cloud-init script is not being run on Amazon Linux 2023

Question

Here's my very simple test script that I want to run on ec2 launch via cloud-init using terraform.

```
data "cloudinit_config" "cloudinit" {
  gzip          = false
  base64_encode = false

part {
    content_type = "text/x-shellscript"
    content      = <) failed
Cloud-init v. 22.2.2 finished at Thu, 04 Jul 2024 23:31:19 +0000. Datasource DataSourceEc2.  Up 11.77 seconds
```

shortcircuit · Accepted Answer

With some hints from folks on SO, I was able to solve my issue. Posting here for others.

Looks like Amazonlinux:2023 needs the script interpreter shebang which was probably optional for Amazonlinux2. My script had incorrect EOT and an extra space that was effectively rendering a missing shebang. Here's the fixed code:

```
data "cloudinit_config" "cloudinit" {
  gzip          = false
  base64_encode = false

part {
    content_type = "text/x-shellscript"
    content      = <<-EOT
      #!/bin/bash
      echo "Running User Data on $HOSTNAME"
      EOT
    filename     = "cloudinit.sh"
  }
}
```

shortcircuit · Answer

I can see that on both amazon linux versions, terraform is attaching the following multipart user data which is identical so clearly nothing different about terraform setup either. I tried some older versions of amazon linux 2023 too but no luck:

```
Content-Type: multipart/mixed; boundary="MIMEBOUNDARY"
MIME-Version: 1.0

--MIMEBOUNDARY
Content-Disposition: attachment; filename="cloudinit.sh"
Content-Transfer-Encoding: 7bit
Content-Type: text/x-shellscript
Mime-Version: 1.0

# !/bin/bash
      echo "Running User Data on $HOSTNAME"

--MIMEBOUNDARY--

```

cloud-init script is not being run on Amazon Linux 2023

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