ruby-on-rails - 在 Recipe 中访问 Chef 数据包

Question

我创建了以下数据包项目:

{
  "name": "data_bag_item_nameservers_servers",
  "json_class": "Chef::DataBagItem",
  "chef_type": "data_bag_item",
  "data_bag": "nameservers",
  "raw_data": {
    "id": "servers",
    "serverslist": [
      "xxx.xxx.xxx.xxx",
      "xxx.xxx.xxx.xxx"
    ]
  }
}

在模板 erb 中，我在电话下方添加了，

<% @serverslist.each_with_index do |nmserver| %>
nameserver <%= nmserver %>
<% end %>

但它对我不起作用，并给出错误，

Error executing action create on resource 'template[/etc/resolve.conf]'

Chef::Mixin::Template::TemplateError

undefined method each_with_index' for nil:NilClass

有人可以帮助我如何在食谱配方中调用这些数据包项目值吗？

提前致谢!

Answer 1

您是否考虑过使用节点属性的更简单的选项？

在运行时很容易覆盖说明书默认设置。我指出这一点是因为根据我的经验很少需要数据包。

我已经包括了两个例子。

示例 1:使用属性

“演示”食谱

├── attributes
│   └── default.rb
├── Berksfile
├── Berksfile.lock
├── chefignore
├── metadata.rb
├── README.md
├── recipes
│   └── default.rb
├── templates
│   └── default
│       └── dummy.erb
└── test
    └── integration
        ├── default
        │   └── serverspec
        │       └── default_spec.rb
        └── helpers
            └── serverspec
                └── spec_helper.rb

属性/default.rb

default['demo']['nameservers']['one'] = "one"
default['demo']['nameservers']['two'] = "two"
default['demo']['nameservers']['three'] = "three"

食谱/default.rb

template "/etc/dummy" do
  source "dummy.erb"
  owner 'root'
  group 'root'
  mode '0644'
end

模板/默认/dummy.erb

<% node['demo']['nameservers'].each do |name,server| %>
nameserver <%= server %>
<% end %>

测试/集成/默认/serverspec/default_spec.rb

require 'spec_helper'

describe file('/etc/dummy') do
  it { should be_file }
  it { should be_owned_by 'root' }
  it { should contain 'nameserver one' }
  it { should contain 'nameserver two' }
  it { should contain 'nameserver three' }
end

示例 2:使用数据包

测试/集成目录下带有测试数据包的“演示”食谱

├── Berksfile
├── Berksfile.lock
├── chefignore
├── metadata.rb
├── README.md
├── recipes
│   └── default.rb
├── templates
│   └── default
│       └── dummy.erb
└── test
    └── integration
        ├── data_bags
        │   └── stuff
        │       └── nameservers.json
        ├── default
        │   └── serverspec
        │       └── default_spec.rb
        └── helpers
            └── serverspec
                └── spec_helper.rb

测试/集成/data_bags/stuff/nameservers.json

样本数据

{
  "id": "nameservers",
  "list": [
    "one",
    "two",
    "three"
  ]
}

食谱/default.rb

现在配方更复杂了。必须显式检索数据包中的数据，然后将其作为变量传递到模板中

nameservers = data_bag_item('stuff', "nameservers")

template "/etc/dummy" do
  source "dummy.erb"
  owner 'root'
  group 'root'
  mode '0644'
  variables ({
    "servers" => nameservers["list"]
  })
end

模板/默认/dummy.erb

<% @servers.each do |server| %>
nameserver <%= server %>
<% end %>

测试/集成/默认/serverspec/default_spec.rb

require 'spec_helper'

describe file('/etc/dummy') do
  it { should be_file }
  it { should be_owned_by 'root' }
  it { should contain 'nameserver one' }
  it { should contain 'nameserver two' }
  it { should contain 'nameserver three' }
end