[Tilesathome] Two new ROMA...

[Matthias Julius]

Mathieu Arnold <mat at mat.cc> writes:

> I'm pleased to announce that there are now three ROMA servers, the new two
> are located at frdrmd.roma.osm.phyrefile.com, api1.osm.absolight.net.

Great!

>
> There may be some rough edges, but both have been serving a few clients for
> some time now.
>
> There also is a haproxy (which may still need tuning, but, hey, can't know
> that untill more people use it.) located on the last server, the simplest way
> to use it would be to put :
>
> API_ROMA = http://api1.osm.absolight.net:8080/api/%v/map?bbox=%b
>
> in your tilesAtHome.conf.
>
> If you don't want to change that old ROMA url, you could do :
>
> APIServers = ROMA2,API,ROMA,XAPI
> API_ROMA2 = http://api1.osm.absolight.net:8080/api/%v/map?bbox=%b
>
> which would let you keep a backup in case the haproxy goes down and the main
> API and the XAPI goes down too :-)

With more API servers available we should start thinking about some
load balancing.  There is no point in having one server sweat and the
others getting bored.

One way could be to have the client try all APIServers in random order
instead of the order defined in the config.

Another way could be round-robin DNS which would not require the
client config to be changed when a API server goes on- or offline.
The drawback would be that the client would not know anymore which
server it actually had tried which might make it more difficult to
find out what server is going crazy.

Better ideas?

Matthias