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3-lc-sg-lambda.py
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3-lc-sg-lambda.py
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from __future__ import print_function
import json
import datetime
import time
import boto3
AUTO_SCALLING_GROUP = 'Hayes-Test-ASG'
LC_1 = 'LC-micro'
LC_2 = 'LC-Large'
print('Loading function')
def lambda_handler(event, context):
print("Received event: " + json.dumps(event, indent=2))
# get autoscaling client
client = boto3.client('autoscaling')
# get object for the ASG we're going to update, filter by name of target ASG
response = client.describe_auto_scaling_groups(AutoScalingGroupNames=[event[AUTO_SCALLING_GROUP]])
if not response['AutoScalingGroups']:
return 'No such ASG'
# update ASG to use new LC
if response.get('AutoScalingGroups')[0]['LaunchConfigurationName'] == LC_1:
client.update_auto_scaling_group(AutoScalingGroupName=AUTO_SCALLING_GROUP, LaunchConfigurationName=LC_2)
else:
client.update_auto_scaling_group(AutoScalingGroupName=AUTO_SCALLING_GROUP, LaunchConfigurationName=LC_1)
response = client.describe_auto_scaling_groups(AutoScalingGroupNames=[AUTO_SCALLING_GROUP])
newLaunchConfigName = response.get('AutoScalingGroups')[0]['LaunchConfigurationName']
return 'Updated ASG `%s` with new launch configuration `%s`' % (event['targetASG'], newLaunchConfigName)