Class: Cumulus::EC2::InstanceManager

Inherits:
Common::Manager show all
Defined in:
lib/ec2/managers/InstanceManager.rb

Instance Method Summary collapse

Methods inherited from Common::Manager

#diff, #diff_one, #filter_local, #list, #sync, #sync_one

Constructor Details

#initialize ⇒ InstanceManager

Returns a new instance of InstanceManager.



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# File 'lib/ec2/managers/InstanceManager.rb', line 18

def initialize
  super()
  @create_asset = true
  @client = Aws::EC2::Client.new(Configuration.instance.client)
  @device_name_base = Configuration.instance.ec2.volume_mount_base
  @device_name_start = Configuration.instance.ec2.volume_mount_start
  @device_name_end = Configuration.instance.ec2.volume_mount_end
end

Instance Method Details

#added_diff(local) ⇒ Object 



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# File 'lib/ec2/managers/InstanceManager.rb', line 46

def added_diff(local)
  InstanceDiff.added(local)
end

#aws_resources ⇒ Object 



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# File 'lib/ec2/managers/InstanceManager.rb', line 35

def aws_resources
  @aws_resources ||=
    EC2::named_instances
      .reject { |name, i| AutoScaling::instance_ids.include?(i.instance_id) }
      .select { |name, i| !Configuration.instance.ec2.ignore_unmanaged_instances || local_resources.has_key?(name) }
end

#create(local) ⇒ Object 



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# File 'lib/ec2/managers/InstanceManager.rb', line 106

def create(local)
  #######################################
  # Make sure required attributes are set
  #######################################

  # Check for image
  errors = []
  image_id = local.image || Configuration.instance.ec2.default_image_id
  if image_id.nil?
    errors << "image is required"
  end

  # Check for IAM profile
  profile_arn = if local.profile.nil?
    errors << "profile is required"
    nil
  else
    arn = IAM::get_instance_profile_arn(local.profile)
    if arn.nil?
      errors << "no profile named #{local.profile} exists"
    end
    arn
  end

  # Check for security groups
  if local.security_groups.empty?
    errors << "security-groups is required"
  end

  # Check for subnet
  if local.subnet.nil?
    errors << "subnet is required"
  end

  aws_subnet = EC2::named_subnets[local.subnet]
  if aws_subnet.nil?
    errors << "subnet #{local.subnet} does not exist"
  end

  # Get the vpc id from the subnet
  vpc_id = aws_subnet.vpc_id

  security_group_ids = local.security_groups.map do |sg|
    sg_id = SecurityGroups.vpc_security_group_id_names[vpc_id].key(sg)
    if sg_id.nil?
      errors << "security group #{sg} does not exist"
    end
    sg_id
  end

  # Check for type
  if local.type.nil?
    errors << "type is required"
  end

  # Make sure the placement group exists
  if !local.placement_group.nil? and EC2::named_placement_groups[local.placement_group].nil?
    errors << "placement group #{local.placement_group} does not exist"
  end

  availability_zone = if aws_subnet then aws_subnet.availability_zone end

  # Check for volume groups
  volumes = if !local.volume_groups.empty?
    # Try to get the volumes for each volume group, make sure they are in the right AZ
    local.volume_groups.map do |vg|
      vols = EC2::group_ebs_volumes_aws[vg]
      if vols.nil?
        errors << "volume group #{vg} does not exist"
      elsif vols.empty?
        errors << "could not find volumes for group #{vg}"
      else
        if availability_zone and vols.any? { |vol| vol.availability_zone != availability_zone }
          errors << "not all volumes in #{vg} are in the correct availability zone: #{availability_zone}"
        end
      end
      vols
    end.flatten
  else
    puts "Warning: Only the root volume will be attached to the instance"
    []
  end

  # Make sure there are not more volumes than device names for volumes
  if (@device_name_end.ord - @device_name_start.ord + 1) < volumes.length
    errors << "cannot attach more volumes than there are names for between #{@device_name_base}#{@device_name_start} and #{@device_name_base}#{@device_name_end}"
  end

  if !errors.empty?
    puts "Could not create #{local.name}:"
    errors.each { |e| puts "\t#{e}"}
    exit StatusCodes::EXCEPTION
  end

  created_instance = @client.run_instances({
    image_id: image_id,
    min_count: 1,
    max_count: 1,
    key_name: local.key_name,
    security_group_ids: if local.network_interfaces == 0 then security_group_ids end,
    user_data: if local.user_data then Base64.encode64(InstanceLoader.user_data(local.user_data)) end,
    instance_type: local.type,
    subnet_id: if local.network_interfaces == 0 then aws_subnet.subnet_id end,
    placement: {
      availability_zone: availability_zone,
      group_name: local.placement_group,
      tenancy: local.tenancy,
    },
    monitoring: {
      enabled: local.monitoring
    },
    private_ip_address: if local.network_interfaces == 0 then local.private_ip_address end,
    network_interfaces: Array.new(local.network_interfaces) do |index|
      {
        subnet_id: aws_subnet.subnet_id,
        groups: security_group_ids,
        delete_on_termination: true,
        device_index: index,
        private_ip_addresses: if local.network_interfaces == 1 and local.private_ip_address
          [
            {
              private_ip_address: local.private_ip_address,
              primary: true
            }
          ]
        end
      }
    end,
    iam_instance_profile: {
      arn: profile_arn
    },
    ebs_optimized: local.ebs_optimized
  }).instances.first

  # Wait until the instance is running then attach volumes
  print "Waiting for instance to run"
  @client.wait_until(:instance_running, {
    instance_ids: [created_instance.instance_id]
  }) do |waiter|
    waiter.before_wait { print "." }
  end
  puts ""

  if !local.tags.empty?
    set_tags(created_instance.instance_id, local.tags)
  end
  set_name(created_instance.instance_id, local.name)

  if created_instance.source_dest_check != local.source_dest_check
    set_instance_source_dest_check(created_instance.instance_id, local.source_dest_check)
  end

  # If there are multiple network interfaces, source dest check must be set on each one
  if created_instance.network_interfaces.length > 1
    created_instance.network_interfaces.each do |interface|
      set_interface_source_dest_check(interface.network_interface_id, local.source_dest_check)
    end
  else
    set_instance_source_dest_check(created_instance.instance_id, local.source_dest_check)
  end

  # Attach volume groups
  attach_volumes(created_instance.instance_id, volumes, @device_name_start)

end

#diff_resource(local, aws) ⇒ Object 



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# File 'lib/ec2/managers/InstanceManager.rb', line 50

def diff_resource(local, aws)
  puts Colors.blue("Processing #{local.name}...")
  instance_attributes = EC2::id_instance_attributes(aws.instance_id)
  user_data_file = InstanceLoader.user_data_base64.key(instance_attributes.user_data)
  cumulus_version = InstanceConfig.new(local.name).populate!(aws, user_data_file, instance_attributes.tags)

  local.diff(cumulus_version)
end

#local_resources ⇒ Object 



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# File 'lib/ec2/managers/InstanceManager.rb', line 31

def local_resources
  @local_resources ||= Hash[InstanceLoader.instances.map { |local| [local.name, local] }]
end

#migrate ⇒ Object 



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# File 'lib/ec2/managers/InstanceManager.rb', line 59

def migrate
  puts Colors.blue("Migrating Instances...")

  # Create the directories
  ec2_dir = "#{@migration_root}/ec2"
  instances_dir = "#{ec2_dir}/instances"
  user_data_dir = "#{ec2_dir}/user-data-scripts"

  if !Dir.exists?(@migration_root)
    Dir.mkdir(@migration_root)
  end
  if !Dir.exists?(ec2_dir)
    Dir.mkdir(ec2_dir)
  end
  if !Dir.exists?(instances_dir)
    Dir.mkdir(instances_dir)
  end
  if !Dir.exists?(user_data_dir)
    Dir.mkdir(user_data_dir)
  end

  # Only migrate instances not in an autoscaling group
  migratable_instances = EC2::named_instances.reject { |name, i| AutoScaling::instance_ids.include?(i.instance_id) }
  puts "Will migrate #{migratable_instances.length} instances"

  migratable_instances.each do |name, instance|
    puts "Migrating #{name}..."

    instance_attributes = EC2::id_instance_attributes(instance.instance_id)

    # If there was user data set, migrate that too
    if instance_attributes.user_data
      user_data_file = "#{name}.sh"
      file_location = "#{user_data_dir}/#{user_data_file}"
      puts "Migrating user data script to #{file_location}"
      file_contents = Base64.decode64(instance_attributes.user_data)
      File.open(file_location, "w") { |f| f.write(file_contents) }
    end

    cumulus_instance = InstanceConfig.new(name).populate!(instance, user_data_file, instance_attributes.tags)

    json = JSON.pretty_generate(cumulus_instance.to_hash)
    File.open("#{instances_dir}/#{name}.json", "w") { |f| f.write(json) }
  end

end

#resource_name ⇒ Object 



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# File 'lib/ec2/managers/InstanceManager.rb', line 27

def resource_name
  "EC2 Instance"
end

#unmanaged_diff(aws) ⇒ Object 



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# File 'lib/ec2/managers/InstanceManager.rb', line 42

def unmanaged_diff(aws)
  InstanceDiff.unmanaged(aws)
end

#update(local, diffs) ⇒ Object 



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# File 'lib/ec2/managers/InstanceManager.rb', line 272

def update(local, diffs)
  aws_instance = EC2::named_instances[local.name]

  diffs.each do |diff|
    case diff.type
    when  InstanceChange::PROFILE,
          InstanceChange::SUBNET,
          InstanceChange::TYPE,
          InstanceChange::TENANCY

      puts Colors.red("Cannot change #{diff.asset_type}")
    when InstanceChange::EBS
      if !aws_instance.stopped?
        puts Colors.red("Cannot update EBS Optimized unless the instance is stopped")
      else
        puts "Setting EBS Optimized to #{local.ebs_optimized}..."
        set_ebs_optimized(aws_instance.instance_id, local.ebs_optimized)
      end
    when InstanceChange::MONITORING
      if local.monitoring
        puts "Enabling monitoring..."
        set_monitoring(aws_instance.instance_id, true)
      else
        puts "Disabling monitoring..."
        set_monitoring(aws_instance.instance_id, false)
      end
    when InstanceChange::SECURITY_GROUPS
      puts "Updating Security Groups..."

      # If there are multiple network interfaces, security groups must be set on each one
      if aws_instance.network_interfaces.length > 1
        aws_instance.network_interfaces.each do |interface|
          set_interface_security_groups(aws_instance.vpc_id, interface.network_interface_id, local.security_groups)
        end
      else
        set_instance_security_groups(aws_instance.vpc_id, aws_instance.instance_id, local.security_groups)
      end

    when InstanceChange::SDCHECK
      puts "Setting Source Dest Check to #{local.source_dest_check}..."

      # If there are multiple network interfaces, source dest check must be set on each one
      if aws_instance.network_interfaces.length > 1
        aws_instance.network_interfaces.each do |interface|
          set_interface_source_dest_check(interface.network_interface_id, local.source_dest_check)
        end
      else
        set_instance_source_dest_check(aws_instance.instance_id, local.source_dest_check)
      end
    when InstanceChange::INTERFACES
      if diff.aws > diff.local
        puts Colors.red("Cumulus will not detach or delete network interfaces. You must do so manually and update the config")
      else
        # Figure out highest device index for current interfaces
        highest_device_index = (aws_instance.network_interfaces.map(&:attachment).map(&:device_index).max || 0) + 1

        (diff.local - diff.aws).times do |i|
          puts "Creating network interface..."
          interface_id = create_network_interface(aws_instance.vpc_id, aws_instance.subnet_id, local.security_groups)
          set_interface_source_dest_check(interface_id, local.source_dest_check)

          puts "Attaching network interface..."
          attachment_id = attach_network_interface(aws_instance.instance_id, interface_id, highest_device_index + i)
          set_delete_on_terminate(interface_id, attachment_id)
        end
      end
    when InstanceChange::VOLUME_GROUPS
      # Figure out the highest device name for already attached volumes
      last_device_name = aws_instance.nonroot_devices.map(&:device_name).sort.last
      start_attaching_at = if last_device_name then (last_device_name[-1].ord + 1).chr else @start_device_letter end

      # Figure out which volumes in the group are not attached
      volumes_to_attach = diff.local.map { |group_name, group_config| EC2::group_ebs_volumes_aws[group_name] }.flatten.select(&:detached?)

      # Make sure there are not more volumes than device names for volumes
      if start_attaching_at.ord > @device_name_end.ord
        puts Colors.red("Cannot attach volumes past #{@device_name_base}#{@device_name_end}")
      elsif (@device_name_end.ord - start_attaching_at.ord + 1) < volumes_to_attach.length
        puts Colors.red("Cannot attach more volumes than there are names for between #{@device_name_base}#{start_attaching_at} and #{@device_name_base}#{@device_name_end}")
      else
        attach_volumes(aws_instance.instance_id, volumes_to_attach, start_attaching_at)
      end
    when InstanceChange::TAGS
      puts "Updating tags..."

      if !diff.tags_to_remove.empty?
        delete_tags(aws_instance.instance_id, diff.tags_to_remove)
      end

      if !diff.tags_to_add.empty?
        set_tags(aws_instance.instance_id, diff.tags_to_add)
      end

    end
  end
end