Spock memcached error cannot set 66042 file descriptors

Getting a warning from memcached on start-up about the lack of FDs:

WARNING Failed to set the number of file descriptors to 66042 due to system resource restrictions. This may cause the system to misbehave once you reach a  high connection count as the system won't be able open new files on the system. The maximum number of file descriptors is currently set to 40960. The system is configured to allow 65000 number of client connections, and in addition to that the overhead of the worker threads is 18. Finally the backed database needs to open files to persist data.

grep ulimit /etc/init.d/couchbase-server
ulimit -n 40960
ulimit -l unlimited

If there's a new upper bound of FDs required by spock it needs a new ulimit set as well.