/etc/default/nginx is in nginx-common 1.4.6-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # Note: You may want to look at the following page before setting the ULIMIT.
# http://wiki.nginx.org/CoreModule#worker_rlimit_nofile
# Set the ulimit variable if you need defaults to change.
# Example: ULIMIT="-n 4096"
#ULIMIT="-n 4096"
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