Serverless & RDBS (Part 1) - Set up AWS RDS Aurora and Lambda with serverless

handler.js

// Require and initialize outside of your main handler
const mysql = require('serverless-mysql')({
  config: {
    database: process.env.AURORA_DB_NAME,
    user: process.env.AURORA_USERNAME,
    password: process.env.AURORA_PASSWORD,
    host: process.env.AURORA_HOST,
    port: process.env.AURORA_PORT
  }
});

// Async query handler
exports.sqs = async (event, context) => {
  // Get your query
  const record = event.Records[0];
  const { query } = JSON.parse(record.body);
  
  // Run your query
  let results = await mysql.query(query);

  // Run clean up function
  await mysql.end();

  // Return the results
  return results;
};

// Sync query handler
exports.query = async (event, context) => {
  // Get your query
  const data = event.body ? JSON.parse(event.body) : {};
  const { query } = data;
  
  // Run your query
  let results = await mysql.query(query);

  // Run clean up function
  await mysql.end();

  // Return the results
  return results;
};

serverless.yml

service: aurora

provider:
  name: aws
  runtime: nodejs8.10
  region: us-west-2
  stage: development
  environment:
    AURORA_HOST: ${self:custom.AURORA.HOST}
    AURORA_PORT: ${self:custom.AURORA.PORT}
    AURORA_DB_NAME: ${self:custom.AURORA.DB_NAME}
    AURORA_USERNAME: ${self:custom.AURORA.USERNAME}
    AURORA_PASSWORD: ${self:custom.AURORA.PASSWORD}

# Define variables here for lisibility
custom:
  AURORA:
    DB_NAME: aurora${opt:stage, self:provider.stage}
    USERNAME: master
    PASSWORD: password
    HOST:
      Fn::GetAtt: [AuroraRDSCluster, Endpoint.Address]
    PORT:
      Fn::GetAtt: [AuroraRDSCluster, Endpoint.Port]
    VPC_CIDR: 10
  SQS:
    NAME: aurora-queue-${opt:stage, self:provider.stage}

functions:
  async_query:
    handler: src/handler.sqs
    vpc:
      securityGroupIds:
        - Fn::GetAtt: ServerlessVPC.DefaultSecurityGroup
      subnetIds:
        - Ref: ServerlessSubnetA
        - Ref: ServerlessSubnetB
        - Ref: ServerlessSubnetC
    events:
      - sqs:
          arn:
            Fn::GetAtt: [AuroraSQSQueue, Arn]
          batchSize: 1
  sync_query:
    handler: src/handler.query
    vpc:
      securityGroupIds:
        - Fn::GetAtt: ServerlessVPC.DefaultSecurityGroup
      subnetIds:
        - Ref: ServerlessSubnetA
        - Ref: ServerlessSubnetB
        - Ref: ServerlessSubnetC
    events:
      - http:
          path: /query
          method: post
resources:
  Resources:
    AsyncQueryQueue:
      Type: AWS::SQS::Queue
      Properties:
        QueueName: ${self:custom.SQS.NAME}
    # VPC config
    ServerlessVPC:
      Type: AWS::EC2::VPC
      Properties:
        CidrBlock: ${self:custom.AURORA.VPC_CIDR}.0.0.0/16
        EnableDnsSupport: true
        EnableDnsHostnames: true
        InstanceTenancy: default
    ServerlessSubnetA:
      DependsOn: ServerlessVPC
      Type: AWS::EC2::Subnet
      Properties:
        VpcId:
          Ref: ServerlessVPC
        AvailabilityZone: ${self:provider.region}a
        CidrBlock: ${self:custom.AURORA.VPC_CIDR}.0.0.0/24
    ServerlessSubnetB:
      DependsOn: ServerlessVPC
      Type: AWS::EC2::Subnet
      Properties:
        VpcId:
          Ref: ServerlessVPC
        AvailabilityZone: ${self:provider.region}b
        CidrBlock: ${self:custom.AURORA.VPC_CIDR}.0.1.0/24
    ServerlessSubnetC:
      DependsOn: ServerlessVPC
      Type: AWS::EC2::Subnet
      Properties:
        VpcId:
          Ref: ServerlessVPC
        AvailabilityZone: ${self:provider.region}c
        CidrBlock: ${self:custom.AURORA.VPC_CIDR}.0.2.0/24
    # Aurora DB config
    AuroraSubnetGroup:
      Type: AWS::RDS::DBSubnetGroup
      Properties:
        DBSubnetGroupDescription: "Aurora Subnet Group"
        SubnetIds:
          - Ref: ServerlessSubnetA
          - Ref: ServerlessSubnetB
          - Ref: ServerlessSubnetC
    AuroraRDSClusterParameter:
      Type: AWS::RDS::DBClusterParameterGroup
      Properties:
        Description: Parameter group for the Serverless Aurora RDS DB.
        Family: aurora-mysql5.7
        Parameters:
          character_set_database: "utf32"
    AuroraRDSInstanceParameter:
      Type: AWS::RDS::DBParameterGroup
      Properties:
        Description: Parameter group for the Serverless Aurora RDS DB.
        Family: aurora-mysql5.7
        Parameters:
          sql_mode: IGNORE_SPACE
          max_connections: 100
          wait_timeout: 900
          interactive_timeout: 900
    AuroraRDSCluster:
      Type: "AWS::RDS::DBCluster"
      Properties:
        MasterUsername: ${self:custom.AURORA.USERNAME}
        MasterUserPassword: ${self:custom.AURORA.PASSWORD}
        DBSubnetGroupName:
          Ref: AuroraSubnetGroup
        Engine: aurora-mysql
        EngineVersion: "5.7"
        DatabaseName: ${self:custom.AURORA.DB_NAME}
        BackupRetentionPeriod: 3
        DBClusterParameterGroupName:
          Ref: AuroraRDSClusterParameter
        VpcSecurityGroupIds:
          - Fn::GetAtt: ServerlessVPC.DefaultSecurityGroup
    AuroraRDSInstance:
      Type: "AWS::RDS::DBInstance"
      Properties:
        DBInstanceClass: db.t2.medium
        DBSubnetGroupName:
          Ref: AuroraSubnetGroup
        Engine: aurora-mysql
        EngineVersion: "5.7"
        PubliclyAccessible: false
        DBParameterGroupName:
          Ref: AuroraRDSInstanceParameter
        DBClusterIdentifier:
          Ref: AuroraRDSCluster

How can I fix this error when trying to deploy:
Your application definition - serverless.yml contains value AWS::EC2::VPC for /resources/Resources/ServerlessVPC/Type that violates one of our rules. Please refer to documentation for valid values for /resources/Resources/ServerlessVPC/Type.