Jump To …

source.rb

The default version of nginx that gets downloaded and installed. Even if this code base doesn’t get updated, you can update your node DNA JSON file.

 
default[:nginx][:version]      = "0.9.7"

The install path for nginx using an attribute already defined. If you override the node[:nginx][:version] in another place (and it wins) then this value gets dynamically updated. In other words, you can chain attributes to build new ones.

 
default[:nginx][:install_path] = "/opt/nginx-#{nginx[:version]}"

See, how’s that for DRY?

 
default[:nginx][:src_binary]   = "#{nginx[:install_path]}/sbin/nginx"

There is actually a slightly better way to approach this by using a Chef builtin property called Chef::Config[:file_cache_path]. Just one more way to make your recipes that much more portable.

 
default[:nginx][:archive_cache] = "/var/cache/downloads/nginx"

Our download URL again. Now we’re interpolating even more to keep things DRY and flexible.

 
default[:nginx][:tar_url] =
  "http://sysoev.ru/nginx/nginx-#{node[:nginx][:version]}.tar.gz"

What was this again, oh yeah.

 
default[:nginx][:tar_checksum] =
  "2feb0acee473cc360a620ee862907b9570a4121956c40cbd27da35f5b0a96045"

We don’t get into platform independance in this lab, but there is a lot we can do here to make this recipe portable to the Mac, debian, arch linux, centos, etc.

 
default[:nginx][:packages] = %w{ build-essential binutils-doc autoconf
                                 flex bison libpcre3 libpcre3-dev
                                 libssl-dev }

Here are our default configure flags again.

 
default[:nginx][:configure_flags] = [
  "--prefix=#{nginx[:install_path]}",
  "--conf-path=#{nginx[:dir]}/nginx.conf",
  "--with-http_ssl_module",
  "--with-http_gzip_static_module"
]

But this time we’ve added an additional attribute as a hook. We can add other compilation flags in here, without stomping on our sane defaults or accidentally killing some of them.

 
default[:nginx][:extra_configure_flags] = []