java 如何打印或调试厨师属性？
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How print or debug chef attributes?
提问by Cherry
I have created chef cookbook with attributes. Then I tried to boostrap a code to node and pass additional attributes in addidition and/or override the defaults. Is it possible to print an attribute tree to see what attributes are loaded, which are overrided?
我创建了带有属性的厨师食谱。然后我尝试将代码提升到节点并传递附加属性和/或覆盖默认值。是否可以打印属性树以查看加载了哪些属性，哪些属性被覆盖？
回答by keen
To get the entire attribute tree (from inside a converged chef, as opposed to via knife from chef server - which is useless in, say, a solo environment...) in a useful form:
以一种有用的形式获取整个属性树（从融合的厨师内部，而不是通过厨师服务器的刀 - 这在例如单人环境中是无用的......）：
You're looking for node.to_hash- see http://www.rubydoc.info/gems/chef/Chef%2FNode%3Ato_hash
您正在寻找node.to_hash- 请参阅http://www.rubydoc.info/gems/chef/Chef%2FNode%3Ato_hash
A few other options in there too - http://www.rubydoc.info/gems/chef/Chef/Node
还有其他一些选项 - http://www.rubydoc.info/gems/chef/Chef/Node
to get a pretty printed log you can use chef's json libs pretty printer:
要获得漂亮的打印日志，您可以使用厨师的 json libs 漂亮打印机：
output="#{Chef::JSONCompat.to_json_pretty(node.to_hash)}"
log output
or write a file local to your client:
或写入本地文件到您的客户端：
output="#{Chef::JSONCompat.to_json_pretty(node.to_hash)}"
file '/tmp/node.json' do
content output
end
Note that this is the converged node, so you won't get the default/override/etc levels you can get with node.debug_value- but if you dont actually know the name/path of the attribute, or you need to loop over a number of attributes, this could be your friend.
请注意，这是聚合节点，因此您不会获得可以使用的默认/覆盖/等级别node.debug_value- 但如果您实际上不知道属性的名称/路径，或者您需要遍历多个属性，这可能是你的朋友。
You'll get a huge result that looks like (highly trimed!)
你会得到一个巨大的结果，看起来像（高度修剪！）
{
"chef_type": "node",
"name": "node.example.com",
"chef_environment": "_default",
"build-essential": {
"compile_time": false
},
"homebrew": {
"owner": null,
"auto-update": true,
...
},
"recipe": [
"example"
],
"run_list": [
"recipe[example]"
]
}
Thanks to this answerfor the pretty printer pointer
回答by Tejay Cardon
You can use node.debug_valueto show a single attribute. This will print out the value for that attribute at each level. However, doing this at each level for each attribute is harder (I'm not sure of a way to do it). Furthermore, because of the massive volume of attributes from ohai, I'm not sure you'd even want to do it.
您可以使用node.debug_value来显示单个属性。这将在每个级别打印出该属性的值。但是，在每个级别为每个属性执行此操作更难（我不确定有什么方法可以做到）。此外，由于 ohai 的大量属性，我不确定您是否愿意这样做。
If your chef run is completing correctly, you can do a knife node show -l <nodename>(that's a lower case L). That will show you the actual value, but it provides a huge volume of data, and doesn't tell you which values are default, normal, override, etc.
如果您的厨师运行正确完成，您可以做一个knife node show -l <nodename>（这是一个小写的 L）。这将向您显示实际值，但它提供了大量数据，并且不会告诉您哪些值是默认值、正常值、覆盖值等。
回答by wisbucky
Forking the answer by @keen, this produces a more human readable output in YAML format.
分叉@keen 的答案，这会以 YAML 格式生成更具人类可读性的输出。
output = node.to_yaml
file '/var/node.yaml' do
content output
end
回答by Deepan Prabhu Babu
At times, it might be easy to read the variables off a node, after they are provisioned.
有时，在提供变量后，从节点读取变量可能很容易。
knife node edit <hostname-here> -a
