Module: Dcmgr

Included in:
Tags
Defined in:
lib/dcmgr/endpoints/metadata.rb,
lib/dcmgr.rb,
lib/dcmgr/logger.rb,
lib/dcmgr/scheduler.rb,
lib/dcmgr/models/base.rb,
lib/dcmgr/endpoints/errors.rb,
lib/dcmgr/endpoints/core_api.rb,
lib/dcmgr/helpers/cli_helper.rb,
lib/dcmgr/scheduler/find_last.rb,
lib/dcmgr/models/physical_host.rb,
lib/dcmgr/scheduler/find_random.rb,
lib/dcmgr/endpoints/core_api_mock.rb,
lib/dcmgr/node_modules/instance_ha.rb,
lib/dcmgr/node_modules/hva_collector.rb,
lib/dcmgr/node_modules/sta_collector.rb

Overview

Metadata service endpoint for running VMs. The running VM can not identify itself that who or where i am. The service supplies these information from somewhere out of the VM. It publishes some very crucial information to each VM so that the access control to this service is mandated at both levels, the network and the application itself.

The concept of the service is similar with Amazon EC2’s Metadata service given via 169.254.169.254/. The difference is the URI structure. This gives the single point URI as per below:

http://metadata.server/[version]/meatadata.[format]

It will return a document which results in a syntax specified in the last extension field. The document contains over all information that the VM needs for self recoginition.

Defined Under Namespace

Modules: Endpoints, Helpers, Logger, Models, NodeModules, PhysicalHostScheduler, Stm, Tags, Web

Constant Summary collapse

VERSION = 
'10.12.0'

Class Method Summary collapse

Class Method Details

.conf ⇒ Object 



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# File 'lib/dcmgr.rb', line 7

def conf
  @conf
end

.configure(config_path = nil, &blk) ⇒ Object 



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# File 'lib/dcmgr.rb', line 11

def configure(config_path=nil, &blk)
  return self if @conf
  
  if config_path.is_a?(String)
    raise "Could not find configration file: #{config_path}" unless File.exists?(config_path)

    require 'configuration'
    code= <<-__END
    Configuration('global') do
      #{File.read(config_path)}
    end
    __END
    @conf = eval(code)
  else
    @conf = Configuration.for('global', &blk)
  end

  self
end

.initializer_hooks(&blk) ⇒ Object 



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# File 'lib/dcmgr.rb', line 38

def initializer_hooks(&blk)
  @initializer_hooks ||= []
  if blk
    @initializer_hooks << blk
  end
  @initializer_hooks
end

.run_initializers ⇒ Object 



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# File 'lib/dcmgr.rb', line 31

def run_initializers()
  raise "Complete the configuration prior to run_initializers()." if @conf.nil?
  initializer_hooks.each { |n|
    n.call
  }
end