Class: AWS::Autoscale

Inherits:
Object
  • Object
show all
Includes:
Utils
Defined in:
lib/conan/cloud/aws/autoscale.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Utils

#all_availability_zones, #all_regions, #default_availability_zone, #default_image_id, #ec2_name_tag, #elasticache_name_tag, #find_server_by_name, #list_stage_servers, #rds_name_tag

Constructor Details

#initialize(stage = 'production', autoscale_config = {}, application = nil) ⇒ Autoscale

Returns a new instance of Autoscale.



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# File 'lib/conan/cloud/aws/autoscale.rb', line 13

def initialize(stage = 'production', autoscale_config = {}, application = nil)
  @autoscale_config = autoscale_config
  @stage = stage
  @application = application
end

Instance Attribute Details

#application ⇒ Object

Returns the value of attribute application.



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# File 'lib/conan/cloud/aws/autoscale.rb', line 11

def application
  @application
end

#autoscale_config ⇒ Object

Returns the value of attribute autoscale_config.



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# File 'lib/conan/cloud/aws/autoscale.rb', line 11

def autoscale_config
  @autoscale_config
end

#stage ⇒ Object

Returns the value of attribute stage.



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# File 'lib/conan/cloud/aws/autoscale.rb', line 11

def stage
  @stage
end

Instance Method Details

#configure_autoscale ⇒ Object 



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# File 'lib/conan/cloud/aws/autoscale.rb', line 91

def configure_autoscale
end

#create_ami_from_server(server_name, region, image_description = nil) ⇒ Object 



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# File 'lib/conan/cloud/aws/autoscale.rb', line 19

def create_ami_from_server(server_name, region, image_description = nil)
  image_name = "#{server_name}-image-#{Time.now.strftime('%Y%m%d%H%M')}" if image_name.nil?
  image_description = "Image of #{server_name} created at #{DateTime.now} by conan"
  server_to_image = find_server_by_name(server_name, region)

  raise "Server #{server_name} in #{region} does not exist" if server_to_image.nil?

  compute = Fog::Compute.new(:provider => :aws, :region => region)
  puts "Creating image #{image_name} from server #{server_name}"
  ami_request = compute.create_image(server_to_image.id, image_name, image_description)
  image_id = ami_request.body["imageId"]

  pending = true
  image = nil

  puts "Waiting for #{image_id} to become available"
  while pending 
    sleep 10
    image = compute.images.get(image_id)
    pending = image.state == "pending"
  end

  raise "Image creation failed" if image.state == 'failed'
  image_id

end

#create_launch_config(name, config = {}) ⇒ Object 



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# File 'lib/conan/cloud/aws/autoscale.rb', line 46

def create_launch_config(name, config = {})
  new_conf = config.inject({}){|memo,(k,v)| memo[k.to_sym] = v; memo}
  region = new_conf[:region] || "us-east-1"

  compute = Fog::Compute.new(:provider => :aws, :region => region)

  params = {}
  params['KeyName'] = new_conf[:key_name] || compute.key_pairs.all.first.name

  if new_conf[:security_groups] and new_conf[:security_groups].size > 0
    params['SecurityGroups'] = new_conf[:security_groups].collect { |g| "#{stage}-#{g}" }
  else
    params['SecurityGroups'] = ["#{stage}-default"]
  end

  instance_type = new_conf.delete(:instance_type) || "m1.small"

  if new_conf[:server_to_image].nil?
    if new_conf[:image_id].nil?
      image_id = default_image_id(region, instance_type, new_conf[:root_device_type]) 
    else
      image_id = new_conf[:image_id]
    end
  else
    image_id = create_ami_from_server(new_conf[:server_to_image], region)
  end

  autoscale = Fog::AWS::AutoScaling.new(:region => region)

  #need to create new launchconfiugrations with unique names
  #because you can't modify them and you can't delete them if they are attached
  #to an autoscale group
  id = "#{ec2_name_tag(name)}-#{Time.now.strftime('%Y%m%d%H%M')}"

  puts "Creating Autoscale Launch Configuration #{id}"
  lc = autoscale.configurations.connection.create_launch_configuration(image_id, instance_type, id, params)

  new_conf[:autoscale_groups].each do |group_name|
    asg = autoscale.groups.get(group_name)
    puts "Setting Autoscale Group #{group_name} to use Launch Configration #{id}"
    asg.connection.update_auto_scaling_group(group_name, {"LaunchConfigurationName" => id})
  end unless new_conf[:autoscale_groups].nil?

end

#launch_test_instances ⇒ Object 



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# File 'lib/conan/cloud/aws/autoscale.rb', line 105

def launch_test_instances
  autoscale_config.each do |type, resources|
     case type
     when "launch-config"
       resources.each do |name, conf|
         start_test_server(name, conf)
       end
     end
  end
end

#start_test_server(name, config = {}) ⇒ Object 



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# File 'lib/conan/cloud/aws/autoscale.rb', line 116

def start_test_server(name, config = {})
  new_conf = config.inject({}){|memo,(k,v)| memo[k.to_sym] = v; memo}
  region = new_conf[:region] || "us-east-1"

  compute = Fog::Compute.new(:provider => :aws, :region => region)

  autoscale = Fog::AWS::AutoScaling.new(:region => region)
  asres = autoscale.describe_auto_scaling_groups({'AutoScalingGroupNames' => new_conf[:autoscale_groups]})
  lcname = ""
  #so aws APIs sometimes return a blank scaling group????? need to check if there is a LC
  asres.body["DescribeAutoScalingGroupsResult"]["AutoScalingGroups"].each do |asgroup|
    lcname = asgroup["LaunchConfigurationName"]
    break if !lcname.nil? && lcname.length > 0
  end

  lcres = autoscale.describe_launch_configurations({'LaunchConfigurationNames' => [lcname]})
  lc = lcres.body["DescribeLaunchConfigurationsResult"]["LaunchConfigurations"][0]

  compute = Fog::Compute.new(:provider => :aws, :region => region)
  server_params = {}
  server_params[:groups] = lc["SecurityGroups"]
  server_params[:key_name] = lc["KeyName"]
  server_params[:image_id] = lc["ImageId"]
  server_params[:monitoring] = false
  server_params[:flavor_id] = lc["InstanceType"]
  server_params[:root_device_type] = "ebs"
  server_params[:availability_zone] = default_availability_zone(region)


  puts "Creating test instance from image for launch configuration #{lcname}"
  server = compute.servers.create(server_params)
  server.wait_for { ready? }

  puts "Created server #{server.dns_name} for testing. Please delete manually"

end

#update_autoscale ⇒ Object 



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# File 'lib/conan/cloud/aws/autoscale.rb', line 94

def update_autoscale
  autoscale_config.each do |type, resources|
     case type
     when "launch-config"
       resources.each do |name, conf|
         create_launch_config(name, conf)
       end
     end
  end
end