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Hi everybody,
thanks to everybody who helped writing LVS.
Unfortunately I have the same problem as Andres (see below)
If I remove a real server from a list of persistent
virtual servers, this connection never times out. Not even
after the specified timeout has been reached. Only if I unset
persisency the connection will be redirected onto the remaining
real servers. Now if I turn on persistency again, a prevoiusly
attached client does not reconnect anymore - it seems as
if LVS remembers such clients. It does not even help, if I delete
the whole virtual service and restore it immediately, in the
hope to clear the persistency tables.
(ipvsadm -D -t <VIP>; ipvsadm -A -t <VIP> -p; ipvsadm -a -t <VIP> -R <alive
real server>)
And it also does not help closing the browser and restarting it.
I run LVS in masquerading mode on a 2.2.13-kernel patched
with ipvs-0.9.5.
Would'nt it be a nice feature to flush the persistent client
connection table, and/or list all such connections?
Regards, Jacob
Andres Reiner wrote:
(...snip...)
>> Now I found some strange behaviour using 'mon' for the
>> high-availability. If a server goes down it is correctly removed from
>> the routing table. BUT if a client did a request prior to the server's
>> failure, it will still be directed to the failed server afterwards. I
>> guess this got something to do with the persistent connection setting
>> (which is used for the cold fusion applications/session variables).
>>
>> In my understanding the LVS should, if a routing entry is deleted, no
>> longer direct clients to the failed server even if the persistent
>> connection setting is used.
>>
>> Is there some option I missed or is it a bug ?
Wensong Zhang wrote:
> No, you didn't miss anything and it is not a bug either. :)
>
> In the current design of LVS, the connection won't be drastically
> removed but silently drop the packet once the destination of the
> connection is down, because monitering software may marks the server
> temporary down when the server is too busy or the monitering software
> makes some errors. When the server is up, then the connection continues.
> If server is not up for a while, then the client will timeout. One thing
> is gauranteed that no new connections will be assigned to a server when
> it is down. When the client reestablishs the connection (e.g. press
> reload/refresh in the browser), a new server will be assigned.
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