We’re trying to set a bunch of Apaches 2.4.18 to proxy pass the requests it receives to our partner's upstream server. Our partner uses Amazon’s Elastic Load Balancing and thus the only we know about their servers is its DNS names.
The TTL of the DNS records is 60 seconds and I’d like to know if Apache can honour that ttl, keeping the connection alive as long as the DNS record is valid and then requesting the translation when the TTL has expired.
Using mod_proxy DisableReuse = on forces opening a new connection every time a resource is needed upstream. That would do the trick as long as the underneath operating system does the DNS TTL caching. If not, every time a new resource is needed Apache will force a new DNS request, increasing the response time.
I’ve thought of playing with the mod_proxy ttl and timeout parameters, but I think I’m not correctly solving the problem. According to the docs, the mod_proxy’s timeout parameter controls the time a socket will wait for data from upstream, but I’m not sure if the Apache instance will close the connection an open a new one. Also, playing with the timeout is error prone, because a lower value may sent an wrong answer to the client.
I’ve spend a few time trying to tackle this setup with no joy. Is there any special setup to cover that scenario? Or perhaps I’ve skipped something? Any help would be appreciated.