varnish 2.0.4 backend errors
lazy404 at gmail.com
Tue Jul 14 02:16:41 CEST 2009
2009/7/14 Ken Brownfield <kb at slide.com>:
> The progression from your dump is:
> Varnish Apache
> ...4.4 seconds later...
> FIN+ACK (???)
right i missed the 4second gap, so varnish may be hitting a timeout
> It looks like the ACK from the Varnish side is getting lost on its way to
> Apache, and Apache retransmits. This itself would imply that you have some
> packet loss between Varnish and Apache. That 4.4 second delay could easily
> be running you against the sess_timeout (or cli_timeout, maybe). Bumping
> those up to 10 might clear the issue for you.
> Obviously, packet loss will cause issues in general, so I'd investigate that
it's a local interface, not lo but the traffic is going threw loopback interface
> More bizarrely, that FIN+ACK is missing a FIN from Apache. Are you sure
> this stream is correct? I have no idea what would cause a spurious FIN+ACK
> (besides a spurious FIN) and the issue would be highly unlikely a Varnish
> issue; more likely a kernel TCP stack issue.
> Is there anything between Varnish and Apache in your config, besides two
> machines on a shared switch? Proxies? Firewall rules? Switch ACLs? What
> OSes/versions are you running on each side?
it's only 1 machine
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