If one site gets compromised, the others are also in risk. However, this risk may be overcome in php-fpm by creating a different pool which runs under a different user for each nginx virtual host.
nginx
No IP Canonicalization may harm Website Ranking
Be careful, your server IP is not forwarding to your website’s domain name. Search engines like Google are now able to index your website with its IP instead of its domain name. This will result in duplicate content.
Host Multiple Sites on LEMP Server in Linode
How to host multiple websites in a Linode on Debian linux distribution, Nginx as web server, MySQL as database, PHP5-FPM as language processing from Windows PC.
Increase File Upload Limit in NGINX and PHP5-FPM
To increase file upload limit you need to change two php5 settings i.e. upload_max_filesize and post_max_size. In Nginx you need to add client_max_body_size directives.
Implement Sphinxsearch in phpBB
Sphinxsearch is believed to be the fastest search engine. It is very much useful for large websites. Sphinxsearch can only be installed in a Nginx server.
WordPress Category and Tag Base in Nginx
If you like to change category or tag in wordpress in Nginx server, you need to use rewrite rules in your /etc/nginx/sites-available/example.com.