How to Fix client intended to send too large body

First you need to edit the /etc/nginx/nginx.conf file by typing the vi command:

$ sudo vi /etc/nginx/nginx.conf

In http (server/location) section add the following directive to set the

maximum allowed size in 10MB:

client_max_body_size 10M;

Save and close the file.

Test nginx configuration for error

Run the following command:

$ sudo nginx -t

Sample outputs:

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

If no error means, restart the nginx web server.

$ sudo systemctl reload nginx

OR

$ sudo service nginx reload

Verify configuration by uploading a large file. Make sure you watch nginx error log too:

$ sudo tail -f /var/log/nginx/error.log

How to configure php to accept upload upto 10MB

Edit your php.ini file and make sure the following two line present in it:

$ sudo vi /etc/php.ini

Append or edit as follows:

upload_max_filesize=10M
post_max_size=10M

Save and close the file. Restart your Nginx PHP-fpm service:

$ sudo systemctl start php-fpm

OR

$ sudo /etc/init.d/php-fpm restart

OR

# /usr/local/etc/rc.d/php-fpm restart

Now upload a file and test it.

Summary:

In short you need the following line in nginx.conf and php.ini using the grep command/egrep command/tail command:

$ grep client_max_body_size /etc/nginx/options.conf
$ egrep 'upload_max_filesize|post_max_size' /etc/php/7.0/fpm/conf.d/99-custom.ini
$ tail -f /var/log/nginx/error.log
$ tail -f /var/log/nginx/php-fpm-error.log