Cloud-init per-boot script doing nothing

2
votes

I am new to cloud-init, my final goal is to run an R script each time an EC2 Spot Instance becomes active, but in order to test it I created an on-demand Ubuntu 12.04 instance and created a simple script but nothing happens after reboot. Here are the steps I took:

  • Launched the new Ubunut 12.04 instance
  • Navigate to /var/lib/cloud/scripts/per-boot
  • sudo vi script.sh
  • Added the following code:

#!/bin/sh
echo "test"

  • sudo reboot

At this point I thought I should see a "test" print when the instance reboots, but there is nothing there. I went to take a look at /var/log/cloud-init.log but there is no error or anything out of the ordinary.

I am clearly missing something so any tip in the right direction will be much appreciated!

Thanks!

3
ubuntuamazon-ec2cloud-init
I finally managed to do this using rc.local, this doesn't answer my original question as I still don't know why the script was not loading, but it might help someone in the same situation as mine – JordanBelf

3 Answers

2
votes

It won't run unless the scripts user is set to always run. See this answer for more details (and for instructions on how to get scripts to run on reboot, generally).

2
votes

If we want to debug the user-data in cloud-init, we can try the following steps:

  1. rm -rf /var/lib/cloud/*
  2. cloud-init init
  3. cloud-init modules -m final

With above commands, the cloud-init is re-run. And we can check the cloud-init.log under /var/log/cloud-init.log to check if it is successfully exec.

2
votes

Looked at the source code, the script must be executable. This'll make it work

sudo chmod 744 script.sh