Ubuntu+Nginx packet loss / dropped upstream connections

[Maxim Dounin]

Hello!

On Thu, May 22, 2014 at 03:05:22PM -0400, slowredbike wrote:

> Did you ever get a response to this...We are seeing the following:
> 
> no live upstreams while connecting to upstream....
> 
> we know the upstream servers are not crashing but are trying to determine
> how/why they are being deemed as down.  The nginx gives no information on
> this and the servers show no errors either.

All servers in the upstream block are considered down due to 
errors encountered while working with the servers previously.  
Relevant information about errors should be in logs.

See max_fails/fail_timeout parameters of the server directive in 
the documentation for details:
 
http://nginx.org/en/docs/http/ngx_http_upstream_module.html#server

-- 
Maxim Dounin
http://nginx.org/