As far as I know there is no official way to flush / empty cache.

You can either:
a) purge whole cache using "rm -rf /data/nginx/proxy_cache2" (this will
somehow invalidate all cache files, because nginx won't be able to open them
anymore),
b) purge selected pages using cache_purge patch [1].

[1] http://labs.frickle.com/nginx_cache_purge

Best regards,
Piotr Sikora < piotr.sikora@frickle.com >


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