Re: Realserver failover problem using ssl and tomcat

To: Jason Downing <jasondowning@xxxxxxxxxxxxxxxx>
Subject: Re: Realserver failover problem using ssl and tomcat
Cc: lvs-users <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
From: Horms <horms@xxxxxxxxxxxx>
Date: Wed, 28 Jun 2006 15:52:09 +0900
On Wed, Jun 28, 2006 at 04:41:29PM +1000, Jason Downing wrote:
> I'm talking about existing connections. I'm pretty sure new connections are 
> absolutely fine, but I will test this to make sure, thanks for reminding 
> me. I am not using persistence (although I have tried it and results were 
> the same).

Ok, if it is existing connections that are the problem, then this is
an expectied behaviour, which can be changed using

    expire_nodest_conn - BOOLEAN

        0 - disabled (default)
        not 0 - enabled

        The default value is 0, the load balancer will silently drop
        packets when its destination server is not available. It may
        be useful, when user-space monitoring program deletes the
        destination server (because of server overload or wrong
        detection) and add back the server later, and the connections
        to the server can continue.

        If this feature is enabled, the load balancer will expire the
        connection immediately when a packet arrives and its
        destination server is not available, then the client program
        will be notified that the connection is closed. This is
        equivalent to the feature some people requires to flush
        connections when its destination is not available.

> I will try a 2.6 kernel and let you know the results. It will take me a 
> while to do because my previous limited experience of changing kernels has 
> always resulted in considerable head scratching....

I'm pretty sure you will get the same result, now that I think
its related to expire_nodest_conn.

> I also have found out that there is a 60 second timeout in tomcat cluster 
> to declare a node dead. I am currently checking to see how to change this 
> to 2 seconds.

H:          W:

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