I am launching multiple ( more than 100 EC2 instances ) from a previously set AMI. This AMI is made from an Ubuntu 20.04 AMI. Everything that is required for the work is already satisfied in AMI. Now I just want execute an user-script while launching EC2 using AMI. But the problem is coming that for 2-3% of the Ec2 instances are not able to execute the userscript , othere 97-98% of launched instances are running perfectly fine. These instances are being launched using spot requests so they are exactly similar in configurations. I am able to ssh into the faulty instances too . Last few lines of /var/log/cloud-init-output.log looks something like this:
Cloud-init v. 22.2-0ubuntu1~22.04.3 running 'modules:config' at Mon, 20 Feb 2023 08:21:36 +0000. Up 41.66 seconds.
Cloud-init v. 22.2-0ubuntu1~22.04.3 running 'modules:final' at Mon, 20 Feb 2023 08:21:39 +0000. Up 45.11 seconds.
Cloud-init v. 22.2-0ubuntu1~22.04.3 finished at Mon, 20 Feb 2023 08:21:39 +0000. Datasource DataSourceNone. Up 45.51 seconds
2023-02-20 08:21:39,953 - cc_final_message.py[WARNING]: Used fallback datasource
/var/lib/cloud/instance normally points to the a folder in with the name of instance id but in this faulty case , it is pointing at this -> /var/lib/cloud/instances/iid-datasource-none
For Faulty instance:
ubuntu@ip-172-31-21-43:/var/lib/cloud/instances/iid-datasource-none$ cat datasource
DataSourceNone: DataSourceNone
For healthy instance:
ubuntu@ip-172-31-20-76:/var/lib/cloud/instances/i-0c964c834bf91ce81$ cat datasource
DataSourceEc2Local: DataSourceEc2Local
Now I am not able to figure out that why the userscript is being executed in most of the instances but these few 2-3%.
