CloudFormationで自身のセキュリティグループIDをターゲットにするグループを作成する

cf.yml

  InternalSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      VpcId: !Ref FirstVPC
      GroupName: !Sub "internal-sg"
      GroupDescription: "Internal SG"

  InternalSecurityGroupIngress:
    Type: AWS::EC2::SecurityGroupIngress
    Properties:
      GroupId: !Ref InternalSecurityGroup
      IpProtocol: -1
      FromPort: 0
      ToPort: 65535
      SourceSecurityGroupId: !Ref InternalSecurityGroup
    DependsOn: InternalSecurityGroup