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Horms wrote:
On Thu, Nov 09, 2006 at 04:50:35PM -0500, Mark Swanson wrote:
Hello,
I have a question regarding persistent connections.
When I take a machine offline via:
/sbin/ipvsadm -d -t machineA:http -r machineB:http
Everything works mostly fine. If I click 'reload' on a browser window that had
previously connected to machineB it hangs, but clicking 'reload' again connects
to a different machine in the cluster and all is well.
However, after I'm done doing maintenance on machineB and I bring it back
online via:
/sbin/ipvsadm -a -t machineA:http -r machineB:http -m -w 1
Then the machine instantly has 65 ActiveConn, 138 InActConn. It's as if the
persistent connection information wasn't removed when I did ipvsadm -d
previously.
If I wanted the persistent connection information to be cleared for a
particular machine that I've deleted, is there a way to do that?
Setting /proc/sys/net/ipv4/vs/expire_quiescent_template to a non-zero
value might help, though I'm surprised that you see the behaviour that
you describe. Are you sure that it is related tp presistence? How long
Well, I was just guessing...
are you taking the real-server offline for? Perhaps it is just finding
It was for less than a minute, but I don't remember exactly - I will
carefully note the time in the future.
the old connections in the trash, in which case its probably not
I suspect you are right.
I've since noticed that deleting a real server doesn't
disconnect/re-route established connections (which is fine, and
preferred). My process is to let all established connections finish, so
whatever I was noticing before would not have been established
connections (trash?).
something to worry about. Inspecting ipvsadm -L -c -n should throw some
light on it - for each connection entry, if the source port for the
source host is 0, then its related to persistance, otherwise its not.
Thanks for the tip - I will try that out, and have added that to my
personal notes.
Thanks for responding.
Cheers.
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