autoscaling

autoscaling.py

@@ -271,11 +271,11 @@ def put_scaling_policies(autoscaling_client, asg_arn):
         PolicyName=f"{PREFIX}-scale-policy-up",
         PolicyType='SimpleScaling',
         AdjustmentType='ChangeInCapacity',
-        ScalingAdjustment=1,
-        Cooldown=60
+        ScalingAdjustment=2,  # Scale up faster by adding 2 instances at a time
+        Cooldown=30  # Short cooldown for rapid scaling up
     )
 
-    print(f"Scale policy created with ARN: {up['PolicyARN']}")
+    print(f"Scale-up policy created with ARN: {up['PolicyARN']}")
 
     # Put Scaling Policy Down
     down = autoscaling_client.put_scaling_policy(
@@ -283,27 +283,27 @@ def put_scaling_policies(autoscaling_client, asg_arn):
         PolicyName=f"{PREFIX}-scale-policy-down",
         PolicyType='SimpleScaling',
         AdjustmentType='ChangeInCapacity',
-        ScalingAdjustment=-1,
-        Cooldown=60
+        ScalingAdjustment=-1,  # Scale down slower by removing 1 instance at a time
+        Cooldown=120  # Longer cooldown for scaling down
     )
 
-    print(f"Scale policy created with ARN: {down['PolicyARN']}")
+    print(f"Scale-down policy created with ARN: {down['PolicyARN']}")
     return up['PolicyARN'], down['PolicyARN']
 
 def create_cloudwatch_alarms(cloudwatch_client, sp_up, sp_down):
-    # Create CloudWatch Alarms
+    # Create CloudWatch Alarms for scaling up
     cloudwatch_client.put_metric_alarm(
-        AlarmName=f"{PREFIX}-scale-alarm",
+        AlarmName=f"{PREFIX}-scale-up-alarm",
         ComparisonOperator='GreaterThanThreshold',
         EvaluationPeriods=1,
         MetricName='RequestCountPerTarget',
         Namespace='AWS/ApplicationELB',
-        Period=60,
-        Statistic='Sum',
-        Threshold=50,
+        Period=30,  # Short evaluation period for quick scaling up
+        Statistic='Average',
+        Threshold=50,  # Lower threshold for scaling up faster
         ActionsEnabled=True,
         AlarmActions=[sp_up],
-        AlarmDescription='Scale-up',
+        AlarmDescription='Scale-up alarm',
         Dimensions=[{
             'Name': 'AutoScalingGroupName',
             'Value': f"{PREFIX}-asg"
@@ -313,16 +313,16 @@ def create_cloudwatch_alarms(cloudwatch_client, sp_up, sp_down):
 
     print(f"Scale-up alarm created")
 
-    # Scale-down alarm
+    # Create CloudWatch Alarms for scaling down
     cloudwatch_client.put_metric_alarm(
         AlarmName=f"{PREFIX}-scale-down-alarm",
         ComparisonOperator='LessThanThreshold',
-        EvaluationPeriods=1,
+        EvaluationPeriods=2,  # Longer evaluation period for slower scaling down
         MetricName='RequestCountPerTarget',
         Namespace='AWS/ApplicationELB',
-        Period=60,
+        Period=120,  # Longer period to prevent frequent scale-down actions
         Statistic='Average',
-        Threshold=10,
+        Threshold=10,  # Higher threshold to delay scaling down
         ActionsEnabled=True,
         AlarmActions=[sp_down],
         AlarmDescription='Scale-down alarm',