While doing some upgrading and maintenance work on one of my Digital Ocean droplets. I noticed that there is some 'defunct' process running around since last year. So without thinking much, I decided to kill -9 the process... and guess what... the next thing is that my Nginx web server starting to show 502 Bad gateway error.
Apparently, the process that I've killed earlier is not defunct but it is the important fpm-php service.
To restart the fpm-php... use one of these commands
/etc/init.d/php-fpm restart
or
service php-fpm restart
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