amazon-web-services - cloudformation windows userdata cfn-init.exe 行尾问题

Question

通过添加一些 cfn-init 来从 S3 存储桶请求数据。我相信我从 powershell 调用 cfn-init.exe 时遇到语法问题，但似乎无法找到位置。该结构取自Bootstrapping AWS CloudFormation Windows Stacks AWS Example 。我还尝试根据 AWS cfn-init documentation 的 bash 结构进行调整但没有成功。

              "UserData": {"Fn::Base64": {"Fn::Join": ["\n", [
                "<powershell>",
                ...
                "cfn-init.exe -v -s", { "Ref" : "AWS::StackName" },
                " -r EC2Instance",
                "</powershell>"

        "Metadata" : {
            "AWS::CloudFormation::Init" : {
                "config": {
                    "files" : {
                        "C:\\chef\\validator.pem" : {
                            "source" : "https://s3.amazonaws.com/dtcfstorage/validator.pem",
                            "authentication" : "s3creds"
                        }
                    }
                },
                    "AWS::CloudFormation::Authentication" : {
                        "s3creds" : {
                            "type" : "S3",
                            "roleName" : "awss3chefkeyaccess"
                        }
                    }
                }
            }

cfn-init.exe 正在运行，但由于参数传递到新行而出错:

2018/05/21 15:35:08Z: Message: The errors from user scripts: Usage: cfn-init.exe [options] or: cfn-init.exe [options] or: cat | cfn-init.exe [options] -

cfn-init.exe: error: -s option requires an argument cloudinittest : The term 'cloudinittest' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. At C:\Windows\TEMP\UserScript.ps1:30 char:1 + cloudinittest + ~~~~~~~~~~~~~ + CategoryInfo : ObjectNotFound: (cloudinittest:String) [], CommandNotFoundException + FullyQualifiedErrorId : CommandNotFoundException

-r : The term '-r' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. At C:\Windows\TEMP\UserScript.ps1:31 char:2 + -r EC2Instance + ~~ + CategoryInfo : ObjectNotFound: (-r:String) [], CommandNotFoundException + FullyQualifiedErrorId : CommandNotFoundException

Answer 1

这是因为您是在顶部使用\n 加入的。如果您在同一行上键入一些参数，则 join 函数的每个参数都将被换行事件分隔!因此，您的命令 cfn-init 已被解释为:

cfn-init.exe -v -s
stack-name
 -r EC2Instance
...

由于线路已损坏，该命令无法正常运行。因此，您可以通过空格字符加入。您可以尝试用以下内容替换上面的内容:

{"Fn::Join": [" ", ["cfn-init.exe -v -s", {"Ref":"AWS::StackName"},
              "-r EC2Instance"]}