Description

Installs the OpenResty NGINX bundle (http://www.openresty.org) from source and
sets up configuration handling similar to Debian's Apache2 scripts. It also
provides an OHAI plugin for configuration detection and an LWRP for easy site
activation and deactivation.

Requirements

Cookbooks

The following cookbooks are direct dependencies because they're used
for common "default" functionality.

• build-essential
• ohai (for openresty::ohai_plugin)
• logrotate (for log file rotation)

Platform

The following platforms are supported and tested under test kitchen:

• Ubuntu 12.04
• CentOS 6.3

Other Debian and RHEL family distributions are assumed to work.

Chef Server

The cookbook converges best on Chef installations >= 10.16.2

Awesome stuff

This cookbook includes automatic activation of some nice NGINX features such as:

• By default LUAJIT-enabled build: The cookbook by default activates the LUAJIT
  feature of OpenResty (since this is the main reason to use the bundle) and
  accounts for all the peculiarities this option may bring.

• Automatic CPU affinity: Automatically sets the worker-to-core affinity for all
  of the NGINX worker processes. For a scenario of 8 workers and 8 cores, the
  following directive gets generated:

  worker_cpu_affinity 00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000000;
  

This feature can offer a nice performance boost, since it helps the CPUs maintain
cache locality (especially when used in conjunction to the LUA module)

• Automatic detection and activation of the AIO feature: The cookbook automatically
  detects support (Linux kernel >= 2.6.22) and enables the aio directive of NGINX.

• Automatic IPv6 detection and activation: The cookbook automatically detects and
  activates IPv6 support on NGINX.

• Rate limit proper HTTP response: The cookbook contains a small patch that enables
  NGINX to respond to over-quota requests of the limit_req module with a 429 HTTP
  response that is more semantically correct than the default 503 one and aids in
  separate and log such issues more granularly. It gives away though the fact
  that you are rate limiting, so there is an option to disable this patch.

Attributes

Node attributes for this cookbook are logically separated into different files.

default.rb

Generally used attributes. Some have platform specific values. See
attributes/default.rb. "The Config" refers to "nginx.conf" the main config file.

• node['openresty']['source']['version'] - The OpenResty version to be installed from source.

• node['openresty']['source']['url'] - The URL for downloading the selected version.

• node['openresty']['source']['checksum'] - The SHA-256 checksum for the selected version.

• node['openresty']['source']['limit_code_patch'] - Enables application of a
  patch that converts over-quota request limit HTTP 503 responses to proper 429 ones.

• node['openresty']['dir'] - Location for NGINX configuration.

• node['openresty']['log_dir'] - Location for NGINX logs.

• node['openresty']['cache_dir'] - Location for NGINX cache files.

• node['openresty']['run_dir'] - Location for NGINX state and pid files.

• node['openresty']['binary'] - Location for NGINX executable.

• node['openresty']['pid'] - The exact NGINX pid filename.

• node['openresty']['source']['conf_path'] - Exact filename for the NGINX configuration file

• node['openresty']['source']['prefix'] - Installation prefix for miscellaneous data

• node['openresty']['source']['default_configure_flags'] - A set of default configuration
  flags for the source compilation, generally best left untouched unless you
  really know what you're doing.

• node['openresty']['modules'] - An array of recipe names that are included
  from this cookbook and add additional features to the source compilation process.

• node['openresty']['extra_modules'] - An array of full recipe references (in the
  form of cookbook::recipe), for you to include extra-cookbook modules in the same
  manner as above.

• node['openresty']['configure_flags'] - An array of extra configure flags to
  be included included along the default configure flags.

• node['openresty']['user'] - User that NGINX will run as.

• node['openresty']['group] - Group for NGINX.

• node['openresty']['ipv6'] - Enables IPv6 support for NGINX. Automatically
  detected and enabled.

• node['openresty']['gzip'] - Whether to use gzip, can be "on" or "off"

• node['openresty']['gzip_http_version'] - used for config value of gzip_http_version.

• node['openresty']['gzip_comp_level'] - used for config value of gzip_comp_level.

• node['openresty']['gzip_proxied'] - used for config value of gzip_proxied.

• node['openresty']['gzip_vary'] - used for config value of gzip_vary.

• node['openresty']['gzip_buffers'] - used for config value of gzip_buffers.

• node['openresty']['gzip_types'] - used for config value of gzip_types - must be an Array.

• node['openresty']['keepalive'] - Whether to use keepalive_timeout,
  any value besides "on" will leave that option out of the config.

• node['openresty']['keepalive_timeout'] - used for config value of
  keepalive_timeout.

• node['openresty']['worker_processes'] - used for config value of
  worker_processes.

• node['openresty']['worker_connections'] - used for config value of
  events { worker_connections }

• node['openresty']['worker_rlimit_nofile'] - used for config value of
  worker_rlimit_nofile. Can replace any "ulimit -n" command. The
  value depend on your usage (cache or not) but must always be
  superior than worker_connections.

• node['openresty']['worker_auto_affinity'] - Automatically computes and creates
  CPU affinity assignments (config value worker_cpu_affinity) based on the
  total number of workers and CPU cores. Can show a nice performance boost when
  used in high request volume scenarios.

• node['openresty']['multi_accept'] - used for config value of events {
multi_accept }. Try to accept() as many connections as possible.
  Disable by default.

• node['openresty']['event'] - used for config value of events { use
}. Set the event-model. By default NGINX looks for the most
  suitable method for your OS. Automatically set to epoll for Linux >= 2.6 kernels

• node['openresty']['server_names_hash_bucket_size'] - used for config
  value of server_names_hash_bucket_size.

• node['openresty']['client_max_body_size'] - used for config
  value of client_max_body_size.

• node['openresty']['client_body_buffer_size'] - used for config
  value of client_body_buffer_size.

• node['openresty']['large_client_header_buffers'] - used for config
  value of large_client_header_buffers.

• node['openresty']['types_hash_max_size'] - used for config
  value of types_hash_max_size.

• node['openresty']['types_hash_bucket_size'] - used for config
  value of types_hash_bucket_size.

• node['openresty']['open_file_cache'] - used for config
  value of open_file_cache. Must be an array with values used in the
  open_file_cache directive of NGINX.

• node['openresty']['logrotate'] - set to true to use the logrotate_app of the
  logrotate cookbook to enable automatic log rotation of NGINX logs.

• node['openresty']['disable_access_log'] - set to true to disable the
  general access log, may be useful on high traffic sites.

• node['openresty']['default_site_enabled'] - enable the default site

realip.rb

From: http://wiki.nginx.org/HttpRealIpModule

• node['openresty']['realip']['header'] - Header to use for the RealIp
  Module; only accepts "X-Forwarded-For" or "X-Real-IP"

• node['openresty']['realip']['addresses'] - Addresses to use for the
  http_realip configuration.

fair.rb

From: http://wiki.nginx.org/HttpUpstreamFairModule

• node['openresty']['fair']['url'] - GitHub URL to checkout the fair module from

• node['openresty']['fair']['name'] - Directory name to checkout the module to

upload_progress.rb

From: http://wiki.nginx.org/HttpUploadProgressModule

• node['openresty']['upload_progress']['url'] - GitHub URL to checkout the upload_progress
  module from

• node['openresty']['upload_progress']['name'] - Directory name to checkout the
  module to

status.rb

• node['openresty']['status']['url'] - The URL that will be exposed as the NGINX status URL
• node['openresty']['status']['name'] - An array of IPs allowed to view the status URL

Recipes

default.rb

The default recipe will install the OpenResty NGINX bundle from source,
automatically including your selected set of modules, extra-cookbook modules and
set up the configuration according to the Debian site enable/disable style with
sites-enabled using the nxensite and nxdissite scripts provided by the
openresty_site LWRP.

The recipe ensures that the required packages to build NGINX are installed (pcre,
openssl, compile tools). The source will be downloaded from the
node['openresty']['source']['url']. The node['openresty']['user'] will be
created as a system user. The appropriate configuration and log
directories and config files will be created as well according to the
attributes node['openresty']['dir'] and 'node['openresty']['log_dir'].

The recipe attempts to detect whether additional modules should be
added to the configure command through recipe inclusion (see below),
and whether the version or configuration flags have changed and should
trigger a recompile.

Many features are automatically detected and enabled into the NGINX default
configuration file such as AIO support for Linux kernels >= 2.6.22, IPv6 support
and CPU worker affinity.

The NGINX service will be managed with the init scripts that will be installed
by the cookbook.

Includes the ohai_plugin recipe so the plugin is available.

ohai_plugin.rb

This recipe provides an Ohai plugin as a template. It is automatically included
by the default.rb recipe.

fair_module.rb, http_*_module.rb, upload_progress_module.rb

These recipes are automatically included by the default.rb recipe according to
the node['openresty']['modules'] array and provide compiled-in additional
features to the standard OpenResty NGINX compile. Check each recipe separately
for more information.

http_stub_status_module.rb

Special mention needs to be made for the stub status module. The approach followed
here is to create an include file with proper directives (set in the
status_module.rb attribute file) that can be included in any NGINX configuration
virtual host via the include directive:

include /etc/nginx/conf.d/nginx_status.conf.inc;

Adding New Modules

To add a new module to be compiled into NGINX in the source recipe,
the node's run state is manipulated in a recipe, and the module as a
recipe should be added to node['openresty']['modules']. For
example:

node.run_state['openresty_configure_flags'] =
  node.run_state['openresty_configure_flags'] | ["--with-http_stub_status_module"]

The recipe will be included by recipe[nginx::default] automatically,
adding the configure flags. Add any other configuration templates or
other resources as required. See the recipes described above for
examples.

In order to include extra-cookbook modules (most probably via an application
cookbook), you can use the node['openresty']['extra_modules'] array,
which takes as elements full recipe references like

'recipe[my_openresty::module_42istheanswerforeveryhing]'

The extra-cookbook modules will be included in the same manner as the standard
intra-cookbook modules.

LWRP

The cookbook includes the openresty_site LWRP (in contrast to the original
nginx_site cookbook definition script). The LWRP can be used in the same manner
as nginx_site and offers resource notifications (an advantage LWRPs
offer over simpler definitions). It also includes a timing parameter that can
be used to notify the nginx process to restart immediately based on configuration
file changes. The LWRP can be used like

openresty_site "site.example.com" do
    action :enable
    timing :immediately
end

Ohai Plugin

The ohai_plugin recipe includes an Ohai plugin. It will be
automatically installed and activated, providing the following
attributes via ohai, no matter how NGINX is installed (source or
package):

• node['nginx']['version'] - version of NGINX
• node['nginx']['configure_arguments'] - options passed to ./configure when NGINX was built.
• node['nginx']['prefix'] - installation prefix
• node['nginx']['conf_path'] - configuration file path

The Ohai plugin is generally used to determine whether control
attributes for building NGINX have changed.

Usage

Include the recipe on your node or role. Modify the
attributes as required in your role to change how various
configuration is applied per the attributes section above. In general,
override attributes in the role should be used when changing
attributes.

License and Author

• Author:: Panagiotis Papadomitsos (pj@ezgr.net)

A whole lot of this cookbook was based on original work by:

• Author:: Joshua Timberman (joshua@opscode.com)
• Author:: Adam Jacob (adam@opscode.com)
• Author:: AJ Christensen (aj@opscode.com)
• Author:: Jamie Winsor (jamie@vialstudios.com)

Copyright 2012, Panagiotis Papadomitsos

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.