At present, the mainstream is U disk installation, so let's start with the U disk.
Ccentos 7 has several image versions
CentOS-7.0-1406-x86_64-DVD.iso: this image (DVD image) includes all the installation packages that can be installed with the installer, a recommended image for most users.
CentOS-7.0-1406-x86_64-NetInstall.iso: this image is used to install from the network or to rescue the system. When installing the system, the installer will ask where to get the installation package, which is recommended for users with centos local images.
CentOS-7.0-1406-x86_64-Everything.iso: this image contains a complete package for centos7 that can be used to install the system or fill in local images that require a dual-sided DVD or a USB flash drive above 8 GB.
CentOS-7.0-1406-x86_64-GnomeLive.iso
CentOS-7.0-1406-x86_64-KdeLive.iso (about 1 GB per size)
: These two images are real-time images of centos. Different display managers (gnome or KDE) are displayed for different names)
They can be used to explore or test the centos7 environment. They generally do not change the hard disk environment unless you install them in the live environment. This image must be installed on the installed system using yum ..
CentOS-7.0-1406-x86_64-livecd.iso: this image is a bit like the gnomelive above, but there is no installation package like libreoffice, this image is small enough to easily burn on CD ..
Currently, the burning software is in the FAT32 format, but the everything. ISO is larger than 4 GB and cannot be copied to the USB flash drive. Therefore, you can select the DVD. ISO file to be smaller than 4 GB.
Installation URL
Http://blog.sina.com.cn/s/blog_ea91389e0102uxo5.html
Centos 7 Installation