Ok after poking around some more - AWS EC2 spot instances have 2 minute warning.
Pound has poundctl which sends message to pound on the control port which one can disable backends. It seems these two facilities should allow one to gracefully deal with backends which are AWS EC2 spot instances going to be terminated. johnh... ________________________________ From: John Hayward <john.hayw...@wheaton.edu> Sent: Friday, October 23, 2015 10:12 AM To: pound@apsis.ch Subject: [Pound Mailing List] Backend down notification We have pound setup with some spot market AWS EC2 instances as some of the backends. Spot instances can suddenly be taken off line. It seems that it takes a while for pound to respond to events like this - according to another post several tcp connections refused or not respond for pound to recognize the server is "dead". If we set up an external monitoring of the backends and detect that some are down (or likely to go down shortly because of pricing of the spot market) is there a way to inform pound that server x is now dead as opposed to waiting for pound to discover it on it's own? Other systems like bind have facilities to send a signal to reload the config file but I did not see a facility like that in pound. TIA johnh...
