A bit of apache config to contribute.
At OsmAnd, we started building a tile server, however it is not very
powerfull, and is pre-rendered up to zoom 13 only. Thus we are making
some attempts to have a load balancer on another server, it look like this:
<VirtualHost *:80>
ServerAdmin webmaster@localhost
ServerName loadbalancer.osmand.net
<Proxy *>
Order allow,deny
Allow from all
</Proxy>
<Proxy balancer://hotcluster failonstatus=404>
BalancerMember http://tileserver.osmand.net status=+I
BalancerMember http://tile.openstreetmap.org status=+H
</Proxy>
ProxyPass / balancer://hotcluster/
LogLevel warn
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{X-Forwarded-Server}i\"
\"%{Referer}i\" \"%{User-Agent}i\" duration:%T/%D io:%$
CustomLog ${APACHE_LOG_DIR}/access.log lb
</VirtualHost>
When a tile is requested to loadbalancer.osmand.net, it is proxied to
tileserver.osmand.net.
On this tile server, mod_tile will return a 404 if the requested tile is
not available after 5 seconds. After this 404, then
loadbalancer.osmand.net request the tile to tile.openstreetmap.org until
tileserver.osmand.net is back.
Any comment, flaws detected or hints highly appreciated.
Yves
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