nginx cache - could not allocate node in cache keys zone

CJ Ess zxcvbn4038 at
Thu Mar 10 19:06:21 UTC 2016

Same condition on two more of the servers in the same pool. Reload doesn't
resolve the issue, but restart does. No limit being hit on disk space,
inodes, open files, or memory.

On Thu, Mar 10, 2016 at 12:12 PM, CJ Ess <zxcvbn4038 at> wrote:

> I have four servers in a pool running nginx with proxy_cache. One of the
> nodes started spewing "could not allocate node in cache keys zone" errors
> for every request (which gave 500 status). I did a restart and it started
> working again.
> What conditions cause that error in general?
> If it happens again is there anything I can do to try and determine the
> root cause?
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