CentOS 7.1, there are many versions to choose from when downloading, how to choose?
DVD version : This is the commonly used version, which is the normal installation version. It is recommended that you install it. It contains a large number of commonly used software. In most cases, there is no need to download it online. The volume is 4G.
Everything Edition : As the name suggests, it includes all software components, and of course the volume is huge, up to 7G.
LiveCD version : It is a CD-ROM CentOS system. You can start the computer through the CD-ROM, and start the CentOS system. It also has a graphical interface and a terminal. It can also be installed to a computer, but some content may also need to be downloaded from the website again (automatically).
Minimal version : A simplified version, including core components, with a volume of only more than 600 MB.
NetInstall version : As the name implies, this version is generally not used for the network installation version.
I chose the CentOS-7-x86_64-DVD-1503-01.iso version. In addition, there are 32-bit and 64-bit issues. It is recommended to install 64-bit with the current computer configuration. The file that contains "x86_64" is the 64-bit version, otherwise it is 32-bit.