AWS CDK ec2.Instance userData....不持久:(

Question

我正在尝试使用 AWS CDK 启动 ec2 实例，在大多数情况下它工作得很好，但我希望 userData 能够持久保存，以便它在每次启动时运行...令人烦恼的是，这没有记录在案（在我能找到的任何地方），而且我只是不知道在哪里/如何定义它。下面是我的代码，可以工作，但因为用户数据是由

forWindows()

我不能只添加

xxx.addCommands('<persist>true</persist>')

因为 forWindows() 将代码放在标签中...

// Instance details
const ssmaUserData = UserData.forWindows()
ssmaUserData.addCommands('mkdir -p C:/helloworld; ');

const ec2Instance = new ec2.Instance(this, 'SdkInstance', {
  vpc,
  instanceType: ec2.InstanceType.of(ec2.InstanceClass.T3, ec2.InstanceSize.NANO),
  machineImage: awsAMI,
  securityGroup: mySecurityGroup,
  vpcSubnets: {subnetType: ec2.SubnetType.PUBLIC},
  keyName: "EC2Connect",
  userData: ssmaUserData
});

我尝试使用

ssmaUserData.addOnExitCommands("<persist>true</persist>")

及其变体，但没有成功，有人知道如何完成此操作吗？

下面的日志表明这不是持久运行...

2021/03/11 12:56:51Z: Userdata execution begins
2021/03/11 12:56:51Z: Zero or more than one <persist> tag was not provided
2021/03/11 12:56:51Z: Unregistering the persist scheduled task
2021/03/11 12:56:55Z: Zero or more than one <runAsLocalSystem> tag was not provided
2021/03/11 12:56:55Z: Zero or more than one <script> tag was not provided
2021/03/11 12:56:55Z: Zero or more than one <powershellArguments> tag was not provided
2021/03/11 12:56:55Z: <powershell> tag was provided.. running powershell content
2021/03/11 13:08:34Z: Userdata execution begins
2021/03/11 13:08:34Z: Zero or more than one <persist> tag was not provided
2021/03/11 13:08:34Z: Unregistering the persist scheduled task
2021/03/11 13:08:37Z: Zero or more than one <runAsLocalSystem> tag was not provided
2021/03/11 13:08:37Z: Zero or more than one <script> tag was not provided
2021/03/11 13:08:37Z: Zero or more than one <powershellArguments> tag was not provided
2021/03/11 13:08:37Z: <powershell> tag was provided.. running powershell content
2021/03/11 13:08:42Z: Message: The output from user scripts: 

Answer 1

明白了！因此，每当我使用AWS有详细记录的

UserData.forWindows()

时，它都会自动添加

<PowerShell>

标签，这意味着如果我定义了

<Persist>

，它将包含该标签...为了解决这个问题，我需要使用

UserData.custom() 

相反。我已经测试了下面的代码，它运行得很好！

const script = `
<powershell>
  Start-Transcript -OutputDirectory C:/
  Write-Output HelloWorld
  Stop-Transcript
</powershell>
<persist>true</persist>
`;

const ssmaUserData = UserData.custom(script)

const ec2Instance = new ec2.Instance(this, 'SdkInstance', {
  vpc,
  instanceType: ec2.InstanceType.of(ec2.InstanceClass.T3, ec2.InstanceSize.NANO),
  machineImage: awsAMI,
  securityGroup: mySecurityGroup,
  vpcSubnets: {subnetType: ec2.SubnetType.PUBLIC},
  keyName: "EC2Connect",
  userData: ssmaUserData,
});

Answer 2

为了避免将所有脚本写入字符串中，您可以使用提供的方法，特别是如果您想做 S3 下载之类的事情。

完成用户数据后，只需获取脚本并附加标志即可。

示例（在 python 中，但可以在 typescript 中以相同的方式完成）：

    instance_userdata = ec2.UserData.for_windows()
    #... do lots os actions like: instance_userdata.add_s3_download_command(...)

    data_script = instance_userdata.render()
    #https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/ec2-windows-user-data.html#user-data-execution
    data_script += "<persist>true</persist>"
    persistent_userdata = ec2.UserData.custom(data_script)

Answer 3

您是否尝试过添加 userDataCausesReplacement: true 我之前也遇到过同样的问题，添加 userDataCausesReplacement 就可以了。

// Instance details
const ssmaUserData = UserData.forWindows()
ssmaUserData.addCommands('mkdir -p C:/helloworld; ');

const ec2Instance = new ec2.Instance(this, 'SdkInstance', {
  vpc,
  instanceType: ec2.InstanceType.of(ec2.InstanceClass.T3, ec2.InstanceSize.NANO),
  machineImage: awsAMI,
  securityGroup: mySecurityGroup,
  vpcSubnets: {subnetType: ec2.SubnetType.PUBLIC},
  keyName: "EC2Connect",
  userData: ssmaUserData,
  userDataCausesReplacement: true
});