How to prevent running out of connections?
rtibmx at yahoo.com
Mon May 26 17:48:14 MSD 2008
[Hello - I sent this last week but did not receive any responses so I am resending it in hopes of getting some information. Thank you!]
How do I make sure we don't run out of available connections for our nginx 6 box?
For instance when I run stub_status I see that I have x active connections. I can also see how the keepalive setting in nginx impacts this number.
It seems that under heavy load where connections are coming in at a much faster rate than the keepalive timeout is expiring, that things could get to a point where the number of active connections becomes too great and then there would not be enough connections available for new users.
A few questions please:
1) Is such a situation that I described above possible?
2) In such a situation, would nginx automatically free the idle keepalive connections so that it could have more connections available for use?
3) What nginx and/or Linux settings (I am using Fedora core 8 if that matters) controls what the maximum number of connections is that my box can have active? How can this be bumped up?
Obviously under some heavy load a box will reach a physical maximum that it is capable of serving. That is ok and why we have other boxes available. However I want to understand how this works so that I can keep an eye on the connections and say "Hey that's getting awfully close to our limit - time to get another box up!". Right now I have no idea how to predict what that limit is. Thanks!
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