nts.cfn.php

nts.cfn.php

<?php

include_once "../cfn-generator.php";

/**
* The template generation often does not have to be complete.  The create_template() 
* function applies inpwrd-specific policy optimizations, which may be influenced by
* the NS: key prefix hints.  For example:
*
* == Launch Configuration ==
* - ImageID is latest Amazon Linux AMI.  Defaults to EBS backed.  Picks S3-backed if
    NS:EBS = false.
* - Dev and QA are spot unless specified otherwise (NS:ISSpot = false)
* - If spot, bid price is set to the on-demand cost.
* - If no IAM Profile is set, the generic environment one is selected.
* - User data is created from NS:Name (project name for finding bootstrap file on S3).
* - Set the keyname to environment.
*
* == Auto Scaling Groups ===
* - If there is a load balancer or we are launching on-demand, AZs A+B are selected.  Otherwise 
*   all AZs are selected to increase spot availability.
*
* == Load Balancers ==
* - Default to AZs A+B.

* == Security Groups ===
* - Description is automatically created as a summary of ports opened.
* - Automatically adds bouncebox-global SOURCE to any SG created.
* - NS:DefaultSecurityPolicy is replaced by a standard config for a specific port.

*/


if (count($_SERVER['argv'])!=2) {
  die("Usage:\nphp ".$_SERVER['argv'][0]." {dev,qa,prd} > stack.json\ncfn-update-stack [stack-name] --template-file stack.json\n");
}

$environment = preg_replace("/[0-9]/", "", $_SERVER['argv'][1]);

print create_template($environment, array(
	'Description' => "nts stack",
	'Resources' => array(
		'ntstaggerASG' => array(
			'Type' => 'AWS::AutoScaling::AutoScalingGroup',
			'Properties' => array(
				'LaunchConfigurationName' => array('Ref' => 'ntstaggerLC'),
				'MaxSize' => ($environment=='prd' ? 15 : 1),
				'MinSize' => ($environment=='prd' ? 2 : 1),
				'LoadBalancerNames' => array(
					array('Ref' => 'ntstaggerELB')
				),
			)
		),
		'ntstaggerLC' => array(
			'Type' => 'AWS::AutoScaling::LaunchConfiguration',
			'Properties' => array(
				'InstanceType' => 'c1.xlarge',
				'SecurityGroups' => array(
					array('Ref' => 'ntstaggerSG'),
					"ntsdb-$environment"
				),
				'NS:Name' => 'ntstagger',
			)
		),
		'ntstaggerELB' => array(
			'Type' => 'AWS::ElasticLoadBalancing::LoadBalancer',
			"Properties" => array(
				'Listeners' => array(
					array(
						"LoadBalancerPort" 	=> "8080",
						"InstancePort" 		=> "8080",
						"Protocol" 			=> "HTTP",
					)
				),
				"HealthCheck" => array(
					"Target"			=> "HTTP:8080/new-nts/health-check",
					"HealthyThreshold" 	=> "5",
					"UnhealthyThreshold"=> "2",
					"Interval" 			=> "10",
					"Timeout" 			=> "8"
				)
			)
		),
		'ntstaggerSG' => array(
			"Type" => 'AWS::EC2::SecurityGroup',
			"Properties" => array(
				'SecurityGroupIngress' => array(
					array(
						"IpProtocol" => "tcp",
						"FromPort" => "8080",
						"ToPort" => "8080",
						"SourceSecurityGroupName" => "amazon-elb-sg",
						"SourceSecurityGroupOwnerId" => "amazon-elb"
 					)
				)
			)
		),
		
/* Copied Auto Scaling rules below from previous nts.prd1.json file */
		"ntstaggerScaleUpQty1" => array(
			"Properties" => array(
				"AdjustmentType" => "ChangeInCapacity",
				"AutoScalingGroupName" => array(
					"Ref" => "ntstaggerASG"
				),
				"ScalingAdjustment" => "1"
			),
			"Type" => "AWS::AutoScaling::ScalingPolicy"
		),
		"ntstaggerScaleUpQty2" => array(
			"Properties" => array(
				"AdjustmentType" => "ChangeInCapacity",
				"AutoScalingGroupName" => array(
					"Ref" => "ntstaggerASG"
				),
				"ScalingAdjustment" => "2"
			),
			"Type" => "AWS::AutoScaling::ScalingPolicy"
		),
		"ntstaggerScaleDownQty1" => array(
			"Properties" => array(
				"AdjustmentType" => "ChangeInCapacity",
				"AutoScalingGroupName" => array(
					"Ref" => "ntstaggerASG"
				),
				"ScalingAdjustment" => "-1"
			),
			"Type" => "AWS::AutoScaling::ScalingPolicy"
		),

/* Not clear on the syntax or what to use for the AlarmActions json array... 
comparing with targeting.cfn.php however for alarm actions variables are used */	
		"ntstaggerNumberOfIncomingMessagesHigh" => array(
			"Properties" => array(
				"AlarmActions" => array(
					"Ref" => "ntstaggerScaleUpQty1"
				),
				"AlarmDescription" => "ntstaggerIncomingMessagesHigh",
				"ComparisonOperator" => "GreaterThanThreshold",
				"Dimensions" => array(
					"Name" => "Totals",
					"Value" => "NS/PRD/NTS"
				),
				"EvaluationPeriods" => "1",
				"MetricName" => "ApproximateNumberOfMessagesBothQueues",
				"Namespace" => "NS/PRD/NTS",
				"Period" => "900",
				"Statistic" => "Average",
				"Threshold" => "1000"
			),
			"Type" => "AWS::CloudWatch::Alarm"
		),
		"ntstaggerNumberOfIncomingMessagesVeryHigh" => array(
			"Properties" => array(
				"AlarmActions" => array(
					"Ref" => "WarningTopic"
				), (
/* There's an issue with the line below. Not sure why. */
					array("Ref" => "ntstaggerScaleUpQty2")
				),
				"AlarmDescription" => "ntstaggerIncomingMessagesVeryHigh",
				"ComparisonOperator" => "GreaterThanThreshold",
				"Dimensions" => array(
					"Name" => "Totals",
					"Value" => "NS/PRD/NTS"
				),
				"EvaluationPeriods" => "1",
				"MetricName" => "ApproximateNumberOfMessagesBothQueues",
				"Namespace" => "NS/PRD/NTS",
				"Period" => "900",
				"Statistic" => "Average",
				"Threshold" => "10000"
			),
			"Type" => "AWS::CloudWatch::Alarm"
		),
		"ntstaggerNumberOfIncomingMessagesCritical" => array(
			"Properties" => array(
				"AlarmActions" => array(
					"Ref" => "CriticalTopic"
				),
				"AlarmDescription" => "ntstaggerIncomingMessagesCritical",
				"ComparisonOperator" => "GreaterThanThreshold",
				"Dimensions" => array(
					"Name" => "Totals",
					"Value" => "NS/PRD/NTS"
				),
				"EvaluationPeriods" => "1",
				"MetricName" => "ApproximateNumberOfMessagesBothQueues",
				"Namespace" => "NS/PRD/NTS",
				"Period" => "900",
				"Statistic" => "Average",
				"Threshold" => "100000"
			),
			"Type" => "AWS::CloudWatch::Alarm"
		),
		"ntstaggerNumberOfIncomingMessagesOK" => array(
			"Properties" => array(
				"AlarmActions" => array(
					"Ref" => "ntstaggerScaleDownQty1"
				),
				"AlarmDescription" => "ntstaggerIncomingMessagesOK",
				"ComparisonOperator" => "LessThanThreshold",
				"Dimensions" => array(
					"Name" => "Totals",
					"Value" => "NS/PRD/NTS"
				),
				"EvaluationPeriods" => "1",
				"MetricName" => "ApproximateNumberOfMessagesBothQueues",
				"Namespace" => "NS/PRD/NTS",
				"Period" => "900",
				"Statistic" => "Average",
				"Threshold" => "1000"
			),
			"Type" => "AWS::CloudWatch::Alarm"
		),
		"ntstaggerNumberOfIncomingMessagesZero" => array(
			"Properties" => array(
				"AlarmActions" => array(
					"Ref" => "CriticalTopic"
				),
				"AlarmDescription" => "ntstaggerIncomingMessagesEmpty",
				"ComparisonOperator" => "LessThanThreshold",
				"Dimensions" => array(
					"Name" => "Totals",
					"Value" => "NS/PRD/NTS"
				),
				"EvaluationPeriods" => "1",
				"MetricName" => "ApproximateNumberOfMessagesBothQueues",
				"Namespace" => "NS/PRD/NTS",
				"Period" => "900",
				"Statistic" => "Maximum",
				"Threshold" => "0"
			),
			"Type" => "AWS::CloudWatch::Alarm"
		),
		"Outputs" => array(
		"ntstaggerURL" => array(
			"Description" => "URL for the FrontEnd NTS service",
			"Value" => array(
				"Fn::GetAtt" => array("ntstaggerELB", "DNSName")
			)
		)
	)
	) 
));
?>