CloudFormationでVPCの作成(YAML版)

はじめに

結構前にCloudFormationがYAML対応しました。
AWS CloudFormation で YAML テンプレートとクロススタックリファレンスをサポート

Linux構築ではAnsible使いたいので、
CloudFormationでYAMLを利用したら見た目が統一できるので作業効率も上がるかなと
とりあえずVPC作成までYAML形式でCloudFormation作成してみました。

#テンプレートファイル
テンプレートは以下のとおり
VPC、ルートテーブル、サブネット、インターネットゲートウェイを作成しています。
サブネットは４つ。パブリックとプライベートのサブネットを各AZごとに、
パラメータは環境とシステム短縮名を入れるだけにしました。
また短縮形を多用してステップ数を減らしてます。

cF_VPCsubnet.template

AWSTemplateFormatVersion: '2010-09-09'
Description:
  VPC & subnet create
Parameters:
  EnvType: 
    Description: Environment type.
    Default: dev
    Type: String
    AllowedValues: 
      - dev
      - mnt
      - prd
    ConstraintDescription: must specify dev or mnt or prd.
  ProjectId: 
    Description: Project name id.
    Type: String
    MinLength: "3"
    MaxLength: "3"
    AllowedPattern: "[a-zA-Z0-9]*"
    ConstraintDescription: must specify Project id.

Resources:
# Create VPC
  MyVPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: 10.0.0.0/24
      EnableDnsSupport: 'true'
      EnableDnsHostnames: 'true'
      InstanceTenancy: default
      Tags:
      - Key: Name
        Value: !Join [ "-", [ "Ref":"EnvType" , "Ref":"ProjectId" ,"vpc" ] ]

# Create Public RouteTable
  PublicRouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      VpcId: !Ref MyVPC
      Tags:
      - Key: Name
        Value: !Join [ "-", [ "Ref":"EnvType" , "Ref":"ProjectId" ,"pub-route" ] ]

# Create Private RouteTable
  PrivateRouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      VpcId: !Ref MyVPC
      Tags:
      - Key: Name
        Value: !Join [ "-", [ "Ref":"EnvType" , "Ref":"ProjectId" ,"pri-route" ] ]

# Create Public Subnet A
  PublicSubnetA:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref MyVPC
      CidrBlock: 10.0.0.0/27
      AvailabilityZone: "ap-northeast-1a"
      Tags:
      - Key: Name
        Value: !Join [ "-", [ "Ref":"EnvType" , "Ref":"ProjectId" ,"PublicSunetA" ] ]
  PubSubnetARouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnetA
      RouteTableId: !Ref PublicRouteTable

# Create Public Subnet C
  PublicSubnetC:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref MyVPC
      CidrBlock: 10.0.0.32/27
      AvailabilityZone: "ap-northeast-1c"
      Tags:
      - Key: Name
        Value: !Join [ "-", [ "Ref":"EnvType" , "Ref":"ProjectId" ,"PublicSunetC" ] ]
  PubSubnetCRouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnetC
      RouteTableId: !Ref PublicRouteTable

# Create Private Subnet A
  PrivateSubnetA:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref MyVPC
      CidrBlock: 10.0.0.64/27
      AvailabilityZone: "ap-northeast-1a"
      Tags:
      - Key: Name
        Value: !Join [ "-", [ "Ref":"EnvType" , "Ref":"ProjectId" ,"PrivateSubnetA" ] ]
  PriSubnetARouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PrivateSubnetA
      RouteTableId: !Ref PrivateRouteTable

# Create Private Subnet C
  PrivateSubnetC:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref MyVPC
      CidrBlock: 10.0.0.96/27
      AvailabilityZone: "ap-northeast-1c"
      Tags:
      - Key: Name
        Value: !Join [ "-", [ "Ref":"EnvType" , "Ref":"ProjectId" ,"PrivateSubnetC" ] ]
  PriSubnetCRouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PrivateSubnetC
      RouteTableId: !Ref PrivateRouteTable

# Create InternetGateway
  myInternetGateway:
    Type: "AWS::EC2::InternetGateway"
    Properties:
      Tags:
      - Key: Name
        Value: !Join [ "-", [ "Ref":"EnvType" , "Ref":"ProjectId" ,"igw" ] ]
  AttachGateway:
    Type: AWS::EC2::VPCGatewayAttachment
    Properties:
      VpcId: !Ref MyVPC
      InternetGatewayId: !Ref myInternetGateway
  myRoute:
    Type: AWS::EC2::Route
    DependsOn: myInternetGateway
    Properties:
      RouteTableId: !Ref PublicRouteTable
      DestinationCidrBlock: 0.0.0.0/0
      GatewayId: !Ref myInternetGateway

Outputs:
  StackVPC:
    Description: The ID of the VPC
    Value: !Ref MyVPC
    Export:
      Name: !Sub "${AWS::StackName}-VPCID"

  StackPubSubnetA:
    Description: The ID of the VPC Subnet
    Value: !Ref PublicSubnetA
    Export:
      Name: !Sub "${AWS::StackName}-PublicSubnetA"

  StackPubSubnetB:
    Description: The ID of the VPC Subnet
    Value: !Ref PublicSubnetC
    Export:
      Name: !Sub "${AWS::StackName}-PublicSubnetC"

  StackPriSubnetA:
    Description: The ID of the VPC Subnet
    Value: !Ref PrivateSubnetA
    Export:
      Name: !Sub "${AWS::StackName}-PrivateSubnetA"

  StackPriSubnetB:
    Description: The ID of the VPC Subnet
    Value: !Ref PrivateSubnetC
    Export:
      Name: !Sub "${AWS::StackName}-PrivateSubnetC"

まとめ

見やすいですね！
めっちゃ作りやすかったです。
括弧が少ないがすごい助かります。
AWS::EC2::SubnetRouteTableAssociationで
サブネット複数指定できたらもっと行数が短くなるのですが、
やり方がわかりませんでした。

次はクロススタックリファレンス使ってみたいです。