Nginx reverse proxy cache for multiple sites

mkdir sites-available sites-enabled include.d conf.d

# The user to run Nginx as, often www, www-data or nginx
# It is safest to leave the previous setting as it is
user www-data;

# Decent starting point for this is the number of cores/threads on the machine
# cat /proc/cpuinfo | grep ^processor | wc -l
worker_processes 4;

# Pid file location, the default value will often be just fine
pid /var/run/nginx.pid;


events {
	# 1024 is a decent starting point
	# You can increase it further, but you should check "ulimit -n" before
	# adjusting higher
	worker_connections 1024;

	# If you find that this gives you extra performance feel free to uncomment
	# I however didn't find it to have any effect at all
	# multi_accept on;
}

http {

	#
	# Basic optimizations
	#

	sendfile on;
	tcp_nodelay on;

	# This might be better set to on for some, off for some
	# for me however, I saw no difference between having it enabled or disabled
	tcp_nopush on;

	# How long to wait for new request from the same connection
	keepalive_timeout 180;

	# Don't advertise every detail of the server to all requests (security)
	server_tokens off;

	# Uncomment if you for some reason have a very long domain name
	# server_names_hash_bucket_size 64;

	# File type detection and default
	include /etc/nginx/mime.types;
	default_type application/octet-stream;


	#
	# Logging Settings
	#

	# Access logging is a bit of useless, don't 
	# enable it unless you really need to
	# access_log /var/log/nginx/access.log;

	# Error logging however is useful, make sure the destination folder exists
	error_log /var/log/nginx/error.log;


	#
	# Gzip Settings
	#
	# Gzipping content will increase performance from client's point of view
	#

	# Enable Gzip compression
	gzip on;

	# But disable it for clients that don't support it
	gzip_disable "msie6";
	gzip_disable "Wget";

	# Make sure any third-party proxies cache things properly
	gzip_vary on;

	# Compress regardless of caching headers
	gzip_proxied any;

	# Compress as much as possible
	gzip_comp_level 9;

	# You might want to change this to 1.0 if you find Gzip gives you more
	# than keepalive, as keepalive won't work with 1.0 and Gzip
	# gzip_http_version 1.0;

	# File types to Gzip compress, it works best for plain text files
	gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;


	#
	# Caching
	#

	# Enables proxy cache to /var/cache/nginx/xx/xx/xx/*
	# ... calls the cache "STATIC"
	# ... delete files from cache completely if not requested within 24h
	# ... and allow a maximum of 1GB of disk space to be consumed for it
	#
	# Make sure the directory /var/cache/nginx exists and
	# is writable by the Nginx user, or change the path
	#
	proxy_cache_path /var/cache/nginx levels=2:2:2 keys_zone=STATIC:1000m inactive=24h max_size=1g;

	# Include all additional configuration files (please do check their contents)
	include /etc/nginx/conf.d/*.conf;

	# Include all configs for enabled sites
	include /etc/nginx/sites-enabled/*;
}

# Defines if reverse-proxying should use HTTP 1.0 or 1.1
# You should try which gives you better results, 
# or if you find any significant differences at all
proxy_http_version		1.0;

# Pass through the original Host the request was made for
proxy_set_header		Host $host;

# Allow destination server to know where the proxied requests came from
proxy_set_header		X-Real-IP $remote_addr;
proxy_set_header		X-Forwarded-For $proxy_add_x_forwarded_for;

# Clear a few headers we might not want to pass on
# If you do not know what these do, it's safe to leave them as is
# If you do, you should know if you want to clear them or not
proxy_set_header		Accept "";
proxy_set_header		Connection "";

# Enable caching for the proxied requests using the STATIC storage
proxy_cache				STATIC;

# Cache 200 (OK), as well as 301 and 302 (redirect) responses for 4h
proxy_cache_valid		200 301 302 4h;

# Cache 404 (Not found) responses for only 10m, just in case of human errors
proxy_cache_valid		404 10m;

# Allow using stale data (cached data that has expired) in the following cases:
# - an error has occurred while connecting to the server, sending a request to it, or reading its response
# - timeout occurred during the connection with the server, transfer the request or while reading response from the server
# - server returned a empty or incorrect answer
# - server returned an error status (500, 502-504)
proxy_cache_use_stale	error timeout invalid_header updating http_500 http_502 http_503 http_504;

#
# Please be sure to understand that this configuration doesn't care much about
# what kind of headers the server sends about if the content should be cached
# or not, it just does it's thing.
#
# For more information, see: http://wiki.nginx.org/HttpProxyModule#proxy_no_cache
#

# Reverse proxy http://example.com/ to 127.0.0.1:8080
server {
	listen 80;

	# The domain name(s) to respond to
	server_name example.com;

	# All requests should be handled like this:
	location / {
		# Reverse proxy to 127.0.0.1:8080
		# (change accordingly to your configuration)
		proxy_pass http://127.0.0.1:8080;

		# Append common proxy configuration
		include include.d/proxy.conf;
	}

}

# Permanently redirect *://*.example.com/* to *://example.com/*
#
# It might be that you don't want this, but I see
# it as vital search engine optimization
server {
	listen 80;
	server_name *.example.com;
	return 301 $scheme://example.com$request_uri;
}

ln -s /etc/nginx/sites-available/domain.com /etc/nginx/sites-enabled