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ripper234
Asked: 2010-09-17 01:54:09 +0800 CST

Is it possible to configure Nginx to send TCP keepalive?

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On TCP connections held by NGinx, can it be configured to send TCP Keepalive

(Not HTTP KeepAlive!)

nginx tcpip

4 Answers

  1. You have 2 options:

    • use stock so_keepalive nginx option
    • use nginx-tcp-keepalive module directives

    listen ... so_keepalive=on

    listen directive with so_keepalive option is server level. See http://nginx.org/en/docs/http/ngx_http_core_module.html#listen for full documentation. This option is available since 2011-12-12 in nginx 1.1.11 and later.

    tcp_keepalive=on

    The nginx-tcp-keepalive module of Nicolas Viennot provides family of tcp_keep* directives that are location level. This module should work properly on modern Linux and BSD systems. Mac OS X support is limited to tcp_keepalive only. The module was originally releases approximately in the moment when nginx gained the so_keepalive option. I hadn't tried if the module is still compatible with newer version of nginx.

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  3. At the moment, only mail proxy module supports "so_keepalive" directive.

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  4. There is as LD_PRELOAD module that turns keepalives on, even if the app doesn't have an option to do so. (I don't know if it works with nginx or not.)

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