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.

CodePudding user response：

After a little bit of research, I found a very easy solution. You can simply run.

echo "YOUR_COMMAND" >> .bashrc

This works also if you write it in the User Data section when launching your EC2 instance so that you don't have to SSH into it after launch.

Enjoy!

CodePudding user response：

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.)