本模版示例支持为单/多个（最多3个）SLB添加所有创建的ECS做多个后端服务器

简述：

模版中的ECS实例支持指定不同的实例名和主机名，并且可以选择网络类型为VPC或CLASSIC，当选择不创建VPC时，需要更换ECS实例规格类型，原因是能创建ECS的实例规格，与VPC网络类型的实例规格不一样；默认是新创建一个SLB实例，如果传入SLB实例的ID,那么需要更改下SLB的数量，原因是根据模版中SLB的数量值和SLB的ID来确认添加后端服务器的SLB实例数量，需要两者保持一致（e.g. 用两个已经创建的SLB的ID来做参数，那么SLB数量值胥更改为2）。
本模版目前最多支持往3个SLB实例附加后端服务器；

涉及资源：

ALIYUN::ECS::VPC （虚拟专有网络）
ALIYUN::ECS::VSwitch （虚拟交换机）
ALIYUN::ECS::SecurityGroup （安全组）
ALIYUN::ECS::InstanceGroup （云服务器组）
ALIYUN::SLB::LoadBalancer （负载均衡）
ALIYUN::SLB::BackendServerAttachment （为负载均衡添加后端服务器）

1.创建ECS InstanceGroup

下面是创建VPC类型的ECS Instance代码示例，实例中批量创建ECS指定不同的实例名和主机名。

e.g. 

HostName[1,4]Test
HostName: 是ECS InstanceGroup主机命名规则的前缀；
[1,4]: 1为起始数字，4为数字的位数; 
Test: 为命名规则的尾缀；
结果创建的ECS的主机名分别为：HostName0001Test, HostName002Test, HostName0003Test, .....

{
  "Type": "ALIYUN::ECS::InstanceGroup",
  "Condition": "IsCreateVpc",
  "Properties": {
    "IoOptimized": "optimized",
    "ImageId": {
      "Ref": "EcsGroupImageId"
    },
    "SecurityGroupId": {
      "Fn::If": [
        "IsCreateVpc",
        {
          "Fn::GetAtt": [
            "SG",
            "SecurityGroupId"
          ]
        },
        {
          "Ref": "ALIYUN::NoValue"
        }
      ]
    },
    "Password": {
      "Ref": "EcsPassword"
    },
    "MinAmount": {
      "Ref": "MaxAmount"
    },
    "SystemDiskCategory": {
      "Ref": "EcsSystemDiskCategory"
    },
    "MaxAmount": {
      "Ref": "MaxAmount"
    },
    "VSwitchId": {
      "Fn::If": [
        "IsCreateVpc",
        {
          "Fn::GetAtt": [
            "VSwitch",
            "VSwitchId"
          ]
        },
        {
          "Ref": "ALIYUN::NoValue"
        }
      ]
    },
    "VpcId": {
      "Fn::If": [
        "IsCreateVpc",
        {
          "Fn::GetAtt": [
            "Vpc",
            "VpcId"
          ]
        },
        {
          "Ref": "ALIYUN::NoValue"
        }
      ]
    },
    "InstanceType": {
      "Ref": "EcsGroupInstanceType"
    },
    "InstanceName": {
      "Fn::Join": [
        "",
        [
          {
            "Ref": "InstanceNamePrefix"
          },
          "[",
          {
            "Ref": "InstanceNameBeginNumber"
          },
          ",4]",
          {
            "Ref": "InstanceNameSuffix"
          }
        ]
      ]
    },
    "HostName": {
      "Fn::Join": [
        "",
        [
          "HostNameTest",
          "[1,4]",
          {
            "Ref": "InstanceNameSuffix"
          }
        ]
      ]
    },
    "AllocatePublicIP": {
      "Fn::If": [
        "IsCreateVpc",
        false,
        true
      ]
    },
    "UserData": {
      "Fn::Join": [
        "",
        [
          "#!/bin/sh\n",
          "echo \"hello , create ecs group test\" > /tmp/create_test.log\n"
        ]
      ]
    }
  }
}

2.为SLB实例添加后端服务器

下面示例代码创建的附加后端服务器功能，用到的一些ROS的函数功能，以及自己定义的一些逻辑判断，具体可根据方案模版查阅；
因为考虑到要为多个SLB实例添加后端服务器的情况，本方案用了Conditions及函数的功能配合完成了是为单/多个SLB添加后端服务器。

{
  "Type": "ALIYUN::SLB::BackendServerAttachment",
  "Condition": "IsAttachment1",
  "Properties": {
    "LoadBalancerId": {
      "Fn::If": [
        "IsCreateSlb",
        {
          "Fn::GetAtt": [
            "LoadBalancer",
            "LoadBalancerId"
          ]
        },
        {
          "Fn::Select": [
            "0",
            {
              "Fn::Split": [
                ",",
                {
                  "Ref": "LoadBalancerIds"
                }
              ]
            }
          ]
        }
      ]
    },
    "BackendServerList": {
      "Fn::If": [
        "IsCreateVpc",
        {
          "Fn::GetAtt": [
            "EcsInstanceGroupWithVpc",
            "InstanceIds"
          ]
        },
        {
          "Fn::GetAtt": [
            "EcsInstanceGroupNoVpc",
            "InstanceIds"
          ]
        }
      ]
    },
    "BackendServerWeightList": {
      "Fn::Split": [
        ",",
        {
          "Ref": "BackendServerWeightList"
        }
      ]
    }
  }
}

3. 条件Code示例

请结合模版中的Paramters。

{
  "IsAttachment1": {
    "Fn::And": [
      {
        "Fn::Equals": [
          1,
          {
            "Ref": "SlbCount"
          }
        ]
      },
      {
        "Fn::Or": [
          "IsCreateSlb",
          {
            "Fn::Not": "IsCreateSlb"
          }
        ]
      }
    ]
  },
  "IsAttachment2": {
    "Fn::And": [
      {
        "Fn::Equals": [
          2,
          {
            "Ref": "SlbCount"
          }
        ]
      },
      {
        "Fn::Not": "IsCreateSlb"
      }
    ]
  },
  "IsAttachment3": {
    "Fn::And": [
      {
        "Fn::Equals": [
          3,
          {
            "Ref": "SlbCount"
          }
        ]
      },
      {
        "Fn::Not": "IsCreateSlb"
      }
    ]
  },
  "IsCreateSlb": {
    "Fn::Equals": [
      "None",
      {
        "Ref": "LoadBalancerIds"
      }
    ]
  },
  "IsCreateVpc": {
    "Fn::Equals": [
      "Yes",
      {
        "Ref": "IsCreateVpc"
      }
    ]
  },
  "NotUseVpc": {
    "Fn::Equals": [
      "No",
      {
        "Ref": "IsCreateVpc"
      }
    ]
  }
}

方案模版如下:

{
  "ROSTemplateFormatVersion": "2015-09-01",
  "Conditions": {
    "IsAttachment1": {
      "Fn::And": [
        {
          "Fn::Equals": [
            1,
            {
              "Ref": "SlbCount"
            }
          ]
        },
        {
          "Fn::Or": [
            "IsCreateSlb",
            {
              "Fn::Not": "IsCreateSlb"
            }
          ]
        }
      ]
    },
    "IsAttachment2": {
      "Fn::And": [
        {
          "Fn::Equals": [
            2,
            {
              "Ref": "SlbCount"
            }
          ]
        },
        {
          "Fn::Not": "IsCreateSlb"
        }
      ]
    },
    "IsAttachment3": {
      "Fn::And": [
        {
          "Fn::Equals": [
            3,
            {
              "Ref": "SlbCount"
            }
          ]
        },
        {
          "Fn::Not": "IsCreateSlb"
        }
      ]
    },
    "IsCreateSlb": {
      "Fn::Equals": [
        "None",
        {
          "Ref": "LoadBalancerIds"
        }
      ]
    },
    "IsCreateVpc": {
      "Fn::Equals": [
        "Yes",
        {
          "Ref": "IsCreateVpc"
        }
      ]
    },
    "NotUseVpc": {
      "Fn::Equals": [
        "No",
        {
          "Ref": "IsCreateVpc"
        }
      ]
    }
  },
  "Parameters": {
    "SlbCount": {
      "Type": "Number",
      "Label": "Slb的数量(确认SLB数量)",
      "Description": "需要添加的Slb实例的数量, 根据数量填写《Slb实例Id》。",
      "Default": 1,
      "AllowedValues": [
        1,
        2,
        3
      ]
    },
    "BackendServerWeightList": {
      "Type": "String",
      "Label": "Slb后端服务器权重",
      "Description": "Slb后端服务器权重,允许单个或多个;如指定一个, 所有的Ecs权重都是此值;多个用','(英文逗号)隔开, 多个数量需对应《需要添加到Slb中的Ecs后端服务器》, 序号顺序一一对应。 e.g. 20,30,100 ",
      "Default": "100"
    },
    "LoadBalancerIds": {
      "Type": "String",
      "Label": "Slb实例Id",
      "Description": "最多提供三个slb,多个slb需要存在于一个region内, 允许单个或多个, 多个用','(英文逗号)隔开, \ne.g. lb-bp183j4sfd02j02csd,lb-bid839fjn2j78bl,lb-sl39f8fvp6cbd4;\n如使用默认值（None）不指定，默认创建一个Slb实例。",
      "Default": "None"
    },
    "IsCreateVpc": {
      "Type": "String",
      "Description": "是否创建Vpc，默认不创建。",
      "Label": "是否创建Vpc",
      "Default": "Yes",
      "AllowedValues": [
        "No",
        "Yes"
      ]
    },
    "EcsGroupInstanceType": {
      "Type": "String",
      "Description": "创建ECS实例的规格，默认为ecs.n1.large, 网络为classic类型可选用ecs.n1.large 或 ecs.n1.xlarge, 网络为Vpc类型可选用ecs.c5.large 或 ecs.g5.large",
      "Label": "ECS实例规格",
      "Default": "ecs.c5.large",
      "AllowedValues": [
        "ecs.n1.large",
        "ecs.n1.xlarge",
        "ecs.c5.large",
        "ecs.g5.large"
      ]
    },
    "MaxAmount": {
      "Type": "Number",
      "Description": "一次需要创建ECS实例数量，与《ECS实例名称的开始数字》可用值对应。",
      "Label": "创建ECS实例数量",
      "Default": 2
    },
    "EcsGroupImageId": {
      "Type": "String",
      "Description": "用于启动ECS实例的镜像ID。",
      "Label": "ECS实例镜像",
      "Default": "centos_7_06_64_20G_alibase_20190218.vhd",
      "AssociationProperty": "ALIYUN::ECS::Instance:ImageId"
    },
    "EcsPassword": {
      "Type": "String",
      "Description": "登陆ECS实例的密码。",
      "ConstraintDescription": "8-30个字符,字符，包括3种类型的大写字母、小写字母、数字或特殊字符。",
      "Label": "ECS实例密码",
      "AllowedPattern": "[a-zA-Z0-9-\\(\\)\\`\\~\\!@\\#\\$%\\^&\\*-+=\\|\\{\\}\\[\\]\\:\\;\\‘\\,\\.\\?\\/]*",
      "MaxLength": 30,
      "MinLength": 8,
      "NoEcho": true,
      "Confirm": true
    },
    "EcsSystemDiskCategory": {
      "Type": "String",
      "Description": "系统磁盘类型: 高效云盘(cloud_efficiency) or 普通云盘(cloud_ssd)",
      "Label": "ECS实例系统磁盘类型",
      "Default": "cloud_ssd",
      "AllowedValues": [
        "cloud_efficiency",
        "cloud_ssd"
      ]
    },
    "InstanceNamePrefix": {
      "Type": "String",
      "Description": "ECS实例名称前缀, 必须要指定, 不能为空。最长128个字符，可包含英文、中文、数字、（_）、（.）、(-)。",
      "Label": "ECS实例名称前缀",
      "Default": "EcsGroup"
    },
    "InstanceNameBeginNumber": {
      "Type": "String",
      "Description": "ECS实例名称的开始数字,默认为0000，可用值分别是0000、0005、0010、0015、0020, 数字位数已经固定最长为4位。",
      "Label": "ECS实例名称的开始数字",
      "Default": "0"
    },
    "InstanceNameSuffix": {
      "Type": "String",
      "Description": "指定ECS实例名称后缀（可选）,默认为空。",
      "Label": "ECS实例名称后缀",
      "Default": "Test"
    }
  },
  "Resources": {
    "Vpc": {
      "Type": "ALIYUN::ECS::VPC",
      "Condition": "IsCreateVpc",
      "Properties": {
        "VpcName": {
          "Fn::Join": [
            "-",
            [
              {
                "Ref": "ALIYUN::StackName"
              },
              "Vpc"
            ]
          ]
        },
        "CidrBlock": "192.168.0.0/16",
        "Description": {
          "Fn::Join": [
            " ",
            [
              "Vpc of the",
              {
                "Ref": "ALIYUN::StackName"
              }
            ]
          ]
        }
      }
    },
    "VSwitch": {
      "Type": "ALIYUN::ECS::VSwitch",
      "Condition": "IsCreateVpc",
      "Properties": {
        "VSwitchName": {
          "Fn::Join": [
            "-",
            [
              {
                "Ref": "ALIYUN::StackName"
              },
              "VSwitch"
            ]
          ]
        },
        "VpcId": {
          "Fn::GetAtt": [
            "Vpc",
            "VpcId"
          ]
        },
        "CidrBlock": "192.168.0.0/16",
        "Description": {
          "Fn::Join": [
            " ",
            [
              "VSwitch of the",
              {
                "Ref": "ALIYUN::StackName"
              }
            ]
          ]
        },
        "ZoneId": {
          "Fn::Select": [
            "0",
            {
              "Fn::GetAZs": {
                "Ref": "ALIYUN::Region"
              }
            }
          ]
        }
      }
    },
    "SG": {
      "Type": "ALIYUN::ECS::SecurityGroup",
      "Condition": "IsCreateVpc",
      "Properties": {
        "VpcId": {
          "Fn::GetAtt": [
            "Vpc",
            "VpcId"
          ]
        },
        "SecurityGroupName": {
          "Fn::Join": [
            "-",
            [
              {
                "Ref": "ALIYUN::StackName"
              },
              "SG"
            ]
          ]
        },
        "SecurityGroupIngress": [
          {
            "PortRange": "-1/-1",
            "Priority": 1,
            "SourceCidrIp": "0.0.0.0/0",
            "IpProtocol": "all",
            "NicType": "intranet"
          }
        ],
        "SecurityGroupEgress": [
          {
            "PortRange": "-1/-1",
            "Priority": 1,
            "IpProtocol": "all",
            "DestCidrIp": "0.0.0.0/0",
            "NicType": "intranet"
          }
        ]
      }
    },
    "EcsInstanceGroupWithVpc": {
      "Type": "ALIYUN::ECS::InstanceGroup",
      "Condition": "IsCreateVpc",
      "Properties": {
        "IoOptimized": "optimized",
        "ImageId": {
          "Ref": "EcsGroupImageId"
        },
        "SecurityGroupId": {
          "Fn::If": [
            "IsCreateVpc",
            {
              "Fn::GetAtt": [
                "SG",
                "SecurityGroupId"
              ]
            },
            {
              "Ref": "ALIYUN::NoValue"
            }
          ]
        },
        "Password": {
          "Ref": "EcsPassword"
        },
        "MinAmount": {
          "Ref": "MaxAmount"
        },
        "SystemDiskCategory": {
          "Ref": "EcsSystemDiskCategory"
        },
        "MaxAmount": {
          "Ref": "MaxAmount"
        },
        "VSwitchId": {
          "Fn::If": [
            "IsCreateVpc",
            {
              "Fn::GetAtt": [
                "VSwitch",
                "VSwitchId"
              ]
            },
            {
              "Ref": "ALIYUN::NoValue"
            }
          ]
        },
        "VpcId": {
          "Fn::If": [
            "IsCreateVpc",
            {
              "Fn::GetAtt": [
                "Vpc",
                "VpcId"
              ]
            },
            {
              "Ref": "ALIYUN::NoValue"
            }
          ]
        },
        "InstanceType": {
          "Ref": "EcsGroupInstanceType"
        },
        "InstanceName": {
          "Fn::Join": [
            "",
            [
              {
                "Ref": "InstanceNamePrefix"
              },
              "[",
              {
                "Ref": "InstanceNameBeginNumber"
              },
              ",4]",
              {
                "Ref": "InstanceNameSuffix"
              }
            ]
          ]
        },
        "HostName": {
          "Fn::Join": [
            "",
            [
              "HostNameTest",
              "[1,4]",
              {
                "Ref": "InstanceNameSuffix"
              }
            ]
          ]
        },
        "AllocatePublicIP": {
          "Fn::If": [
            "IsCreateVpc",
            false,
            true
          ]
        },
        "UserData": {
          "Fn::Join": [
            "",
            [
              "#!/bin/sh\n",
              "echo \"hello , create ecs group test\" > /tmp/create_test.log\n"
            ]
          ]
        }
      }
    },
    "EcsInstanceGroupNoVpc": {
      "Type": "ALIYUN::ECS::InstanceGroup",
      "Condition": "NotUseVpc",
      "Properties": {
        "IoOptimized": "optimized",
        "ImageId": {
          "Ref": "EcsGroupImageId"
        },
        "Password": {
          "Ref": "EcsPassword"
        },
        "MinAmount": {
          "Ref": "MaxAmount"
        },
        "SystemDiskCategory": {
          "Ref": "EcsSystemDiskCategory"
        },
        "MaxAmount": {
          "Ref": "MaxAmount"
        },
        "InstanceType": {
          "Ref": "EcsGroupInstanceType"
        },
        "InstanceName": {
          "Fn::Join": [
            "",
            [
              {
                "Ref": "InstanceNamePrefix"
              },
              "[",
              {
                "Ref": "InstanceNameBeginNumber"
              },
              ",",
              "4",
              "]",
              {
                "Ref": "InstanceNameSuffix"
              }
            ]
          ]
        }
      }
    },
    "LoadBalancer": {
      "Condition": "IsCreateSlb",
      "Type": "ALIYUN::SLB::LoadBalancer",
      "Properties": {
        "AddressType": "internet"
      }
    },
    "BackendServerAttachment1": {
      "Type": "ALIYUN::SLB::BackendServerAttachment",
      "Condition": "IsAttachment1",
      "Properties": {
        "LoadBalancerId": {
          "Fn::If": [
            "IsCreateSlb",
            {
              "Fn::GetAtt": [
                "LoadBalancer",
                "LoadBalancerId"
              ]
            },
            {
              "Fn::Select": [
                "0",
                {
                  "Fn::Split": [
                    ",",
                    {
                      "Ref": "LoadBalancerIds"
                    }
                  ]
                }
              ]
            }
          ]
        },
        "BackendServerList": {
          "Fn::If": [
            "IsCreateVpc",
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupWithVpc",
                "InstanceIds"
              ]
            },
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupNoVpc",
                "InstanceIds"
              ]
            }
          ]
        },
        "BackendServerWeightList": {
          "Fn::Split": [
            ",",
            {
              "Ref": "BackendServerWeightList"
            }
          ]
        }
      }
    },
    "BackendServerAttachment2-1": {
      "Type": "ALIYUN::SLB::BackendServerAttachment",
      "Condition": "IsAttachment2",
      "Properties": {
        "LoadBalancerId": {
          "Fn::Select": [
            "0",
            {
              "Fn::Split": [
                ",",
                {
                  "Ref": "LoadBalancerIds"
                }
              ]
            }
          ]
        },
        "BackendServerList": {
          "Fn::If": [
            "IsCreateVpc",
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupWithVpc",
                "InstanceIds"
              ]
            },
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupNoVpc",
                "InstanceIds"
              ]
            }
          ]
        },
        "BackendServerWeightList": {
          "Fn::Split": [
            ",",
            {
              "Ref": "BackendServerWeightList"
            }
          ]
        }
      }
    },
    "BackendServerAttachment2-2": {
      "Type": "ALIYUN::SLB::BackendServerAttachment",
      "Condition": "IsAttachment2",
      "Properties": {
        "LoadBalancerId": {
          "Fn::Select": [
            "1",
            {
              "Fn::Split": [
                ",",
                {
                  "Ref": "LoadBalancerIds"
                }
              ]
            }
          ]
        },
        "BackendServerList": {
          "Fn::If": [
            "IsCreateVpc",
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupWithVpc",
                "InstanceIds"
              ]
            },
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupNoVpc",
                "InstanceIds"
              ]
            }
          ]
        },
        "BackendServerWeightList": {
          "Fn::Split": [
            ",",
            {
              "Ref": "BackendServerWeightList"
            }
          ]
        }
      }
    },
    "BackendServerAttachment3-1": {
      "Type": "ALIYUN::SLB::BackendServerAttachment",
      "Condition": "IsAttachment3",
      "Properties": {
        "LoadBalancerId": {
          "Fn::Select": [
            "0",
            {
              "Fn::Split": [
                ",",
                {
                  "Ref": "LoadBalancerIds"
                }
              ]
            }
          ]
        },
        "BackendServerList": {
          "Fn::If": [
            "IsCreateVpc",
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupWithVpc",
                "InstanceIds"
              ]
            },
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupNoVpc",
                "InstanceIds"
              ]
            }
          ]
        },
        "BackendServerWeightList": {
          "Fn::Split": [
            ",",
            {
              "Ref": "BackendServerWeightList"
            }
          ]
        }
      }
    },
    "BackendServerAttachment3-2": {
      "Type": "ALIYUN::SLB::BackendServerAttachment",
      "Condition": "IsAttachment3",
      "Properties": {
        "LoadBalancerId": {
          "Fn::Select": [
            "1",
            {
              "Fn::Split": [
                ",",
                {
                  "Ref": "LoadBalancerIds"
                }
              ]
            }
          ]
        },
        "BackendServerList": {
          "Fn::If": [
            "IsCreateVpc",
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupWithVpc",
                "InstanceIds"
              ]
            },
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupNoVpc",
                "InstanceIds"
              ]
            }
          ]
        },
        "BackendServerWeightList": {
          "Fn::Split": [
            ",",
            {
              "Ref": "BackendServerWeightList"
            }
          ]
        }
      }
    },
    "BackendServerAttachment3-3": {
      "Type": "ALIYUN::SLB::BackendServerAttachment",
      "Condition": "IsAttachment3",
      "Properties": {
        "LoadBalancerId": {
          "Fn::Select": [
            "2",
            {
              "Fn::Split": [
                ",",
                {
                  "Ref": "LoadBalancerIds"
                }
              ]
            }
          ]
        },
        "BackendServerList": {
          "Fn::If": [
            "IsCreateVpc",
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupWithVpc",
                "InstanceIds"
              ]
            },
            {
              "Fn::GetAtt": [
                "EcsInstanceGroupNoVpc",
                "InstanceIds"
              ]
            }
          ]
        },
        "BackendServerWeightList": {
          "Fn::Split": [
            ",",
            {
              "Ref": "BackendServerWeightList"
            }
          ]
        }
      }
    }
  },
  "Outputs": {
    "EcsInstanceIds": {
      "Description": "所有ECS实例的ID。",
      "Value": {
        "Fn::If": [
          "IsCreateVpc",
          {
            "Fn::GetAtt": [
              "EcsInstanceGroupWithVpc",
              "InstanceIds"
            ]
          },
          {
            "Fn::GetAtt": [
              "EcsInstanceGroupNoVpc",
              "InstanceIds"
            ]
          }
        ]
      }
    },
    "LoadBalancerIp": {
      "Condition": "IsCreateSlb",
      "Description": "SLB实例的IP。",
      "Value": {
        "Fn::GetAtt": [
          "LoadBalancer",
          "IpAddress"
        ]
      }
    },
    "EcsPublicIps": {
      "DependsOn": "NotUseVpc",
      "Description": "所有ECS实例的公网IP列表",
      "Value": {
        "Fn::If": [
          "IsCreateVpc",
          "Vpc类型的ECS实例没有公网IP",
          {
            "Fn::GetAtt": [
              "EcsInstanceGroupNoVpc",
              "PublicIps"
            ]
          }
        ]
      }
    },
    "EcsPrivateIps": {
      "Description": "所有ECS实例的私网IP列表。",
      "Value": {
        "Fn::If": [
          "IsCreateVpc",
          {
            "Fn::GetAtt": [
              "EcsInstanceGroupWithVpc",
              "PrivateIps"
            ]
          },
          {
            "Fn::GetAtt": [
              "EcsInstanceGroupNoVpc",
              "InnerIps"
            ]
          }
        ]
      }
    },
    "EcsHostNames": {
      "Description": "所有ECS实例的主机名称列表。",
      "Value": {
        "Fn::If": [
          "IsCreateVpc",
          {
            "Fn::GetAtt": [
              "EcsInstanceGroupWithVpc",
              "HostNames"
            ]
          },
          {
            "Fn::GetAtt": [
              "EcsInstanceGroupNoVpc",
              "HostNames"
            ]
          }
        ]
      }
    }
  }
}