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I need to keep alive my connection between nginx and upstream nodejs.
Just compiled and installed nginx 1.2.0
my configuration file:
upstream backend { ip_hash; server dev:3001; server dev:3002; server dev:3003; server dev:3004; keepalive 128; } server { listen 9000; server_name dev; location / { proxy_pass http://backend; error_page 404 = 404.png; } } My programe (dev:3001 - 3004) detect that the connection was closed by nginx after response.
document
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Upstream Domain Resolve¶ Its buffer has the latest IPs of the backend domain name and it integrates with the configured load balancing algorithm (least_conn, hash, etc) or the built in round robin if none is explicitly defined. At every interval (one second by default), it resolves the domain name.
In Nginx, keepalive is a directive that is utilized for keeping the connection open for a certain number of requests to the server or until the request timeout period has expired.
fail_timeout = time sets. the time during which the specified number of unsuccessful attempts to communicate with the server should happen to consider the server unavailable; and the period of time the server will be considered unavailable.
With ip-hash, the client's IP address is used as a hashing key to determine what server in a server group should be selected for the client's requests. This method ensures that the requests from the same client will always be directed to the same server except when this server is unavailable.
The documentation states that for http keepalive, you should also set proxy_http_version 1.1; and proxy_set_header Connection "";
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