Attempt at getting varnish to work with multiple sites (WordPress and Rails) on a single server.

etc_default_varnish

# Configuration file for varnish
#
# /etc/init.d/varnish expects the variables $DAEMON_OPTS, $NFILES and $MEMLOCK
# to be set from this shell script fragment.
#
# Note: If systemd is installed, this file is obsolete and ignored.  You will
# need to copy /lib/systemd/system/varnish.service to /etc/systemd/system/ and
# edit that file.

# Should we start varnishd at boot?  Set to "no" to disable.
START=yes

# Maximum number of open files (for ulimit -n)
NFILES=131072

# Maximum locked memory size (for ulimit -l)
# Used for locking the shared memory log in memory.  If you increase log size,
# you need to increase this number as well
MEMLOCK=82000

DAEMON_OPTS="-a :80 \
             -T localhost:6082 \
             -f /etc/varnish/default.vcl \
             -S /etc/varnish/secret \
             -s malloc,64m"

etc_varnish_default.acl

# This is a basic VCL configuration file for varnish.  See the vcl(7)
# man page for details on VCL syntax and semantics.
#
# Default backend definition.  Set this to point to your content
# server.
#
backend default {
    .host = "joostschuur.com";
    .port = "8080";
}

sub vcl_recv {
        # Skip Rails sites
        if (req.http.host ~ "hellorails.joostschuur.com" ) {
                return (pass);
        }
        # Drop any cookies sent to Wordpress.
        if (!(req.url ~ "wp-(login|admin)")) {
                unset req.http.cookie;
        }
}

# Drop any cookies Wordpress tries to send back to the client.
sub vcl_fetch {
        if (!(req.url ~ "wp-(login|admin)")) {
                unset beresp.http.set-cookie;
        }
}

nginx.conf

user  www-data;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

pid		logs/nginx.pid;


events {
	worker_connections  1024;
}


http {
	passenger_root /usr/local/rvm/gems/ruby-1.9.3-p392/gems/passenger-3.0.19;
	passenger_ruby /usr/local/rvm/wrappers/ruby-1.9.3-p392/ruby;

	include			mime.types;
	default_type	application/octet-stream;

	sendfile		on;
	#tcp_nopush		on;

	#keepalive_timeout  0;
	keepalive_timeout  65;

	#gzip			on;

	server_names_hash_bucket_size 64;

	server {
		server_name hellorails.joostschuur.com;
		listen 80;

		root /www/hellorails.joostschuur.com/public;

		passenger_enabled on;
	}

  server {
		server_name www.joostschuur.com joostschuur.com;
		listen		127.0.0.1:8080;

		root /www/joostschuur.com/htdocs;
		index index.php index.html index.htm;

		access_log logs/joostschuur-access.log;
		error_log logs/joostschuur-error.log;

		location / {
				try_files $uri $uri/ /index.php?q=$uri&$args;
		}

		error_page 404 /404.html;

		error_page 500 502 503 504 /50x.html;
		location = /50x.html {
			  root /opt/nginx/html;
		}

  	location ~ \.php$ {
			fastcgi_pass unix:/var/run/php5-fpm.sock;
			fastcgi_index index.php;
			fastcgi_param SCRIPT_FILENAME  $document_root$fastcgi_sc
ript_name;

			include fastcgi_params;
		}
	}
}