小编gre*_*egn的帖子

如何在 LaunchTemplate 中使用 cfn-init？这适用于 EC2 实例、自动扩展组中的 ECS 集群。

Metadata实例的部分在哪里，--resource传递给 cnf-init 的内容是什么？

LaunchTemplate:
  Type: AWS::EC2::LaunchTemplate
  Properties:
    LaunchTemplateName: !Sub ${AWS::StackName}-launch-template
    LaunchTemplateData: 
      SecurityGroups: 
        - !Ref DMZSecurityGroup
        - !Ref ECSSecurityGroup
      UserData:
        Fn::Base64:
          !Sub |
            #!/bin/bash -xe
            yum update -y aws-cfn-bootstrap
            /opt/aws/bin/cfn-init -v --stack ${AWS::StackName} --resource ??? --region ${AWS::Region}
            yum -y update

我对元数据的最佳猜测产生了错误：

    Property validation failure: [Encountered unsupported properties in {/LaunchTemplateData}: [Metadata]]

XSL如何使用XSL为XML文档中的每个元素生成唯一的id属性,其中id必须是数字？下面的XLS工作,除了生成的ID是字母数字,我需要数字？

<?xml version='1.0' encoding='utf-8'?>  
<xsl:stylesheet version='1.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'
    xmlns:msxsl='urn:schemas-microsoft-com:xslt' exclude-result-prefixes='msxsl'>  
    <xsl:output method='xml' indent='yes'/>  
    <xsl:template match='*'>  
      <xsl:copy>  
        <xsl:attribute name='ElementID'>  
          <xsl:value-of select='generate-id()'/>  
        </xsl:attribute>  
        <xsl:apply-templates/>  
      </xsl:copy>  
    </xsl:template>    
</xsl:stylesheet>  

谢谢.

如何使用可选参数pls创建电源查询功能？我尝试了各种创建函数语法的排列,目前如下:

let
    fnDateToFileNameString=(inFileName as text, inDate as date, optional inDateFormat as nullable text) => 
    let

        nullCheckedDateFormat = Text.Replace(inDateFormat, null, ""),
        value =     if nullCheckedDateFormat = "" 
            then inFileName
            else Text.Replace(inFileName, inDateFormat, Date.ToText(inDate, inDateFormat ))
    in 
        value
in
    fnDateToFileNameString

我将它传递给一个看起来像的测试:

 = fnDateToFileNameString("XXXXXXXXXXXXXXXXXX", #date(2015, 3, 21), null)

抛出:

"An error occurred in the fnDateToFileNameString" query. Expression.Error: we cannot convert the value null to type Text.
    Details:
    Value=
    Type=Type