Class: Sortinghat::Banquet

Inherits:
Object
  • Object
show all
Defined in:
lib/sortinghat/banquet.rb

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Banquet

Creation method



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# File 'lib/sortinghat/banquet.rb', line 8

def initialize(options = {})
  # Check that we have write premissions
  checkpermissions()

  # Create a syslog for us to use as an instance variable
  @log = Syslog::Logger.new 'sortinghat'

  # Append a trailing dot to the zone, if there isn't one
  if options[:zone][-1, 1] != '.'
    options[:zone] << '.'
  end

  # Save the options as instance variable
  @options = options

  # Create an instance varible to contain our AWS calls
  @aws = Sortinghat::AWS.new(@options[:region])
end

Instance Method Details

#dejavu? ⇒ Boolean

Method to figure out if we’ve been here before

Returns:

  • (Boolean) 


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# File 'lib/sortinghat/banquet.rb', line 28

def dejavu?
  # Check for sentinel file
  if File.exists?('/etc/.sorted')
    # We found it, log error and exit successfully
    @log.info('Found /etc/.sorted, refusing to sort.')
    exit 0
  end
end

#finish! ⇒ Object

Last method of Sortinghat



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# File 'lib/sortinghat/banquet.rb', line 87

def finish!
  # Create our sentinel file
  FileUtils.touch('/etc/.sorted')
end

#start! ⇒ Object

Main method of Sortinghat



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# File 'lib/sortinghat/banquet.rb', line 38

def start!

  # Best thing to avoid run conditions are to wait
  sleep rand(10)

  # Find out who is who, instances alive
  # If discover() returns an Array full of nil(s), alive will become an empty Array
  alive = cleanup(@aws.discover())

  # Given the alive instances, find our prefix
  # If alive an empty array, selection will return the number '1'
  @prefix = ensurezero(selection(alive))

  # Put together hostname/fqdn
  construction()

  # Set the Name tag on this instance
  @aws.settag!(@hostname)

  # Find out who is who, instances alive
  # If discover() returns an Array full of nil(s), alive will become an empty Array
  alive = cleanup(@aws.discover())

  # Only enter recursion if the uniq() length of the alive array does not equal the actual length
  # On AutoScalingGroup initalization, the cleanup() should ensure the alive array is empty not nil so uniq() works
  unless alive.uniq.length == alive.length
    # There are duplicates, remove tag, wait, restart
    @aws.removetag!()
    sleep rand(10)
    start!()
  end

  # Register in DNS
  @aws.setroute53(@options[:zone], @fqdn)

  # Set the localhost hostname
  setlocal()

  # Set /etc/hosts
  sethostsfile()

  # Throw the hostname in /etc/sysconfig/httpd (if exists)
  givetohttpd()

  # All done
  finish!()
end