阿里云资源编排Fn::Replace函数_资源编排(ROS)-阿里云帮助中心

调用内部函数Fn::Replace，用新字符串替换原字符串中的子字符串。

函数声明

JSON

{
  "Fn::Replace": [
    {
      "object_key1": "object_value1",
      "object_key2": "object_value2"
    },
    "object_string"
  ]
}

YAML

完整函数的语法。

Fn::Replace:
 - object_oldValue1: object_newValue1
   object_oldValue2: object_newValue2
 - object_string

缩写形式。

!Replace [{'object_oldValue1': 'object_newValue1', 'object_oldValue2': 'object_newValue2'}, object_string]

参数信息

object_oldValue：将要被替换的字符串。
object_newValue：将要替换成的最终字符串。
object_string：包含要被替换的object_oldValue的原字符串。

返回值

被替换后的字符串。

使用示例

该函数常用于UserData、CommandContent脚本的编辑中，例如以下示例将指定脚本中的print替换成echo。

YAML

ROSTemplateFormatVersion: '2015-09-01'
Resources:
  WebServer:
    Type: ALIYUN::ECS::Instance
    Properties:
      ImageId: centos_7_2_64_40G_base_20170222****
      InstanceType: ecs.n1.medium
      SecurityGroupId: sg-94q49****
      Password: MytestPassword****
      IoOptimized: optimized
      VSwitchId: vsw-94vdv****
      VpcId: vpc-949uz****
      SystemDiskCategory: cloud_ssd
      UserData:
        !Replace
          - print: echo
          - !Join
              - ''
              - - |
                  #!/bin/sh
                - |
                  mkdir ~/test_ros
                - |
                  print hello > ~/1.txt

JSON

{
  "ROSTemplateFormatVersion": "2015-09-01",
  "Resources": {
    "WebServer": {
      "Type": "ALIYUN::ECS::Instance",
      "Properties": {
        "ImageId": "centos_7_2_64_40G_base_20170222****",
        "InstanceType": "ecs.n1.medium",
        "SecurityGroupId": "sg-94q49****",
        "Password": "MytestPassword****",
        "IoOptimized": "optimized",
        "VSwitchId": "vsw-94vdv****",
        "VpcId": "vpc-949uz****",
        "SystemDiskCategory": "cloud_ssd",
        "UserData": {
          "Fn::Replace": [
            {
              "print": "echo"
            },
            {
              "Fn::Join": [
                "",
                [
                  "#!/bin/sh\n",
                  "mkdir ~/test_ros\n",
                  "print hello > ~/1.txt\n"
                ]
              ]
            }
          ]
        }
      }
    }
  }
}

函数声明

参数信息

返回值

使用示例

支持的函数