Kondate

Kondate is yet another nodes management framework for Itamae/Serverspec.

Kondate provides nodes/roles/attributes/run_lists management feature for Itamae/Serverspec.

Installation

Add this line to your application's Gemfile:

gem 'kondate'

And then execute:

$ bundle

Or install it yourself as:

$ gem install kondate

Usage

Generate a template directory tree:

$ bundle exec kondate init .

Run itamae:

$ bundle exec kondate itamae <host>

Run serverspec:

$ bundle exec kondate serverspec <host>

Run itamae for multiple hosts of a given role in parallel:

$ bundle exec kondate itamae-role <role>

Run serverspec for multiple hosts of a given role in parallel:

$ bundle exec kondate serverspec-role <role>

Configuration

kondate init provides a template directory tree such as:

.
├── .kondate.conf     # kondate configuration
├── bootstrap.rb      # itamae bootstrap
├── hosts.yml         # manages hostnames and its roles
├── properties        # manages run_lists and attributes
│   ├── nodes         # host specific properties
│   ├── roles         # role properties
│   └── environments  # environment properties
├── recipes           # itamae recipes
│   ├── middleware    # middleware recipes
│   │   └── base
│   │       └── default.rb
│   └── roles         # role recipes
└── spec              # serverspec specs
    ├── middleware    # middleware recipes specs
    │   └── base_spec.rb
    ├─  roles         # role recipes specs
    └── spec_helper.rb
├── secrets           # manages secrets attributes such as passwords
│   ├── properties
│   │   ├── environments
│   │   ├── nodes
│   │   └── roles
│   ├── recipes
│   │   ├── middleware
│   │   └── roles
│   └── spec
│       ├── middleware
│       └── roles

.kondate.conf

The default .kondate.conf looks like below:

middlware_recipes_dir: recipes/middleware
roles_recipes_dir: recipes/roles
middleware_recipes_serverspec_dir: spec/middleware
roles_recipes_serverspec_dir: spec/roles
nodes_properties_dir: properties/nodes
roles_properties_dir: properties/roles
environments_properties_dir: properties/environments
secret_middlware_recipes_dir: secrets/recipes/middleware
secret_roles_recipes_dir: secrets/recipes/roles
secret_middleware_recipes_serverspec_dir: secrets/spec/middleware
secret_roles_recipes_serverspec_dir: secrets/spec/roles
secret_nodes_properties_dir: secrets/properties/nodes
secret_roles_properties_dir: secrets/properties/roles
secret_environments_properties_dir: secrets/properties/environments
plugin_dir: lib
host_plugin:
  type: file
  path: hosts.yml

You can customize the directory tree with this conf.

Itamae options

You can configure itamae-kondate options on .kondate.conf, too as:

itamae_options:
  shell: /bin/bash

See itamae-kondate --help for option list.

Serverspec options

You can configure serversepc-kondate options on .kondate.conf, too as:

serverspec_options:
  vagrant: true

See serverspec-kondate --help for option list.

hosts.yml

The default uses file host plugin, and hosts.yml. The contents of hosts.yml look like below:

localhost: [sample]

where keys are host names, and values are array of roles.

$ bundle exec kondate itamae <host>

works as follows:

1. obtains a role list from hosts.yml
2. reads properties/roles/#{role}.yml, and find recipes and its attributes
3. runs recipes

You can create your own host plugin. See Host Plugin section for more details.

properties

Property files are places to write recipes to run and attributes values.

├── properties        # manages run_lists and attributes
│   ├── nodes         # host specific properties
│   ├── roles         # role properties
│   └── environments  # environment properties

An example looks like below:

properties/roles/#{role}.yml

attributes:
  ruby:
    versions: [2.2.3]
    gems:
      2.2.3: [bundler]
  node:
    versions: [v0.12.2]
    global: v0.12.2
  nginx:

The attributes variables are accessible like attrs['ruby']['versions'], which is equivalent and short version of node['attributes']['ruby']['versions'] in recipes.

You can also prepare host-specific property files such as:

properties/nodes/#{host}.yml

attributes:
  nginx:
    worker_processes: 8

In addition, you can also prepare environment property files such as:

properties/environments/#{ENV['ENVIRONMENT'] || 'development'}.yml

global_attributes:
  aws_region: ap-northeast-1

where global_attributes is accessible like global_attrs['aws_region'], which is equivalent and short version of node['global_attributes']['aws_region'] in recipes.

These files are merged on kondate execution in order of environment + role + node (node > role > environment in the strong order).

secret properties

Secret properties are places to write confidential attributes.

├── secrets         # manages secrets attributes such as passwords
│   └── properties
│       ├── nodes
│       ├── roles
│       └── environments

An example looks like below:

secrets/properties/roles/sample.yml

attributes:
  base:
    password: xxxxxxxx

These files are merged with property files on kondate execution.

Hint: I manage secret property files on github private repository. ToDo: support encryption.

recipes

Put you itamae recipes:

├── recipes         # itamae recipes
│   ├── middleware  # middleware recipes
│   │   └── base
│   │       └── default.rb
│   └── roles       # role recipes

middleware recipes are usual recipes to write how to install middleware such as nginx, mysql.

role recipes are places to write role-specific provisioning. I often write recipes to create log directories for my app (role), for example.

recipes/roles/myapp/default.rb

directory "/var/log/myapp" do
  owner myapp
  group myapp
  mode 0755
end

spec

Put your serverspec specs.

└── spec            # serverspec specs
    ├── middleware  # middleware recipes specs
    └── roles       # role recipes specs

It is required that spec/spec_helper has lines:

set :host, ENV['TARGET_HOST']
set :set_property, YAML.load_file(ENV['TARGET_NODE_FILE'])

because these ENVs are passed by kondate serverspec.

Configuring following lines for vagrant is also recommended:

  if ENV['TARGET_VAGRANT']
    `vagrant up #{host}`

    config = Tempfile.new('', Dir.tmpdir)
    config.write(`vagrant ssh-config #{host}`)
    config.close

    Net::SSH::Config.for(host, [config.path])
  else

ENV['TARGET_VAGRANT'] is turned on if kondate serverspec is executed with --vagrant option.

See templates/spec/spec_helper.rb for an example.

Exploring role files

Available version: >= v0.4.0

Assume role is delimited with - (you can configure the delimiter) such as myapp-web-staging, this feature explores role files in order of:

1. myapp-web-staging.yml
2. myapp-web-base.yml
3. myapp-web.yml
4. myapp-base.yml
5. myapp.yml
6. base.yml

This makes it possible to share a property file, for example, myapp-web.yml among myapp-web-staging and myapp-web-production roles.

To enable this feature, you need to configure .kondate.conf as:

explore_role_files: true # default is false
role_delimiter: "-" # default is -

Host Plugin

The default reads hosts.yml to resolve roles of a host, but you may want to resolve roles from AWS EC2 roles tag, or you may want to resolve roles from your own host resolver API application.

Thus, kondate provides a plugin system to resolve hosts' roles.

Naming Convention

You must follow the below naming conventions:

• gem name: kondate-host_plugin-xxx (xxx_yyy) (if you want to make a gem)
• file name: lib/kondate/host_plugin/xxx.rb (xxx_yyy.rb)
• class name: Kondate::HostPlugin::Xxx (XxxYyy)

If you want to put your own host plugin locally without publishing a gem, you can configure the location with .kondate.conf as:

plugin_dir: lib

Interface

What you have to implement are #initialize, #get_environment, and #get_roles methods. get_hostinfo method is an optional method to return arbitrary hostinfo of the host (available from kondate 0.2.0). Here is an example of file plugin:

require 'yaml'

module Kondate
  module HostPlugin
    # YAML format
    #
    # host1: [role1, role2]
    # host2: [role1, role2]
    class File < Base
      # @param [HashWithIndifferentAccess] config
      def initialize(config)
        super
        raise ConfigError.new('file: path is not configured') unless config.path
        @path = config.path

        @roles_of_host = YAML.load_file(@path)
        @hosts_of_role = {}
        @roles_of_host.each do |host, roles|
          roles.each do |role|
            @hosts_of_role[role] ||= []
            @hosts_of_role[role] << host
          end
        end
      end

      # @param [String] host hostname
      # @return [String] environment name
      def get_environment(host)
        ENV['ENVIRONMENT'] || 'development'
      end

      # @param [String] host hostname
      # @return [Array] array of roles
      def get_roles(host)
        @roles_of_host[host]
      end

      # @param [String] role role
      # @return [Array] array of hosts
      #
      # Available from kondate >= 0.3.0
      def get_hosts(role)
        @hosts_of_role[role]
      end

      # Optional
      #
      # @param [String] host hostname
      # @return [Hash] arbitrary hostinfo
      def get_hostinfo(host)
        {}
      end
    end
  end
end

Config

config parameter of #initialize is created from the configuration file (.kondate.conf):

host_plugin:
  type: file
  path: hosts.yml

config.type and config.path is available in the above config.

See Also

• Itamae meetup #1 で「ぼくのかんがえた Itamae/Serverspec 構成フレームワーク 〜 板前の献立 〜」というトークをしてきた (Japanese)

Development

bundle exec exe/kondate init .
vagrant up

bundle exec exe/kondate itamae vagrant-centos --vagrant --role sample
bundle exec exe/kondate serverspec vagrant-centos --vagrant --role sample

ToDo

write tests

License

The gem is available as open source under the terms of the MIT License.