du -a /directory | sort -n -r | head -n 5

*Replace directory with e.g. / to search the entire disk. Or /root for root only etc.

Update the following values in /etc/php.ini:

upload_max_filesize = 20M
post_max_size = 20M

Restart php-fpm

service php-fpm restart

Add the following to the nginx http block:

client_max_body_size 20m;

Restart nginx

service nginx restart

Set the perfect permissions for WordPress:

cd /path/to/wp/webroot; find . -type d -print0|xargs -0 chmod 755; find . -type f -print0|xargs -0 chmod 644; chown nginx:nginx * -R

*Update nginx:nginx to your web daemon user and group

Recently had an issue where I was unable to upload media within WordPress. Turned out the user and group in php-fpm’s www.conf was incorrect. To fix:

vim /etc/php-fpm.d/www.conf

user: nginx
group: nginx

Restart php-fpm

service php-fpm restart

tcpdump udp portrange 1000-5000 -w capture.pcap

The above can be opened with wireshark for inspection.