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==Introduction==
==Introduction==
A content delivery network or content distribution network (CDN) is a system of computers containing copies of data, placed at various points in a network so as to maximize bandwidth for access to the data from clients throughout the network. A client accesses a copy of the data near to the client, as opposed to all clients accessing the same central server, thereby causing a bottleneck near that server.
A content delivery network or Content Delivery Network (CDN) is a system of computers containing copies of data, placed at various points in a network so as to maximize bandwidth for access to the data from clients throughout the network. A client accesses a copy of the data near to the client, as opposed to all clients accessing the same central server, thereby causing a bottleneck near that server.
==Goals==
==Goals==
* Reduce bandwidth at primary download server.
* Reduce bandwidth at primary download server.
* Improve quality of service for users.
* Improve quality of service for users.
* Move content closer to users.
* Move content closer to users, thus reducing latency.
==Mirrors==
The current list of available mirrors is available at http://mirrors.sugarlabs.org/
==Setting up a Mirror==
==Setting up a Mirror==
Setting up a mirror is very easy. All you need is a web server which is available via http, and (if possible) rsync.
Setting up a mirror is very easy. All you need is a web server which is available via http, and (if possible) rsync.
Please contact systems@sugarlabs.org if you are interested.
Please contact sysadmin AT sugarlabs DOT org if you are interested in hosting a mirror.
== System Summary ==
== System Summary ==
=== Mirrors ===
=== Mirrors ===
[http://mirrors.sugarlabs.org Mirrors] are completely passive. To set up a mirror, a mirror system administrator needs to:
[http://mirrors.sugarlabs.org Mirrors] are completely passive. To set up a mirror, a mirror system administrator needs to:
* Set up rsync job to synchronise a copy of the files on downloads.sugarlabs.org onto their local system.
* Set up rsync job to synchronize a copy of the files on http://downloads.sugarlabs.org onto their local system.
* Publish the files via HTTP and -- if possible -- rsync. Rsync allows for efficient [http://www.mirrorbrain.org/features/#mirror-monitoring mirror monitoring] (scanning). FTP is less efficient, but still preferred over an HTTP-only mirror.
* Publish the files via HTTP and -- if possible -- rsync. Rsync allows for efficient [http://www.mirrorbrain.org/features/#mirror-monitoring mirror monitoring] (scanning). FTP is less efficient, but still preferred over an HTTP-only mirror.
* Alert the Sugar Labs system administrators that they would like their mirror into rotation, including the following information in the request:
* Alert the Sugar Labs system administrators that they would like their mirror into rotation, including the following information in the request:
** rsync base URL of the files on the mirror
** rsync base URL of the files on the mirror
=== Redirector ===
=== Adding a new mirror to the Mirror Brain redirector ===
* Choose a name for the mirror, usually the host name.
* Choose a name for the mirror, usually the host name.