or combinations of the above.

　　

英文RPM包信息：对应的的是Epoch

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[root@CentOs7 yum.repos.d]# yum info docker-1.12.6 Loaded plugins: fastestmirror, priorities Loading mirror speeds from cached hostfile 28 packages excluded due to repository priority protections Available Packages Name        : docker Arch        : x86_64 Epoch       : 2 Version     : 1.12.6 Release     : 55.gitc4618fb.el7.centos Size        : 15 M Repo        : c7-media_CentOS Summary     : Automates deployment of containerized applications URL         : https://github.com/docker/docker License     : ASL 2.0 Description : Docker is an open-source engine that automates the deployment of any             : application as a lightweight, portable, self-sufficient container that will             : run virtually anywhere.             :             : Docker containers can encapsulate any payload, and will run consistently on             : and between virtually any server. The same container that a developer builds             : and tests on a laptop will run at scale, in production*, on VMs, bare-metal             : servers, OpenStack clusters, public instances, or combinations of the above.

　　

 

 参考：

http://unix.stackexchange.com/questions/543384/what-is-the-meaning-of-1-in-the-version-of-a-yum-package