How to run a command at EC2 Instance RE-boot?

Question

I had a project where I need to run a command at EC2 reboot. I found only information about User Data but that works only at first launch which is not exactly what I needed. I need a command to run everytime I connect to the machine.

Answer 1

You can store a shell script in this directory:

/var/lib/cloud/scripts/per-boot/

It will be automatically run after every boot. (This is done by cloud-init, which also runs User Data scripts.)