Question

我有一个简单的bash脚本我尝试使用AWS库通过Powershell脚本传递给AWS EC2 ubuntu实例。

#!/bin/bash

apt-get update
apt-get upgrade

下载了对base64中的文件内容进行编码的powershell脚本，并调用启动EC2实例的cmdlet：

$fileContent = Get-Content $UserDataTarget
$fileContentBytes = [System.Text.Encoding]::UTF8.GetBytes($fileContent)
$fileContentEncoded = [System.Convert]::ToBase64String($fileContentBytes)
$MasterInstance = New-EC2Instance -ImageId ami-4c7a3924 -MinCount 1 -MaxCount 1 -KeyName AWSKey -SecurityGroups $SecurityGroup -InstanceType "t1.micro" -UserData $fileContentEncoded

这是来自cloud init log的片段：

Cloud-init v. 0.7.5 running 'modules:final' at Fri, 02 Oct 2015 21:05:24 +0000. Up 33.88 seconds.
/bin/bash: apt-get update apt-get upgrade: No such file or directory
2015-10-02 21:05:24,294 - util.py[WARNING]: Failed running /var/lib/cloud/instance/scripts/part-001 [127]
2015-10-02 21:05:24,298 - cc_scripts_user.py[WARNING]: Failed to run module scripts-user (scripts in /var/lib/cloud/instance/scripts)
2015-10-02 21:05:24,298 - util.py[WARNING]: Running scripts-user (<module 'cloudinit.config.cc_scripts_user' from '/usr/lib/python2.7/dist-packages/cloudinit/config/cc_scripts_user.pyc'>) failed

这是在/ var / lib / cloud / instance / scripts / part-001上的ubuntu实例上加载的用户数据脚本的片段：

#!/bin/bash  apt-get update apt-get upgrade

我尝试使用010 Editor和Cygwin将windows文件转换为linux。我尝试用LF字节替换CRLF字节。结果是相同的：整个bash脚本压缩为1行，删除所有换行符，并且在初始启动时无法加载用户数据脚本。

更新：我已经包含了用于执行换行符转换的两个代码段。两者都是从同行来源（SO）审查。出于某种原因，该脚本仍然显示在linux实例中，没有换行符。

Snippet 1

function ConvertTo-LinuxLineEndings($path) {
        $oldBytes = [io.file]::ReadAllBytes($path)
        if (!$oldBytes.Length) {
            return;
        }
        [byte[]]$newBytes = @()
        [byte[]]::Resize([ref]$newBytes, $oldBytes.Length)
        $newLength = 0
        for ($i = 0; $i -lt $oldBytes.Length - 1; $i++) {
            if (($oldBytes[$i] -eq [byte][char]"`r") -and ($oldBytes[$i + 1] -eq [byte][char]"`n")) {
                continue;
            }
            $newBytes[$newLength++] = $oldBytes[$i]
        }
        $newBytes[$newLength++] = $oldBytes[$oldBytes.Length - 1]
        [byte[]]::Resize([ref]$newBytes, $newLength)
        [io.file]::WriteAllBytes($path, $newBytes)
    }

    ConvertTo-LinuxLineEndings($UserDataTarget)

Snippet 2

try{

    # get the contents and replace line breaks by U+000A
    $contents = [IO.File]::ReadAllText($UserDataSource) -replace "`r`n", "`n"
    # create UTF-8 encoding without signature
    $utf8 = New-Object System.Text.UTF8Encoding $false
    # write the text back
    [IO.File]::WriteAllText($UserDataTarget, $contents, $utf8)
}
catch [Exception]
{
    echo $_.Exception|format-list -force
}

Answer 1

我无法就Powershell代码的外观给出答案，但如果有帮助我可以告诉您Powershell脚本的输出需要什么，所以你需要确认一下当你进入模板时，这就是你在UserData中的结果：

"UserData" : { "Fn::Base64" : { "Fn::Join" : ["", [
            "#!/bin/bash\n\n",
            "apt-get update\n",
            "apt-get upgrade\n"
        ]]}}

Bash脚本作为用户数据文件传递到AWS EC2实例，无法在初始引导时加载

1 个答案: