Sync the cache of multiple nginx servers

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http://serverfault.com – I have a master caching server with nginx. Its setup with proxy_pass and proxy_cache. But I want to add more nginx caching servers in other locations that will all contain the same contents with master cache server. So it wouldnt matter to which server I send the request. Is it possible to just rsync the cache directory across all the servers? (HowTos)