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You have answered my question : we can't remove manually established connection
entries from the tables even if for whatever reason there are not valid anymore.
We can only wait they timeout.
If I dynamically change the timeout value, will this value be also applied to
existing established connections or only new connections will see this new
timeout ? (I have no hand on a LVS box right now to perform some tests....)
Laurent
Joseph Mack a écrit :
>
> Laurent Lefoll wrote:
> >
> > Hi all,
> >
> > Is there a way to clear some entries in the ipvs tables ?
> > I will try to precise my needs. We have a linux box (2.2.18, LVS 1.0.5 )
> > load-balancing SMTP to 2 real servers with LVS-NAT and lc balancing
> > algorithm.
> > Everything is working fine but if server n°1 reboots or crashes, the
> > connections
> > entries remains in the tables as nothing indicated to the LVS box that the
> > connections are no more active. So when the real server n°1 comes back to
> > operation, the lvs box keeps on sending all the requests (up to a certain
> > value)
> > to server n°2 because from the connection tables, it seems there are
> > established
> ^^^
> do you mean n*1 here?
>
> > connection to server n°1 and we are in lc balancing.
>
> Let's make sure we are talking about the same thing and then maybe
> you can ask again.
>
> After a real-server failure, some agent external to LVS
> will run ipvsadm to delete the entry(entries) for that
> real-server. Once this is done no new connections can
> be made to that server, but the entries are kept in
> the table till they timeout. You can't 'remove' those
> entries, you can only change the timeout values.
>
> Any clients connected through
> those entries to the failed service(s) will find their
> connection hung or deranged in some way. We can't do
> anything about that. The client will have to
> disconnect and make a new connection.
> For http where the client makes
> a new connection almost every page fetch, this is not
> a problem. Someone connected to a database may find their
> screen has frozen.
>
> Joe
> --
> Joseph Mack PhD, Senior Systems Engineer, Lockheed Martin
> contractor to the National Environmental Supercomputer Center,
> mailto:mack.joseph@xxxxxxx ph# 919-541-0007, RTP, NC, USA
>
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