Class: Commands::DeleteInstances

Inherits:
Object
  • Object
show all
Defined in:
lib/commands/delete_instances.rb

Instance Method Summary collapse

Instance Method Details

#options ⇒ Object

holds the options that were passed you can set any initial defaults here



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# File 'lib/commands/delete_instances.rb', line 7

def options
  @options ||= {
      :force_delete => false
  }
end

#register(opts, global_options) ⇒ Object 



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# File 'lib/commands/delete_instances.rb', line 21

def register(opts, global_options)
  opts.banner = "Usage: delete [options]"
  opts.description = "Delete server instance(s)"

  opts.on('-i', "--instance instance1,instance2,etc", Array, "The instance(s) to delete.") do |v|
    options[:instances] = v
  end

  opts.on('-g', "--group deploy_group", "Required - The deploy group we are in.  A deploy group is a set of servers that are required to run the infrastructure for a server.") do |v|
    options[:group] = v
  end

  opts.on('-f', "--force", "Force a deletion of a restricted app type (such as db or app_master).  App will most likely fail to operate properly after this.") do |v|
    options[:force_delete] = v
  end

  opts.on('-w', "--wait", "Wait until the instance has completely shut down and terminated.  Otherwise, we return immediately after starting the terminate.") do |v|
    options[:wait] = v
  end

  opts.on('-p', "--print path", "The directory into which we output the data as a file per host.") do |v|
    options[:result_path] = v
  end
end

#required_options ⇒ Object

required options



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# File 'lib/commands/delete_instances.rb', line 14

def required_options
  @required_options ||= Set.new [
      :instances,
      :group
  ]
end

#run(global_options, amazon) ⇒ Object 



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# File 'lib/commands/delete_instances.rb', line 47

def run(global_options, amazon)
  ec2 = amazon.ec2
  elb = amazon.elb
  utils = ZZSharedLib::Utils.new(amazon)

  group_name = options[:group]
  deploy_group = amazon.find_deploy_group(group_name)
  group_config = deploy_group.config
  amazon_elb = group_config[:amazon_elb]

  inst_ids = options[:instances]
  if options[:force_delete] == false
    # check to see if restricted type
    inst_ids.each do |inst_id|
      flat = amazon.flat_tags_for_resource(inst_id)
      role = flat[:role]
      role = role.to_sym unless role.nil?
      case role
        when :app_master, :db
          raise "You cannot delete an instance with a role of #{role}.  Doing so will cause the server to not operate.  You can force with the --force option."
      end
    end
  end


  amazon.flush_tags    # force a refresh of the cached tags
  all_instances = amazon.find_and_sort_named_instances(group_name)

  instances = all_instances.reject { |inst| inst_ids.include?(inst[:resource_id]) == false }

  # call servers to perform clean shutdown
  puts "Attempting to perform clean shutdown on remote machines.  Will ignore any errors and continue with shutdown."
  BuildDeployConfig.do_remote_shutdown(utils, amazon, instances, group_name, deploy_group, options[:result_path]) rescue nil

  # mark state on machines as deleted
  ec2.create_tags(inst_ids, {:state => 'delete' })

  # now shut them down
  ec2.terminate_instances([inst_ids])
  inst_ids.each do |inst_id|
    puts "Instance #{inst_id} is terminating."
  end
  if options[:wait] == true
    puts "Waiting for instances to terminate."
    while true do
      print "."
      STDOUT.flush
      sleep(1)
      instances = ec2.describe_instances(inst_ids)
      all_terminated = true
      instances.each do |instance|
        if instance[:aws_state] != "terminated"
          all_terminated = false
          break
        end
      end
      break if all_terminated
    end
  end

  # we may want to kick off a redeploy of the chef config and app since the configuration of the
  # group changed.  Right now we leave this up to the caller since they may want to do it after
  # deleting more than one instance to avoid multiple redeploys
  puts
  puts "Since the configuration has changed you should redeploy the configuration and application using chef_bake and deploy."
end