如何使用 cloudformation 模板中的用户数据将文件从 s3 存储桶复制到 ec2 实例中

Question

I need to be able to copy some files from s3 bucket into ec2 instance during launch time . Is it possible to do so via user data section of the cloudformation template?

Fyi, I have the role attached to the instance to access s3 and I am able to copy files using aws cli but I need to be able to do so via user data inside cloudformation without using aws cli, if possible at all.

Edit--

Object in s3 is publicly accessible at the moment and the instance is using a custom red hat ami.

Answer 1

If the object in Amazon S3 is publicly accessible, you could download it with curl :

curl -o output.file https://my-bucket.s3-us-west-2.amazonaws.com/file.txt

If wget is installed, you could use that instead.

If the object is private, it will require authentication using the role. This will require some form of software to be installed, so it would be simpler to just install the AWS CLI.