chef data_bags的使用

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原文链接：https://www.tutorialspoint.com/chef/chef_data_bags.htm

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本文详细介绍了如何使用Chef来与HTTP端点进行通信。首先创建了一个名为`hooks`的数据包目录，并在其中定义了请求Bin的URL。接着，在Chef服务器上创建并上传了该数据包。然后在默认食谱中更新了代码，从数据包中获取URL以发起HTTP请求。最后，运行Chef客户端验证了请求的执行。这个过程展示了如何在Chef中利用数据包存储和检索配置信息。

Working Method

In the following setup, we are trying to communicate to http endpoint URL. For this, we need to create a data bag, which will hold the endpoint URL detail and use it in our recipe.

Step 1 − Create a directory for our data bag.

mma@laptop:~/chef-repo $ mkdir data_bags/hooks

Step 2 − Create a data bag item for request bin. One needs to make sure one is using a defined requestBin URL.

vipi@laptop:~/chef-repo $ subl data_bags/hooks/request_bin.json { 
   "id": "request_bin", 
   "url": "http://requestb.in/1abd0kf1" 
}

Step 3 − Create a data bag on the Chef server

vipin@laptop:~/chef-repo $ knife data bag create hooks 
Created data_bag[hooks]

Step 4 − Upload the data bag to the Chef server.

vipin@laptop:~/chef-repo $ knife data bag from file hooks requestbin.json 
Updated data_bag_item[hooks::RequestBin]

Step 5 − Update the default recipe of the cookbook to receive the required cookbook from a data bag.

vipin@laptop:~/chef-repo $ subl cookbooks/my_cookbook/recipes/default.rb 
hook = data_bag_item('hooks', 'request_bin') 
http_request 'callback' do 
   url hook['url'] 
end

Step 6 − Upload the modified cookbook to the Chef server.

vipin@laptop:~/chef-repo $ knife cookbook upload my_cookbook 
Uploading my_cookbook [0.1.0]

Step 7 − Run the Chef client on the node to check if the http request bin gets executed.

user@server:~$ sudo chef-client 
...TRUNCATED OUTPUT... 
[2013-02-22T20:37:35+00:00] INFO: http_request[callback] 
GET to http://requestb.in/1abd0kf1 successful 
...TRUNCATED OUTPUT...

How it Works

Data bag is a named collection of structure data entries. One needs to define data entry and call the data bag item in JSON file. One can also search for data bag item from within the recipes to use the data stored in the data bags.

We created a data bag called hooks. A data bag is a directory within Chef repository. We used knife to create it on the server.