could not build the referers_hash

Cliff Wells cliff at
Fri Mar 30 15:17:22 UTC 2012

On Thu, 2012-03-29 at 19:04 -0700, Justin Dorfman wrote:
> Hey Cliff,
> I did, same issue.  The way we ended up "fixing" it was deleting all
> of the vhosts and syncing them from another PoP.

How large did you make the value?  With a large number of vhosts the
value might need to be significantly higher.  Also, I'm not sure of the
context for this value, it might need to be at the http level.  

There's also a related value, referers_hash_bucket_size that might need
to be increased.

The only information I found was from this thread (translated from
Russian via google):

2011/7/19 Igor Sysoev <igor at xxxxxxxxx>:
> Changes in nginx 1.0.5 19.07.2011
> *) Feature: the referer_hash_max_size and
> Referer_hash_bucket_size.
> Thank you Witold Filipczyk.

With these guidelines, there are some problems:
- In the error messages as they are called, and referers_hash_max_size
- The default value for referer_hash_max_size in the error message
described as a 128 (actually - 2048)
- It is not clear how to find exactly where the problem
that is, such as the diagnosis is
nginx: [emerg] could not build the referers_hash, you should increase
referers_hash_bucket_size: 64
But that's not enough, as the context for referer_hash_max_size server
and location


More information about the nginx mailing list