Chef's chef does not work according to the ohai undefined `[] 'method for nil: NilClass

Question

I am working on a cook cookbook to set up vanilla ubuntu 12.04.2 with nginx postgresql and a unicorn on my stray box, but I am having problems with nginx, there is an exception

undefined method `[]' for nil:NilClass 

upon installation, which appear to be related to the ohai configuration.

I posted everything that I have:

 https://github.com/DonGiulio/mychef 

here is the conclusion from the chef:

 Starting Chef Client, version 11.4.0 Compiling Cookbooks... ================================================================================ Recipe Compile Error in /var/chef/cookbooks/nginx/recipes/source.rb ================================================================================ NoMethodError ------------- undefined method `[]' for nil:NilClass Cookbook Trace: --------------- /var/chef/cookbooks/nginx/recipes/ohai_plugin.rb:27:in `from_file' /var/chef/cookbooks/nginx/recipes/source.rb:42:in `from_file' Relevant File Content: ---------------------- /var/chef/cookbooks/nginx/recipes/ohai_plugin.rb: 20: # 21: 22: ohai 'reload_nginx' do 23: plugin 'nginx' 24: action :nothing 25: end 26: 27>> template "#{node['ohai']['plugin_path']}/nginx.rb" do 28: source 'plugins/nginx.rb.erb' 29: owner 'root' 30: group 'root' 31: mode '0755' 32: notifies :reload, 'ohai[reload_nginx]', :immediately 33: end 34: 35: include_recipe 'ohai::default' 36: [2013-11-19T14:22:23+00:00] ERROR: Running exception handlers [2013-11-19T14:22:23+00:00] ERROR: Exception handlers complete Chef Client failed. 0 resources updated [2013-11-19T14:22:23+00:00] FATAL: Stacktrace dumped to /var/chef/cache/chef-stacktrace.out [2013-11-19T14:22:23+00:00] FATAL: NoMethodError: undefined method `[]' for nil:NilClass 

and here is stacktrace:

 $ cat /var/chef/cache/chef-stacktrace.out Generated at 2013-11-19 14:22:23 +0000 NoMethodError: undefined method `[]' for nil:NilClass /var/chef/cookbooks/nginx/recipes/ohai_plugin.rb:27:in `from_file' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/mixin/from_file.rb:30:in `instance_eval' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/mixin/from_file.rb:30:in `from_file' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/cookbook_version.rb:346:in `load_recipe' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/run_context.rb:151:in `load_recipe' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/run_context.rb:132:in `block in include_recipe' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/run_context.rb:131:in `each' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/run_context.rb:131:in `include_recipe' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/dsl/include_recipe.rb:26:in `include_recipe' /var/chef/cookbooks/nginx/recipes/source.rb:42:in `from_file' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/mixin/from_file.rb:30:in `instance_eval' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/mixin/from_file.rb:30:in `from_file' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/cookbook_version.rb:346:in `load_recipe' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/run_context.rb:151:in `load_recipe' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/run_context/cookbook_compiler.rb:139:in `block in compile_recipes' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/run_context/cookbook_compiler.rb:137:in `each' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/run_context/cookbook_compiler.rb:137:in `compile_recipes' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/run_context/cookbook_compiler.rb:74:in `compile' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/run_context.rb:86:in `load' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/client.rb:224:in `setup_run_context' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/client.rb:467:in `do_run' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/client.rb:200:in `run' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/application.rb:190:in `run_chef_client' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/application/solo.rb:239:in `block in run_application' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/application/solo.rb:231:in `loop' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/application/solo.rb:231:in `run_application' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/application.rb:73:in `run' /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/bin/chef-solo:25:in `<top (required)>' /usr/bin/chef-solo:23:in `load' /usr/bin/chef-solo:23:in `<main>' 

UPDATE 1 I am providing a box with ruby-2.0.0-p247 , is it possible to depend on an earlier version of ruby?

UPDATE 2 I tried with ruby-1.9.3-p448 , in a freshly prepared box, the same problem, no change.

could you help me?

thanks,

Answer 1

You did not indicate which version of the ohai and nginx cookbooks you are using.

While I cannot answer your question, I can give some tips on managing your cookbooks using the dependency manager (think of a cookbook kit).

Install Berkshelf

 gem install berkshelf 

Create a Berkshelf File

 $ cat Berksfile site :opscode cookbook "nginx" 

And use this to download all the nginx related cookbooks:

 $ berks install -p cookbooks Using nginx (2.0.0) Using apt (2.3.0) Using bluepill (2.3.0) Using rsyslog (1.9.0) Using build-essential (1.4.2) Using ohai (1.1.12) Using runit (1.2.0) Using yum (2.3.2) 

The -p option places them in the cookbooks subdirectory:

 $ ls -d cookbooks/* cookbooks/apt cookbooks/build-essential cookbooks/ohai cookbooks/runit cookbooks/bluepill cookbooks/nginx cookbooks/rsyslog cookbooks/yum 

Answer 2

I experienced the same error. You can find 3 other solutions to this problem and an explanation of why this happens here in stackoverflow.

To mention one of those using Vagrant: just include the recipe through Vagrantfile "chef.add_recipe ()".

Using Berkshelf obviously solves the problem, and I really like it. Just think that we should save time for those who do not want to worry about installing new tools.

Answer 3

Get into it while trying to use a community cookbook. I solved it by specifying the latest version of the nginx cookbook in my metadata .rb: depends 'nginx', '>= 2.7.6'

The nexus cookie metadata.rb says: depends "nginx", ">= 1.8.0"

It seems that the chef will choose 1.8.0 when resolving spans, unless you specify a newer version.

Answer 4

it looks like the ruby ​​libraries were missing, I installed ruby ​​by running the following command on Ubuntu and it started working for me

 apt-get install ruby