gistfile1.py

subnets = {
    'PublicSubnet1': {
        'AZ': 'eu-west-1a',
        'CIDR': '10.0.0.0/24'
    },
    'PublicSubnet2': {
        'AZ': 'eu-west-1b',
        'CIDR': '10.0.1.0/24'
    },
    'PublicSubnet3': {
        'AZ': 'eu-west-1c',
        'CIDR': '10.0.2.0/24'
    },
    'PrivateSubnet1': {
        'AZ': 'eu-west-1a',
        'CIDR': '10.0.3.0/24'
    },
    'PrivateSubnet2': {
        'AZ': 'eu-west-1b',
        'CIDR': '10.0.4.0/24'
    },
    'PrivateSubnet3': {
        'AZ': 'eu-west-1c',
        'CIDR': '10.0.5.0/24'
    },
}

@task
def vpc_name2id(name='bototest'):
    vpcs = ec2.describe_vpcs(Filters=[{'Name': 'tag:Name', 
                                       'Values': [name]}])
    if vpcs:
        try:
            return vpcs['Vpcs'][0]['VpcId']
        except (KeyError, IndexError):
            pass
    return None

@task
def create_vpc(vpc_name='bototest'):
    vpc_id = vpc_name2id(vpc_name)

    if not vpc_id:
        print 'creating VPC %s' % vpc_name

        vpc_id = ec2.create_vpc(CidrBlock=vpc_cidr)['Vpc']['VpcId']
        ec2.get_waiter('vpc_available').wait(VpcIds=[vpc_id])
        ec2.create_tags(Resources=[vpc_id],
                        Tags=[{'Key': 'Name', 'Value': vpc_name}])
        ec2.modify_vpc_attribute(VpcId=vpc_id,
                                 EnableDnsHostnames={'Value': True})

        for subnet_name, config in subnets.items():
            print 'creating Subnet %s' % subnet_name

            subnet_id = ec2.create_subnet(
                VpcId=vpc_id, CidrBlock=config['CIDR'],
                AvailabilityZone=config['AZ'])['Subnet']['SubnetId']

            ec2.get_waiter('subnet_available').wait(SubnetIds=[subnet_id])
            ec2.create_tags(Resources=[subnet_id],
                            Tags=[{'Key': 'Name', 'Value': subnet_name}])
    else:
        print 'VPC %s already exists' % vpc_name