memcached timeouts

[Miguel DeAvila]

On Monday 05 May 2008 12:05:26 Evert | Rooftop wrote:
> I'm getting timeouts trying to connect to memcached. The odd thing is  
> that the timeouts only occur from 1 single webserver, to 1 single  
> memcached box:
> 
> Memcache::get() [<a href='function.Memcache-get'>function.Memcache- 
> get</a>]: Server www5 (tcp 11211) failed with: Connection timed out  
> (110)
> 
> Other boxes connecting to that memcached instance work fine, and that  
> webserver connecting to other memcached instances also have no issues.
> 
> This might well be a problem somewhere completely else, but I was  
> hoping someone on this list can advice on how to track down the exact  
> problem. What is a good starting point?

- ping from the affected web server to the affected memcache server
- nc from the affected web server to the affected memcache server
- compare output of /sbin/route on affected web server with normally-functioning web server