nginx – avoid 501 and 502 nginx errors

This are my settings on /etc/php5/fpm/pool.d/www.conf to avoid 501 and 502 nginx errors… on CentOS 7 location of www.conf is at /etc/php-fpm.d/.
The server has 16Gb RAM. This configuration is for a 8Gb RAM server so…

pm.max_children = 70
pm.start_servers = 20
pm.min_spare_servers = 20
pm.max_spare_servers = 35
pm.max_requests = 500

Sources & more readings
http://myshell.co.uk/blog/2012/07/adjusting-child-processes-for-php-fpm-nginx/
http://jeremymarc.github.io/2013/04/22/nginx-and-php-fpm-for-performance/

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