在 AWS Opsworks 中运行的 Chef 11.10.4 环境。
我不知道如何通过节点属性传递下面的“each do”块变量“lyr”的值node['aws-tag'][#{lyr}]？
下面的代码块从 02-06 行开始有效，但从 07-14 行开始无效。
[01] include_recipe "aws"
[02] unless node['aws-tag']['tags'].empty? || node['aws-tag']['tags'].nil?
[03] aws_resource_tag node['ec2']['instance_id'] do
[04] tags(node['aws-tag']['tags'])
[05] action :update
[06] end
[07] node['opsworks']['instance']['layers'].each do |lyr|
[08] unless node['aws-tag'][#{lyr}].empty? || node['aws-tag'][#{lyr}].nil?
[09] aws_resource_tag node['ec2']['instance_id'] do
[10] tags(node['aws-tag'][#{lyr}])
[11] action :update
[12] end
[13] end
[14] end
[15] end
以下是 chef-shell 的结果，显示了上述代码中引用的属性的值：
chef > 节点['opsworks']['instance']['layers'] => ["mongodb"]
chef > 节点['aws-tag'] => {“tags”=>{“application”=>“app1”、“environment”=>“dev”}、“mongodb”=>{“service”=>“mongodb”}}
注意：我正在修改chef-aws-tagcookbook 使用中的标签标记所有 ec2 实例node['aws-tag']['tags']，此外还标记每个 ec2 实例 opsworks 层特定标签，这些标签包含在通过层传递给 opsworks 的自定义 json 中，在本例中为node['aws-tag']['mongodb']或 的内容node['aws-tag']['LAYER']，一般而言。
如果我运行上述代码，我会收到一个配方编译错误：“意外的 keyword_do_block，预期为‘]’”——请参阅下面来自 opsworks 的详细错误消息：
================================================================================
Recipe Compile Error in /var/lib/aws/opsworks/cache.stage2/cookbooks/chef-aws-tag/recipes/ec2.rb
================================================================================
SyntaxError
-----------
/var/lib/aws/opsworks/cache.stage2/cookbooks/chef-aws-tag/recipes/ec2.rb:9: syntax error, unexpected keyword_do_block, expecting ']'
/var/lib/aws/opsworks/cache.stage2/cookbooks/chef-aws-tag/recipes/ec2.rb:12: syntax error, unexpected keyword_end, expecting ']'
Cookbook Trace:
---------------
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/mixin/from_file.rb:30:in `instance_eval'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/mixin/from_file.rb:30:in `from_file'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/cookbook_version.rb:237:in `load_recipe'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/run_context.rb:151:in `load_recipe'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/run_context/cookbook_compiler.rb:139:in `block in compile_recipes'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/run_context/cookbook_compiler.rb:137:in `each'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/run_context/cookbook_compiler.rb:137:in `compile_recipes'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/run_context/cookbook_compiler.rb:74:in `compile'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/run_context.rb:86:in `load'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/policy_builder/expand_node_object.rb:75:in `setup_run_context'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/client.rb:252:in `setup_run_context'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/client.rb:413:in `do_run'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/client.rb:200:in `block in run'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/client.rb:194:in `fork'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/client.rb:194:in `run'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/application.rb:215:in `run_chef_client'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/application/client.rb:314:in `block in run_application'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/application/client.rb:306:in `loop'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/application/client.rb:306:in `run_application'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/application.rb:66:in `run'
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/bin/chef-client:26:in `<top (required)>'
/opt/aws/opsworks/current/bin/chef-client:16:in `load'
/opt/aws/opsworks/current/bin/chef-client:16:in `<main>'
Relevant File Content:
----------------------
/opt/aws/opsworks/releases/20141010064749_328/vendor/bundle/ruby/2.0.0/gems/chef-11.10.4/lib/chef/mixin/from_file.rb:
23:
24: # Loads a given ruby file, and runs instance_eval against it in the context of the current
25: # object.
26: #
27: # Raises an IOError if the file cannot be found, or is not readable.
28: def from_file(filename)
29: if File.exists?(filename) && File.readable?(filename)
30>> self.instance_eval(IO.read(filename), filename, 1)
31: else
32: raise IOError, "Cannot open or read #{filename}!"
33: end
34: end
35:
36: # Loads a given ruby file, and runs class_eval against it in the context of the current
37: # object.
38: #
39: # Raises an IOError if the file cannot be found, or is not readable.
[2014-10-28T17:43:22+00:00] ERROR: Running exception handlers
[2014-10-28T17:43:22+00:00] ERROR: Exception handlers complete
[2014-10-28T17:43:22+00:00] FATAL: Stacktrace dumped to /var/lib/aws/opsworks/cache.stage2/chef-stacktrace.out
[2014-10-28T17:43:22+00:00] ERROR: /var/lib/aws/opsworks/cache.stage2/cookbooks/chef-aws-tag/recipes/ec2.rb:9: syntax error, unexpected keyword_do_block, expecting ']'
/var/lib/aws/opsworks/cache.stage2/cookbooks/chef-aws-tag/recipes/ec2.rb:12: syntax error, unexpected keyword_end, expecting ']'
[2014-10-28T17:43:22+00:00] FATAL: Chef::Exceptions::ChildConvergeError: Chef run process exited unsuccessfully (exit code 1)
答案1
第 8 行对我来说看起来很可疑，应该会引发错误，如下所示......
unless node['aws-tag'][#{lyr}].empty? || node['aws-tag'][#{lyr}].nil?
应该是字符串插值，但事实并非如此。
尝试以下行：
unless node['aws-tag']["#{lyr}"].empty? || node['aws-tag']["#{lyr}"].nil?
如果lyr已经是一个字符串，则只需lyr像这样使用：
unless node['aws-tag'][lyr].empty? || node['aws-tag'][lyr].nil?