---
AWSTemplateFormatVersion: "2010-09-09"
Parameters:
  myVpcId:
    Description: MyVpc Id
    Type: AWS::EC2::VPC::Id
Resources:
  mySecurityGroupVpc1:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: 'Security Group Vpc 1'
      VpcId: !Ref myVpcId
      SecurityGroupIngress:
      -
        IpProtocol: 1
        SourceSecurityGroupId: 'sg-1234567'
      -
        IpProtocol: 1
        SourceSecurityGroupId: !Ref mySecurityGroupVpc2
  mySecurityGroupVpc2:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: 'Security Group Vpc 2'
      VpcId: !Ref myVpcId
      SecurityGroupIngress:
      -
        IpProtocol: 1
        SourceSecurityGroupId: !Ref mySecurityGroupVpc1
  MyEC2Instance:
    Type: "AWS::EC2::Instance"
    Properties:
      ImageId: "ami-2f726546"
      InstanceType: t1.micro
      KeyName: testkey
      BlockDeviceMappings:
        -
          DeviceName: /dev/sdm
          Ebs:
            VolumeType: io1
            Iops: !Ref pIops
            DeleteOnTermination: false
            VolumeSize: 20
      NetworkInterfaces:
        - DeviceIndex: "1"
      # Package doesn't exist as parameter
      UserData: !Sub |
        yum install ${Package}
  AnotherInstance:
    Type: "AWS::EC2::Instance"
    Properties:
      ImageId: "ami-2f726546"
      InstanceType: t1.micro
      KeyName: testkey
      BlockDeviceMappings:
        -
          DeviceName: /dev/sdm
          Ebs:
            VolumeType: io1
            Iops: !Ref pIops
            DeleteOnTermination: false
            VolumeSize: 20
      NetworkInterfaces:
        - DeviceIndex: "1"
      # Package doesn't exist as parameter
      UserData:
        Fn::Sub:
        - "yum install ${myPackage} ${Package}"
        -
          myPackage: !Ref httpdPackage