Chef：嘗試添加時在節點上未定義的節點屬性或方法“ <<”

Question

在我的PostgreSQL配方屬性文件中，我有：

default['postgresql']['pg_hba'] = {
    :comment => '# IPv4 local connections',
    :type => 'host',
    :db => 'all',
    :user => 'all',
    :addr => '127.0.0.1/32',
    :method => 'md5'
}

我想將自己的服務器自動添加到pg_hga配置文件中，如下所示：

lambda {
  if Chef::Config[:solo]
    return (Array.new.push node)
  end
  search(:node, "recipes:my_server AND chef_environment:#{node.chef_environment} ")
}.call.each do |server_node|
  node['postgresql']['pg_hba'] << {
      :comment => "# Enabling for #{server_node['ipaddress']}",
      :type => 'host',
      :db => 'all',
      :user => 'all',
      :addr => "#{server_node['ipaddress']}/32",
      :method => 'trust'
  }
end

include_recipe 'postgresql'

但是我收到一個錯誤：

NoMethodError
-------------
Undefined node attribute or method `<<' on `node'

35:    node['postgresql']['pg_hba'] << {
36:        :comment => "# Enabling for #{server_node['ipaddress']}",
37:        :type => 'host',
38:        :db => 'all',
39:        :user => 'all',
40:        :addr => "#{server_node['ipaddress']}/32",
41:        :method => 'trust'
42>>   }
43:  end
44:  
45:  include_recipe 'postgresql'

Answer 1

您的問題在這里：

node['postgresql']['pg_hba'] << {

這樣，您可以訪問屬性以進行讀取。

假設要保持默認級別，則必須使用默認方法，如下所示：

node.default['postgresql']['pg_hba'] << { ... }

這將調用默認方法（例如在屬性文件中）以添加條目。

為此，第一個屬性聲明應該是一個數組（或哈希的哈希），如下所示：

default['postgresql']['pg_hba'] = [{ # notice the [ opening an array
    :comment => '# IPv4 local connections',
    :type => 'host',
    :db => 'all',
    :user => 'all',
    :addr => '127.0.0.1/32',
    :method => 'md5'
}] # Same here to close the array