What is the exact signal being sent? How can the instance (Linux in this case) handle it?
When you terminate an instance-store pv instance through the AWS console or the API, what "signal" does it receive so it knows it has to gracefully shut down?
First guess would be ACPI, but on boot Linux reports
ACPI in unprivileged domain disabled
ACPI: Interpreter disabled.
In a Linux system consisting of a bootloader, the kernel and an initramfs (no block devices, no other root filesystem):
Is it possible to make the initramfs read-only once expanded into memory?