cloud-computing-msc-ai-examples/example-projects/tug-of-war-in-the-clouds/aws-boto3-standalone-db/start-and-add-new-target.py

import boto3
from botocore.exceptions import ClientError

region = 'eu-central-1'
availabilityZone = 'eu-central-1b'
subnet1 = 'subnet-41422b28'
subnet2 = 'subnet-5c5f6d16'
subnet3 = 'subnet-6f2ea214'

client = boto3.setup_default_session(region_name=region)
ec2Client = boto3.client("ec2")
ec2Resource = boto3.resource('ec2')

response = ec2Client.describe_vpcs()
vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')

elbv2Client = boto3.client('elbv2')

for i in range(3, 4):
    print("Running new Web Server instance...")
    print("------------------------------------")

    response = ec2Client.run_instances(
        ImageId=imageId,
        InstanceType=instanceType,
        Placement={'AvailabilityZone': availabilityZone, },
        KeyName=keyName,
        MinCount=1,
        MaxCount=1,
        UserData=userDataWebServer,
        SecurityGroupIds=[
            security_group_id,
        ],

        TagSpecifications=[
            {
                'ResourceType': 'instance',
                'Tags': [
                    {'Key': 'Name', 'Value': 'tug-of-war-webserver1'},
                    {'Key': 'tug-of-war', 'Value': 'webserver'}
                ],
            }
        ],
    )

    instanceIdWeb = response['Instances'][0]['InstanceId']

    instance = ec2Resource.Instance(instanceIdWeb)
    instance.wait_until_running()
    instance.load()

    print("tug-of-war-in-the-clouds can be accessed at: " + instance.public_ip_address)

try:
    response = elbv2Client.describe_target_groups(Names=['tug-of-war-targetgroup'])
    targetgroup_arn = response.get('TargetGroups', [{}])[0].get('TargetGroupArn', '')
except ClientError as e:
    print(e)

print("Registering instance...")
print("------------------------------------")

response = elbv2Client.register_targets(
    TargetGroupArn=targetgroup_arn,
    Targets=[
        {
            'Id': instanceIdWeb,
        },
    ],
)