--- AWSTemplateFormatVersion: "2010-09-09" Parameters: myVpcId: Description: MyVpc Id Type: AWS::EC2::VPC::Id mySecurityGroup: Description: Security group to allow traffic from Type: String mySecurity2Group: Description: Second Security Group Type: String mySecurity3Group: Description: Third Security Group Type: String mySecurityGroupList: Description: Security Group List Type: List Resources: mySecurityGroupNonVpc: Type: AWS::EC2::SecurityGroup Properties: GroupDescription: 'Special charaters like ^ and " are not supported' SecurityGroupIngress: - IpProtocol: 1 SourceSecurityGroupId: 'sg-1234567' mySecurityGroupVpc: Type: AWS::EC2::SecurityGroup Properties: GroupDescription: 'Security Group Vpc' VpcId: !Ref myVpcId SecurityGroupIngress: - IpProtocol: 1 SourceSecurityGroupName: String - IpProtocol: 1 CidrIp: '10.0.0.0/8' SourceSecurityGroupId: !Ref mySecurityGroup - IpProtocol: "1" CidrIp: "10.0.0.0" - IpProtocol: 1 SourceSecurityGroupId: !Ref mySecurityGroupNonVpc - IpProtocol: 1 SourceSecurityGroupId: vpc-1234567 CidrIp: '10.0.0.0/8' SecurityGroupRuleSSM: Type: 'AWS::EC2::SecurityGroupIngress' Properties: GroupId: !Ref mySecurityGroupVpc IpProtocol: tcp FromPort: 443 ToPort: 443 CidrIp: '{{resolve:ssm:mysubnet}}' mySecurityGroupIngress: Type: AWS::EC2::SecurityGroupIngress Properties: GroupId: !Ref mySecurityGroupVpc IpProtocol: 1 SourceSecurityGroupId: !Ref mySecurityGroupNonVpc mySecurityGroupIngress2: Type: AWS::EC2::SecurityGroupIngress Properties: GroupId: !Ref mySecurityGroupVpc IpProtocol: 1 SourceSecurityGroupId: !Ref mySecurity3Group mySecurityGroupIngressExclusive: Type: AWS::EC2::SecurityGroupIngress Properties: GroupId: !Ref mySecurityGroupVpc GroupName: BadGroup myInstance: Type: AWS::EC2::Instance Properties: ImageId: ami-123456 SecurityGroupIds: - !Ref mySecurityGroup myLaunchTemplate: Type: AWS::EC2::LaunchTemplate Properties: LaunchTemplateData: SecurityGroupIds: - !Ref mySecurity2Group myLaunchTemplate2: Type: AWS::EC2::LaunchTemplate Properties: LaunchTemplateData: SecurityGroupIds: !Ref mySecurityGroupList