Nginx

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What is nginx

nginx (pronounced "engin-x") is a Web and reverse proxy server for HTTP, SMTP, POP3 and IMAP protocols. It focuses on high concurrency, performance and low memory usage. Nginx quickly delivers static content with efficient use of system resources, also dynamic content is delivered on a network using FastCGI, SCGI handlers for scripts, uWSGI application servers or Phusion Passenger module (atm broken in funtoo), further more it can serve a very capable software load balancer. It uses an asynchronos event-driven approach to handle requests which provides more predictable performance under load, in contrast to the Apache HTTP server model, that uses a threaded or process-oriented approach to handling request. Nginx is licensed under a BSD-like license and it runs on Unix, Linux, BSD variants, Mac OS X, Solaris, AIX and Microsoft Windows.

Installation

USE flags

Before you can install nginx, the following USE-flags are available, these can be set by /etc/portage/package.use or /etc/portage/package.use/nginx, depending on your setup.

Important

This section is in need of updates.

Use flag	Default	Recommended	Description
aio	?	?	Enables file AIO support.
debug	?	?	Enables extra debug codepaths, like asserts and extra output.
http	?	?	Enables http serving.
http-cache	?	?	Enables caching for http files.
ipv6	?	?	Enables IPv6 support.
libatomic	?	?	Use libatomic instead of builtin atomic operations.
pcre	?	?	Enables support for Perl Compatible Regular Expressions.
ssl	?	?	Adds support for Secure Socket Layer connections.
vim-syntax	?	?	Pulls in related vim syntax scripts.

Furthermore, you can set the nginx modules you like to use in /etc/make.conf in the NGINX_MODULES_HTTP variable as NGINX_MODULES_HTTP="variables".

USE Expanded flags

nginx USE-flags go into /etc/portage/package.use or /etc/portage/package.use/nginx, while the HTTP and MAIL modules go as NGINX_MODULES_HTTP or NGINX_MODULES_MAIL are stored in /etc/make.conf. And as you wouldn't server only static html files, but most commonly also php files/scripts you should also install php with fpm enabled and xcache for caching the content, what makes your nginx setup way faster. For xcache you need to set PHP_TARGETS="php5-3" in '/etc/make.conf'.

Example:

root # echo "www-servers/nginx USE-FLAG-List" >> /etc/portage/package.use/nginx

Emerging nginx

Now you are ready to install nginx with php and xcache support:

root # emerge -avt nginx php xcache

so now just check your useflags and press enter to start emerge.

Configuring

All configuration is done in /etc/nginx with nginx.conf as the main configuration file and all virtual hosts in /etc/nginx/sites/available while you have to symlink /etc/nginx/sites-available/{VHOST} to /etc/nginx/sites-enabled/{VHOST} to activate them. An example config for such a {VHOST} looks like that:

server {
    listen          80;
    server_name     www.example.com;

    access_log      /var/log/nginx/www.example.com.access_log main;
    error_log       /var/log/nginx/www.example.com.error_log info;

    root /var/www/www.example.com/htdocs;
}

The nginx.conf and sites-available/localhost file is well commented. Customize it to your needs. Make sure you set the listen option correctly. By default, the listen option is set to listen on the loopback interface. If you leave this unchanged other computers on the network will not be able to connect to the server.

Location Processing Order

One often confusing aspect of nginx configuration is the order in which it processes location directives. This section is intended to clarify the confusion and help you to write secure nginx location directives.

Two basic types of Location directives

There are two basic types of location directives. The first is called a "conventional string", and looks something like this:

location /foo { deny all; }

The second basic type of location directive is a regex, or regular expression block. In its most basic form, it looks like this, with a "~" and then a regular expression that is matched against the request path. "^" can be used to match the beginning of the request path, and "$" can be used to match the end of the request path. If you need to match a ".", you must escape it as "\." as per regular expression matching rules:

location ~ \.php$ { blah; }

The basic algorithm

Nginx uses a special algorithm to find the proper location string to match the incoming request. The basic concept to remember is that conventional string directives are placed in one "bucket", and then regular expression strings are placed in another "bucket". Nginx will use the first regular expression match that it finds, when scanning the file from top to bottom. If no matching regular expression is found, nginx will look in its "conventional string" bucket, and try to find a match. In the case of the conventional string matches, the most specific match will be used, in other words, the one will be used that matches the greatest number of characters in the request path.

This is the foundation for nginx location processing, so always use these rules as a starting point for understanding location matching order. Nginx then provides various sub-types of location directives which modify this default behavior in a number of ways. This will be covered in the next section.

Advanced Location Processing

Always use the location processing logic described in the previous section as the foundation for understanding how nginx finds a matching location directive, and then once you are comfortable with how this works, read about these more advanced directives and understand how they fit into nginx's overall logic.

= (equals) Location

One advanced location directive is the "=" location, which can be considered a variant of a "conventional string" directive. "=" directives are searched before all other directives, and if a match found, then the corresponding location block is used. A "=" location must the requested path exactly and completely. For example, the following location block will match only the request /foo/bar, but not /foo/bar/oni.html:

location = /foo/bar { deny all; }

~* (case-insensitive regex) Location

A "~*" regex match is just like a regular "~" regex match, except matches will be performed in a case-insensitive manner. "~*" location directives, being regex directives, fall into the regex "bucket" and are processed along other regex directives. This means that they are processed in the order they appear in your configuration file and the first match will be used -- assuming no "=" directives match.

^~ (short-circuit conventional string) Location

You may think that a "^~" location is a regex location, but it is not. It is a variant of a conventional string location. If you recall, nginx will search for conventional string matches by finding the most specific match. However, when you use a "^~" location, nginx behavior is modified. Imagine the way a conventional string match works. Nginx scans your configuration file, looking at each conventional string match from line 1 to the end of file, but it scans all conventional string matches to find the best match. Well, the "~^" location match short-circuits this process. If, in the process of scanning each conventional string match in the config file, nginx encounters a "^~" match that matches the current request path, then nginx will apply this match, and stop looking for the best match.

Ebuild Update Protocol

To work on a new version of the ebuild, perform the following steps.

First, temporarily set the following settings in /etc/make.conf:

NGINX_MODULES_HTTP="*"
NGINX_MODULES_MAIL="*"

This will enable all available modules for nginx.

Now, create a new version of the ebuild in your overlay, and look at all the modules listed at the top of the ebuild. Visit the URLs in the comments above each one and ensure that the latest versions of each are included. Now run ebuild nginx-x.y.ebuild clean install to ensure that all modules patch/build properly. Basic build testing is now complete.

Package:Nginx