Neutral Point Measurement


    1.0.4 • Public • Published


    serverless npm version MIT licensed npm downloads

    Automatically creates an AWS Virtual Private Cloud (VPC) using all available Availability Zones (AZ) in a region.

    This plugin provisions the following resources:

    • AWS::EC2::VPC
    • AWS::EC2::InternetGateway (for outbound internet access from "Public" subnet)
    • AWS::EC2::VPCGatewayAttachment (to attach the InternetGateway to the VPC)
    • AWS::EC2::SecurityGroup (to execute Lambda functions [AppSecurityGroup])

    If the VPC is allocated a /16 subnet, each availability zone within the region will be allocated a /20 subnet. Within each availability zone, this plugin will further divide the subnets:

    • AWS::EC2::Subnet "Public" (/22) - default route set to the InternetGateway
    • AWS::EC2::Subnet "Application" (/21) - no default route set (can be set to either a NatGateway or NatInstance)
    • AWS::EC2::Subnet "Database" (/22) - no default route set

    The subnetting layout was heavily inspired by the now shutdown Skyliner platform. 😞

    Optionally, this plugin can also create AWS::EC2::NatGateway instances in each availability zone which requires provisioning AWS::EC2::EIP resources (AWS limits you to 5 per VPC, so if you want to provision your VPC across all 6 us-east availability zones, you'll need to request an VPC EIP limit increase from AWS).

    Instead of using the managed AWS::EC2::NatGateway instances, this plugin can also provision a single t2.micro NAT instance in PublicSubnet1 which will allow HTTP/HTTPS traffic from the "Application" subnets to reach the Internet.

    Lambda functions will execute within the "Application" subnet and only be able to access:

    • S3 (via an S3 VPC endpoint)
    • DynamoDB (via an DynamoDB VPC endpoint)
    • RDS instances (provisioned within the "DB" subnet)
    • ElastiCache instances (provisioned within the "DB" subnet)
    • RedShift (provisioned within the "DB" subnet),
    • DAX clusters (provisioned within the "DB" subnet)
    • Neptune clusters (provisioned with the "DB" subnet)
    • Internet Access (if using a NatGateway or a NatInstance)

    If your Lambda functions need to access the internet, then you MUST provision NatGateway resources or a NAT instance.

    By default, AWS::EC2::VPCEndpoint "Gateway" endpoints for S3 and DynamoDB will be provisioned within each availability zone to provide internal access to these services (there is no additional charge for using Gateway Type VPC endpoints). You can selectively control which AWS::EC2::VPCEndpoint "Interface" endpoints are available within your VPC using the services configuration option below. Not all AWS services are available in every region, so the plugin will query AWS to validate the services you have selected and notify you if any changes are required (there is an additional charge for using Interface Type VPC endpoints).

    If you specify more then one availability zone, this plugin will also provision the following database-related resources (controlled using the subnetGroups plugin option):

    • AWS::RDS::DBSubnetGroup
    • AWS::ElastiCache::SubnetGroup
    • AWS::Redshift::ClusterSubnetGroup
    • AWS::DAX::SubnetGroup

    to make it easier to create these resources across all of the availability zones.


    $ npx sls plugin install -n serverless-vpc-plugin


    • All vpcConfig configuration parameters are optional
    # add in your serverless.yml
      - serverless-vpc-plugin
      # you do not need to provide the "vpc" section as this plugin will populate it automatically
          -  # plugin will add LambdaExecutionSecurityGroup to this list
          -  # plugin will add the "Application" subnets to this list
        # Whether plugin is enabled. Can be used to selectively disable plugin
        # on certain stages or configurations. Defaults to true.
        enabled: true
        cidrBlock: ''
        # if createNatGateway is a boolean "true", a NAT Gateway and EIP will be provisioned in each zone
        # if createNatGateway is a number, that number of NAT Gateways will be provisioned
        createNatGateway: 2
        # When enabled, the DB subnet will only be accessible from the Application subnet
        # Both the Public and Application subnets will be accessible from
        createNetworkAcl: false
        # Whether to create the DB subnet
        createDbSubnet: true
        # Whether to enable VPC flow logging to an S3 bucket
        createFlowLogs: false
        # Whether to create a bastion host
        createBastionHost: false
        bastionHostKeyName: MyKey # required if creating a bastion host
        # Whether to create a NAT instance
        createNatInstance: false
        # Whether to create AWS Systems Manager (SSM) Parameters
        createParameters: false
        # Optionally specify AZs (defaults to auto-discover all availabile AZs)
          - us-east-1a
          - us-east-1b
          - us-east-1c
        # By default, S3 and DynamoDB endpoints will be available within the VPC
        # see
        # for a list of available service endpoints to provision within the VPC
        # (varies per region)
          - kms
          - secretsmanager
        # Optionally specify subnet groups to create. If not provided, subnet groups
        # for RDS, Redshift, ElasticCache and DAX will be provisioned.
          - rds
        # Whether to export stack outputs so it may be consumed by other stacks
        exportOutputs: false

    CloudFormation Outputs

    After executing serverless deploy, the following CloudFormation Stack Outputs will be provided:

    • VPC: VPC logical resource ID
    • AppSecurityGroup: Security Group ID that the applications use when executing within the VPC
    • LambdaExecutionSecurityGroupId: DEPRECATED - Please use AppSecurityGroupId instead
    • BastionSSHUser: SSH username to access the bastion host, if provisioned
    • BastionEIP: Elastic IP address associated to the bastion host, if provisioned
    • RDSSubnetGroup: SubnetGroup associated to RDS, if provisioned
    • ElastiCacheSubnetGroup: SubnetGroup associated to ElastiCache, if provisioned
    • RedshiftSubnetGroup: SubnetGroup associated to Redshift, if provisioned
    • DAXSubnetGroup: SubnetGroup associated to DAX, if provisioned
    • AppSubnet{i}: Each of the generated "Application" Subnets, where i is a 1 based index

    Exporting CloudFormation Outputs

    Setting exportOutputs: true will export stack outputs. The name of the exported value will be prefixed by the cloud formation stack name (AWS::StackName). For example, the value of the VPC output of a stack named foo-prod will be exported as foo-prod-VPC.

    SSM Parameters

    Setting createParameters: true will create the below parameters in the AWS Systems Manager (SSM) Parameter Store:

    • /SLS/${AWS::StackName}/VPC: VPC logical resource ID
    • /SLS/${AWS::StackName}/AppSecurityGroup: Security Group ID that the applications use when executing within the VPC
    • /SLS/${AWS::StackName}/RDSSubnetGroup: SubnetGroup associated to RDS, if provisioned
    • /SLS/${AWS::StackName}/ElastiCacheSubnetGroup: SubnetGroup associated to ElastiCache, if provisioned
    • /SLS/${AWS::StackName}/RedshiftSubnetGroup: SubnetGroup associated to Redshift, if provisioned
    • /SLS/${AWS::StackName}/DAXSubnetGroup: SubnetGroup associated to DAX, if provisioned
    • /SLS/${AWS::StackName}/PublicSubnets: Subnet ID's for the "Public" subnets
    • /SLS/${AWS::StackName}/AppSubnets: Subnet ID's for the "Application" subnets
    • /SLS/${AWS::StackName}/DBSubnets: Subnet ID's for the "Database" subnets

    As an example, if the stack name you want to reference is new-service-dev, you can then use Serverless' built-in support for reading from SSM:

        - ${ssm:/SLS/new-service-dev/AppSecurityGroup}
      subnetIds: ${ssm:/SLS/new-service-dev/AppSubnets~split}

    (Note the usage of ~split to split the SSM StringList parameter type and return an array of values)


    npm i serverless-vpc-plugin

    DownloadsWeekly Downloads






    Unpacked Size

    68.1 kB

    Total Files


    Last publish


    • jplock