[CentOS-mirror] mirrorlist.centos.org Query

Justin Coffman

justin at netsecu.red
Wed Apr 8 12:37:27 UTC 2015


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I’m curious as to how queries to mirrorlist.centos.org are processed.

For example, querying mirrorlist from my CentOS mirror:

justin at bruce:~$ curl -s "http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os" | sort
ftp://ftp.ussg.iu.edu/linux/centos/7.1.1503/os/x86_64/
http://centos.eecs.wsu.edu/7.1.1503/os/x86_64/
http://centos.sonn.com/7.1.1503/os/x86_64/
http://ftp.usf.edu/pub/centos/7.1.1503/os/x86_64/
http://mirror.beyondhosting.net/CentOS/7.1.1503/os/x86_64/
http://mirror.clarkson.edu/centos/7.1.1503/os/x86_64/
http://mirror.metrocast.net/centos/7.1.1503/os/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/7.1.1503/os/x86_64/
http://mirror.trouble-free.net/centos/7.1.1503/os/x86_64/
http://reflector.westga.edu/repos/CentOS/7.1.1503/os/x86_64/

Same query from my home system about a thousand miles away:

justin at selina:~$ curl -s "http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os" | sort
ftp://ftp.ussg.iu.edu/linux/centos/7.1.1503/os/x86_64/
http://centos.eecs.wsu.edu/7.1.1503/os/x86_64/
http://centos.sonn.com/7.1.1503/os/x86_64/
http://ftp.usf.edu/pub/centos/7.1.1503/os/x86_64/
http://mirror.beyondhosting.net/CentOS/7.1.1503/os/x86_64/
http://mirror.clarkson.edu/centos/7.1.1503/os/x86_64/
http://mirror.metrocast.net/centos/7.1.1503/os/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/7.1.1503/os/x86_64/
http://mirror.trouble-free.net/centos/7.1.1503/os/x86_64/
http://reflector.westga.edu/repos/CentOS/7.1.1503/os/x86_64/

How is the list of responses to mirrorlist queries determined? Obviously, it can’t return the full mirrorlist by country or something, that wouldn’t be efficient when yum-fastestmirror runs.
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