AWS user-data is not getting executed by terraform

[Bubunia Patra]

Hi all,

I have created the AMI through packer and launching the AMI through terraform. I have also user-data which runs during the bootstrap of the EC2 instance. I noticed that user-data contents is not getting called from terraform as when I created the file inside the user-data script to add the debug logs I noticed the file is not created nor I added some statements i could not see anything it. In the /var/log/cloud-init.log there is no data.

Any idea how can I debug and fix it? 

Regards

Pradeep

[Brian Lalor]

Can you provide your Terraform config?  Or a representative sample?  Also check /var/lib/cloud/instance (I think…) where you should see what user data, if any, is getting onto the instance.

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Brian Lalor

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[Bill Anderson]

Terraform doesn't run your user-data script, cloud-init does. it may seem inconsequential, but the distinction is important (after all, your cloud init config could skip user data scripts). You mention you build the AMI with Packer, is there where you are installing the user-data script? If so you'll probably be better off on the Packer list (and the answer will likely involve running Packer in debug mode so you can step through the sequence and verify each step to see why it doesn't get added to the AMI). If not, the terraform config will be crucial for us to help.

Cheers,

Bill

[Michael Smith]

Does your AMI install python 3.6?  I ran into a similar issue with an AMI I created.  I didn't realize cloud init depended on python.

[shiva dontu]

As per my experience with Userdata and AMIs,  Userdata will be executed by ec2-user, and i am assuming to run/install software, Ec2-user mush have sudo permissions.

If you your AMI is created from AWS AMIs, Ec2-user has full permissions including sudo. so User data will be executed

If your AMI is a snapshot of the machine ( lift and Shifted from On-Prem), Ec2-user will not be available, So make sure Ec2-user is setup with sudo permissions.

Hope this resolve the issue.

Also Please let me know if any of you were able to resolve the issue, if yes, could you please suggest me how this issue was resolved.

-Shiva

[hmun...@gmail.com]

Hi Pradeep, 

Declare userdata template as data source and use it as user_data in your ec2 instance resource or autoscaling resources. then your instance will use the bootstrap the userdata. Hope this helps 

declare userdata as data source

-------------------------------------------

data "template_file" "user_data" {

  template = "${file("userdata.tpl")}"

}

under ec2 or autoscaling resource 

----------------------------------------------

user_data    =  "${data.template_file.user_data.rendered}"

Thank you 

--Hima