How can I flush the connection table?

[Joseph Mack NA3T]

On Tue, 13 Jun 2006, Hildebrand, Nils, 122 wrote:

> After some clients connected through lvs to Webserver #2 
> the Webserver #2 went down. Some seconds later lvs-kiss 
> realized the servers was down and set the weight for that 
> server to zero.
>
> BUT: Clients were still trying to connect to Webserver #2.
>
> After I looked at "ipvsadm -Lc" I found that their old connection was still
> there and the timeout-value for Webserver#2 got reset to one hour againg
> after every try.
>
> I would have expected that all Webserver #2-connections will get invalidated
> and that the client-retry would then go to Webserver #1.
>
> What's wrong here?

you don't understand the contract you've made with the 
director by using persistence. By setting the weight to zero 
you told the director not to establish new connections to 
that realserver. The current connections will still be 
forwarded and will continue till an hour after their last 
connection. There not being easy ways of moving 
sessions/keys, you aren't allowed to have a realserver fail 
when you have a session. If you're using persistence to 
enforce your session, you have to shut down your realserver 
pre-emptively for service and guarantee it stays up when you 
put it back on line.

The alternate method is to have the session information 
global (eg in a database accessible to all realservers, or 
cookies at the client end). This requires rewriting your 
application.

If you really want to tear out the client's session, the 
HOWTO tells you HOW.

Joe

-- 
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
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