fix: set worker_rlimit_nofile to (worker_connections x 2) #2387
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This is an attempted fix for #1780 by setting worker_rlimit_nofile value to two times the value we use for worker_connections (10240 x 2 = 20480). This is what is recommended by nginx as a minimum and it appeared to fix #1780 for @danifr
The hard to decipher regex is used to insert
worker_rlimit_nofile 20480;
to/etc/nginx/nginx.conf
only once, after the first occurence of the character}
.