VirtualBox 中练习安装linux系统centos7

1准备文件：

1. 1 下载安装Oracle VM VirtualBox

在windows中安装vbox很简单，只要下载好vbox软件，双击运行一直下一步就安装好了：下载地址：https://www.virtualbox.org/wiki/Downloads

1.2 下载centos7系统iso文件：

海量的高通量测序数据，windows是处理不了的。因此果断选择linux服务器，开源免费而且生物数据分析软件也免费。这里选择CentOS版本的linux作为服务器的操作系统。 Ubuntu系统适合安装到个人电脑中。下载地址：https://wiki.centos.org/Download

中国的镜像地址下载更多版本：

Alibaba Cloud Computing	http://mirrors.aliyun.com/centos/
Beijing Institute of Technology	http://mirror.bit.edu.cn/centos/
ChongQing University	http://mirrors.cqu.edu.cn/CentOS/
CN99 Corp.	http://mirrors.cn99.com/centos/
Dalian Neusoft University of Information	http://mirrors.neusoft.edu.cn/centos/
HUAWEI CLOUD	http://mirrors.huaweicloud.com/centos/
Lanzhou University Open Source Society	http://mirror.lzu.edu.cn/centos/
Nanjing University	http://mirrors.nju.edu.cn/centos/
NetEase	http://mirrors.163.com/centos/
Shanghai Jiao Tong University	http://ftp.sjtu.edu.cn/centos/
SysKiller Dev	http://ap.stykers.moe/centos/
Tsinghua University	http://mirrors.tuna.tsinghua.edu.cn/centos/
University of Science and Tech of China	http://mirrors.ustc.edu.cn/centos/
Zhejiang University	http://mirrors.zju.edu.cn/centos/

清华的镜像地址：https://mirrors.tuna.tsinghua.edu.cn/centos/7.9.2009/isos/x86_64/

版本说明

CentOS-7-x86_64-DVD-2009.iso
  This DVD image contains all the packages that can be installed using the
  installer. This is the recommended image for most users.

CentOS-7-x86_64-NetInstall-2009.iso
  This is the network install and rescue image. The installer will ask from 
  where it should fetch the packages to be installed. This image is most 
  useful if you have a local mirror of CentOS packages.

CentOS-7-x86_64-Everything-2009.iso
  This image contains the complete set of packages for  CentOS Linux 7. It can be 
  used for installing or populating a local mirror. This image needs a 16GB USB 
  flash drive as it is too large for DVD isos.

CentOS-7-x86_64-LiveGNOME-2009.iso
CentOS-7-x86_64-LiveKDE-2009.iso
  These images are Live images of  CentOS Linux 7. Depending on the name they use the
  respective display manager. They are designed for testing purposes and
  exploring the  CentOS Linux 7 environment. They will not modify the content of your 
  hard disk, unless you choose to install  CentOS Linux 7 from within the Live
  environment. Please be advised that you can not change the set of installed
  packages in this case. This needs to be done within the installed system
  using 'yum'.

CentOS-7-x86_64-Minimal-2009.iso
  The aim of this image is to install a very basic  CentOS Linux 7 system, with the 
  minimum of packages needed to have a functional system. Please burn this image
  onto a CD and boot your computer off it. A preselected set of packages will be
  installed on your system. Everything else needs to be installed using yum. The set
  of packages installed by this image is identical to the one installed when choosing
  the group named "Minimal" from the full DVD image.