Hello!
Please forgive my bad English, I live in France.
Summary: how to cache - with Varnish - Open Street Map PNG images
without overloading OSM tiles servers?
The question seems related to Varnish backends and ".max_connections"
parameter.
A far as I know, if ".max_connections" is reached for a backend, Varnish
sends 503 http errors.
I understand the logic but would it be possible to queue these incoming
requests and wait until the selected backend is really available?
backend a_tile {
.host = "a.tile.openstreetmap.org";
.port = "80";
.max_connections = 2;
}
If Varnish have, let's say 100 incoming requests in 1 second, how can I
handle this "spike" without overloading the backend?
All my google searches were "dead ends" so I think the question is
poorly formulated.
Note 1 : using [random|round_robin] directors could be a temporary solution
Note 2 : libvmod-dynamic is great but does not limit backend
simultaneous connexions
Many thanks for your help!
--
tranxene50
[email protected]
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