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HI,
Thank you for your suggestions. The solution:
On the linux imap servers the tcp-keepalive value in
/proc/sys/net/ipv4/tcp_keepalive_time is set to 7200
centaur# pwd
/proc/sys/net/ipv4
centaur# cat tcp_keepalive_time
7200
This must be matched by the ipvsadm tcp timeout. So the options are to:
1. use ipvsadm --set 7200 0 0 on the lvs server
or
2. echo "900" >! /proc/sys/net/ipv4/tcp_keepalive_time
Either of these work. I have not had any further problems with this since
I made the changes. Maybe this could be appended to the TCP timeout issue
in the FAQ/DOCs for IMAP for future reference.
Thanks again for you help,
Ramon Kagan
York University, Computing and Network Services
Unix Team - Intermediate System Administrator
(416)736-2100 #20263
rkagan@xxxxxxxx
-------------------------------------
I have not failed. I have just
found 10,000 ways that don't work.
- Thomas Edison
-------------------------------------
On Wed, 20 Nov 2002, Joseph Mack wrote:
> Ramon Kagan wrote:
>
> > > is this after 8hrs, 24hrs, or something else?
> > >
> > actually just about anything, as low as ten minutes, and those are the
> > ones I really worry about
>
> maybe it's the LVS timeout. There is also a tcp keepalive timeout somewhere
> too
> which is separate from the LVS timeout.
>
> > The tcp connections go through the normal cycle, EST, WAIT, FIN_WAIT...
>
> does the client disconnect between fetches or is the connection open all the
> time?
>
> does the client maintain a (possibly separate)
> connection to the demon to keep authentication valid?
>
> > However the imap daemon is kept alive, and the client is shipped the PID
> > of the imapd to reconnect directly.
>
> didn't know you could connect to a process number on a remote machine ;=\
>
> 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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