Recommend several Linux OS images

1. http://mirror.nsc.liu.se/

Only for centos system, download directory centos-store. wget is very fast.

2. http://mirror.symnds.com/

The system is complete and the download speed is average.

3. http://ftp.cae.tntech.edu/

The system is complete and the download speed is fast.

4. http://down.zhujiwiki.com/

Only the system I use regularly.

5. Debian Global Mirror Site

http://www.debian.org/mirror/list

6. CentOS official mirror source

http://mirror.centos.org/