<S.A.V.I.O.U.R /> simillustra

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers


	// Adding current user to www-data
	sudo adduser $USER www-data

	//change ownership to user:www-data and
	sudo chown $USER:www-data -R /var/www/html
	sudo chmod u=rwX,g=srX,o=rX -R /var/www/html

	// change file permissions of existing files and folders to 755/644
	sudo find /var/www/html -type d -exec chmod g=rwxs "{}" \;

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD