We did follow the guide as per your link. but somehow rather its cant work. below is our lambda script import boto3 import json # Change this to be the same as the region you are using region='ap-southeast-1' ec2 = boto3.resource('ec2',region_name=region) cloudwatch = boto3.resource('cloudwatch',region_name=region) client = boto3.client('ec2',region_name=region) def change_subnet_routetable(subnetID,rtID): response = client.describe_route_tables( Filters=[{'Name': 'association.subnet-id','Values': [subnetID]}] ) rtaID=response['RouteTables'][0]['Associations'][0]['RouteTableAssociationId'] ec2.RouteTableAssociation(rtaID).replace_subnet(RouteTableId=rtID) def lambda_handler(event, context): # Change this to be the instance ID of VMX-1A vmx1a = ec2.Instance('i-0a1afe42842357215') # Create detailed monitoring for vmx1a in 1 minute interval, VMX-1A-STATUS-CHECK is the name of the cloudwatch alarm config of vMX-1A vmx1aalarm = cloudwatch.Alarm('VMX-1A-STATUS-CHECK') # Change this to be the instance ID of VMX-1B - If setup no load balancing then no need check vMX-1B #vmx1b = ec2.Instance('i-05d0aa2e92b6bf890') # Create detailed monitoring for vmx1b in 1 minute interval #vmx1balarm = cloudwatch.Alarm('VMX-1B-STATUS-CHECK') if vmx1a.state['Name']=="running" and vmx1aalarm.state_value=='OK': print("VMX1A UP") # Add one of these lines for every subnet you have. Change "rtb" to be the ID for the route table VMX-1A-UP # DEV private subnets change_subnet_routetable('subnet-0f06b39deb3a6a0bc','rtb-02c9f6a6f60bd36e4') change_subnet_routetable('subnet-08104babe83ad85d3','rtb-02c9f6a6f60bd36e4') change_subnet_routetable('subnet-00d984b9423f807db','rtb-02c9f6a6f60bd36e4') # DEV public subnets change_subnet_routetable('subnet-0783ca3c2a9a1fa87','rtb-070257ae8030b52c0') change_subnet_routetable('subnet-01a0bd7312b9bd17f','rtb-070257ae8030b52c0') change_subnet_routetable('subnet-0af94494946901b21','rtb-070257ae8030b52c0') else: print("VMX1A DOWN") # Add one of these lines for every subnet you have. Change "rtb" to be the ID for the route table VMX-1A-DOWN change_subnet_routetable('subnet-0f06b39deb3a6a0bc','rtb-0a1c0956298d9af66') change_subnet_routetable('subnet-08104babe83ad85d3','rtb-0a1c0956298d9af66') change_subnet_routetable('subnet-00d984b9423f807db','rtb-0a1c0956298d9af66') # DEV public subnets change_subnet_routetable('subnet-0783ca3c2a9a1fa87','rtb-0ee718c05fe7d2f47') change_subnet_routetable('subnet-01a0bd7312b9bd17f','rtb-0ee718c05fe7d2f47') change_subnet_routetable('subnet-0af94494946901b21','rtb-0ee718c05fe7d2f47') Not sure if this help.
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