On Thu, Feb 25, 2021 at 09:31:36PM -0500, allenhe wrote:
Hi there,
> As we know there are some keepalive options in the nginx http modules to
> reuse tcp connections,
That is: the http protocol, which nginx speaks both as a server and as
a client, includes a facility to request that multiple requests can be
made on the same tcp connection.
> But are there corresponding options in the nginx stream module to achieve
> the same?
In general - no. You usually don't care about "stream", you care about
the specific protocol that you are using on top of the tcp-or-other
connection. And in general, nginx does not know the details of *that*
protocol.
In specific cases - maybe. What is the use case that you care about here?
> How nginx persist tcp connection with downstream?
It's a tcp connection. From ip:port to ip:port at time, and subsequent
packets refer to previous ones. The tcp connection stays active until
it gets closed - Reset or Fin, usually.
> How nginx persist tcp connection with upstream?
Same answer, unless you have a specific use-case that wants further
explanation, I think.
> What is the "session" meaning in the stream context?
Where do you see that term?
Possibly the context there, will provide the description?
I see http://nginx.org/en/docs/njs/reference.html#stream and
http://nginx.org/en/docs/stream/ngx_stream_upstream_module.html#var_upstream_session_time
and some mentions in
http://nginx.org/en/docs/stream/ngx_stream_proxy_module.html
Generally, they seem to refer to "what you would expect they refer to".
All of the exact what-nginx-does "documentation" is in the src/stream/
directory.
The more general "summary" docs are at the website links above.
If you can point at a piece of documentation that should describe what
you want but does not, that will be useful information to help someone
improve the documentation.
Cheers,
f
--
Francis Daly francis@daoine.org
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