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have an instance store volume(faster/cheaper) which we would like to create a volume(mkfs) when the instance is stopped and started via systemd. Is the best way for this is to have a shell script and have a systemd service call this?

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It's not 100% clear to me what you want to achieve. Are you looking to instantiate (mkfs) a disk when an EC2 instance is created/booted? If that is the case, you should look into Cloud-init to mkfs and mount your disks.

  • Yes, that is what I would like to do. Right now I have a shell script that runs mkfs.ext4 /dev/xvdb and is called by a systemd.service which I created – shaolinLLama Apr 9 at 11:51
  • I think you should execute the script with cloud-init in that case. You might want to build in a loop to wait for the device to become available after launch. – Duologic Apr 9 at 20:18

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