additional_userdata script needs '#!/bin/sh at top to work with AL2023 AMI

[canpmh]

Terraform Version Details

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Terraform Variable File Details

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Steps to Reproduce

update to an AMI using AL2023 for the compute node pool

include "custom_data" = "files/custom-data/additional_userdata.sh" in compute node pool definition within terraform.tfvars

Expected Behavior

NVME drives should mount and be available at the /nvme/disk symlink.

Actual Behavior

cloud-init won't run the scripts-user module during config, it fails with this error

Exec format error. Missing #! in script

Googling a bit I came across this post,

which suggests we simply need to add #!/bin/sh to the top of our additional_userdata.sh script in order for cloud-init to execute it. This wasn’t necessary on AL2 images, but apparently is needed for AL2023.

Additional Context

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References

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