On TCP connections held by NGinx, can it be configured to send TCP Keepalive
(Not HTTP KeepAlive!)
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Use the source, Luke. (but **why** would you want to do such a thing?) – symcbean Sep 16 '10 at 13:21
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So our firewall would not disconnect long lived connections. – ripper234 Oct 22 '10 at 20:51
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Why don't you just tell your firewall not to terminate long connections? – symcbean Oct 25 '10 at 08:03
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Because there might be other firewalls along the way - I don't control them all. – ripper234 Dec 03 '10 at 06:36
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Hi, did you manage to use so_keepalive in the http listen directive ? or did you go other way ? – Lonko Dec 24 '20 at 09:31
4 Answers
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You have 2 options:
- use stock
so_keepalivenginx option - use
nginx-tcp-keepalivemodule 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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Nicolas Viennot
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As far as I see the `so_keepalive` is on per server basis since it is option to `location` directive. The module allows that configuration per location basis, that can be significant difference in some cases. – myroslav Dec 12 '14 at 09:57
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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.)
poolie
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