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Ramon Kagan wrote:
>
> HI,
>
> Linux 2.4.18
> IPVS 1.0.4
>
> Previously we had been using DNS shuffle records to spread the load of
> IMAP connections across 3 machines. Having used LVS for web traffic for a
> long time now (about 2.5 yeras) we decided to bring our IMAP service into
> the pool. The imap servers have been setup to retain idle connections for
> 24 hours (not my choice but the current setup anyways). The lvs servers have
> been setup to have a persistance of 8 hours. What has been happening
> lately is that users get the following type error.
is "lately"
o after you moved IMAP to LVS
o something else
> "The server has disconnected, may have gone down or may be a network
> problem, try connecting again"
is this after 8hrs, 24hrs, or something else?
> So, users don't have to reauthenticate per se, they just need to reclick
> on whatever button, so that the client they are using reauthenticates
> them.
>
> Anybody have ideas on what is happening, this didn't occur prior to going
> to LVS.
I don't know how IMAP works -
does it keep a tcp connection open all the time or is each fetch a new
connection?
How is the state of authentication maintained between fetches?
there is a tcp timeout associated with tcp connections through LVS which
affects telnet, ssh sessions.
http://www.linuxvirtualserver.org/Joseph.Mack/HOWTO/LVS-HOWTO.services.html#timeout
Joe
--
Joseph Mack PhD, Senior Systems Engineer, SAIC contractor
to the National Environmental Supercomputer Center,
mailto:mack.joseph@xxxxxxx ph# 919-541-0007, RTP, NC, USA
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