I've been trying to get this setup working:
client <- c0 -> nginx1 <- c1 -> nginx2 <- c2 -> service (http)

where the c1 connection is kept alive between request from from the outside, but c0 and c2 are closed after each request. I've used the 'keepalive' keyword in the upstream nginx1 config, and it works. Unfortunately I also use the upstream hash patch on nginx1, and as soon as I enable that nginx1 closes the connection forcefully. I've confirmed this with tcpdump in both setups, and it's the only difference. Any hints to what I can do?

I'm suspecting that the upstream hash module "takes over" the upstream handling, and thus ignores the 'keepalive' keyword, but I'm randomly guessing.

Thanks,

Allan