如何在AWS Lambda上创建EC2时将脚本传递给UserData字段？

Question

I'm trying to pass a script in Userdata field of a new EC2 instance created by an AWS Lambda (using AWS SDK for Javascript, Node.js 6.10):

 ... var paramsEC2 = { ImageId: 'ami-28c90151', InstanceType: 't1.micro', KeyName: 'myawesomekwy', MinCount: 1, MaxCount: 1, SecurityGroups: [groupname], UserData:'#!/bin/sh \\n echo "Hello Lambda"' }; // Create the instance ec2.runInstances(paramsEC2, function(err, data) { if (err) { console.log("Could not create instance", err); return; } var instanceId = data.Instances[0].InstanceId; console.log("Created instance", instanceId); // Add tags to the instance params = {Resources: [instanceId], Tags: [ { Key: 'Name', Value: 'taggggg' } ]}; ec2.createTags(params, function(err) { console.log("Tagging instance", err ? "failure" : "success"); }); }); ... 

I tried several things like: - create a string and pass the string to the UserData - not working - create a string and encode it to base64 and pass the string to the UserData - not working - paste base64 encoded string - not working

Could you help me understanding how to pass a script in the UserData? The AWS SDK documentation is a bit lacking.

Is it also possible to pass a script put in an S3 bucket to the UserData?

Answer 1

Firstly, base64 encoding is required in your example. Although the docs state that this is done for you automatically, I always need it in my lambda functions creating ec2 instances with user data. Secondly, as of ES6, multi-line strings can make your life easier as long as you add scripts within your lambda function.

So try the following:

var userData= `#!/bin/bash
echo "Hello World"
touch /tmp/hello.txt
`

var userDataEncoded = new Buffer(userData).toString('base64');

var paramsEC2 = {
    ImageId: 'ami-28c90151',
    InstanceType: 't1.micro',
    KeyName: 'AWSKey3',
    MinCount: 1,
    MaxCount: 1,
    SecurityGroups: [groupname],
    UserData: userDataEncoded
};

// Create the instance
// ...