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nodes (6) Versions 0.0.5

store node attributes in data bag items

Berkshelf/Librarian
Policyfile
Knife
cookbook 'nodes', '~> 0.0.5'
cookbook 'nodes', '~> 0.0.5', :supermarket
knife cookbook site install nodes
knife cookbook site download nodes
README
Dependencies
Quality

nodes cookbook

This is a cookbook for managing node attributes in data bags.

The idea is, you probably keep your cookbooks, roles, environments, and data bags under version control, and maybe you even upload them via a CI server. Great. But then you can also set attributes on individual nodes using knife node edit. That doesn't sound like a good idea for long-term maintainability. Some people create per-node roles, but that doesn't seem very attractive.

So the solution proposed here is to store per-node attributes in data bag items. To make node-specific attribute changes, you just manipulate and upload your data bags using your normal change process. And include this cookbook in your run list to make the changes effective.

More precisely, at this to your run list, ideally very early:

recipe[nodes]

Structure your data bags this way:

data_bags/
+---nodes/
    +---host1.example.com.json
    +---host2.example.com.json

The data bag item name should be the Chef node name (usually the host name, but not necessarily).

The individual per-node data bag items should look like this:

{
  "id": "host1.example.com",

  "default_attributes": {
    "foo1": "bar1"
  },
  "force_default_attributes": {
    "foo2": "bar2"
  },
  "override_attributes": {
    "foo3": "bar3"
  },
  "force_override_attributes": {
    "foo4": "bar4"
  }
}

This looks very similar to a role or environment JSON file.

The attributes are actually applied in a recipe, so they have lower precedence than roles or environments. Since a per-node setting is usually supposed to override such global settings, the force_ variants will often be useful.

Here is a somewhat realistic example:

{
  "id": "specialhost.example.com",

  "force_override_attributes": {
    "sysctl": {
      "params": {
        "vm": {
          "swappiness": 0
        }
      }
    }
  }
}

Dependent cookbooks

This cookbook has no specified dependencies.

Contingent cookbooks

There are no cookbooks that are contingent upon this one.

Collaborator Number Metric
            

0.0.5 failed this metric

Failure: Cookbook has 0 collaborators. A cookbook must have at least 2 collaborators to pass this metric.

Contributing File Metric
            

0.0.5 failed this metric

Failure: To pass this metric, your cookbook metadata must include a source url, the source url must be in the form of https://github.com/user/repo, and your repo must contain a CONTRIBUTING.md file

Foodcritic Metric
            

0.0.5 failed this metric

FC064: Ensure issues_url is set in metadata: nodes/metadata.rb:1
FC065: Ensure source_url is set in metadata: nodes/metadata.rb:1
FC066: Ensure chef_version is set in metadata: nodes/metadata.rb:1
FC067: Ensure at least one platform supported in metadata: nodes/metadata.rb:1
Run with Foodcritic Version 11.1.0 with tags metadata,correctness ~FC031 ~FC045 and failure tags any

License Metric
            

0.0.5 passed this metric

No Binaries Metric
            

0.0.5 passed this metric

Publish Metric
            

0.0.5 passed this metric

Supported Platforms Metric
            

0.0.5 failed this metric

nodes should declare what platform(s) it supports.

Testing File Metric
            

0.0.5 failed this metric

Failure: To pass this metric, your cookbook metadata must include a source url, the source url must be in the form of https://github.com/user/repo, and your repo must contain a TESTING.md file

Version Tag Metric
            

0.0.5 passed this metric