Is there a way to get a mutual exception in a node chef?

Question

For example, if a process updates a node while the chef client is running, the chef-client will overwrite the node data:

• chef-client receives node data (state 1)
• Process A receives node data (state 1)
• Process A locally updates node data (state 2)
• This process saves node data (state 2)
• chef-client updates locally node data (2 * state)
• chef-client stores node data, and this node data does not contain changes in process A (state 2). The chef is overwriting the node data. (state 2 *)

The same thing happens if we have two processes storing node data at the same moment.

EDIT

We need an external modification, because we have a good Chef server user interface for remote management of many computers shown as a tree (similar to LDAP). The administrator can update the value of recipes from here. This project is OpenSource: https://github.com/gecos-team/

Although we had a semaphore system, we found that if we have two or more simultaneous queries, we might have a match problem:

• In the normal case, the system works
• But sometimes the system does not work

EDIT 2

I have added a document with a lot of information about our problem.

Answer 1

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Answer 2

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Answer 3

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Answer 4

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Answer 5

If you want to disable dependency on another external service, perhaps you can use some slicing time.

Roughly: nodes only run the chef client for odd minutes. Api updates the chef’s data even within minutes (distribute these even minutes if you have a longer queue).