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I have an industrial computer (read: no keyboard/mouse/monitor except during maintenance) which will control some machinery. The operating system will be Linux (I would prefer OpenSuSE, but it's not a strict requirement). The software doesn't need to store anything between successive launches.
I want the end user to be able to just power off the computer at any time he wants, without sending a shutdown -h now
command or the like, and then waiting for the computer to shut down. To achieve that, I want to use union mount, probably aufs, so that the SSD with root filesystem is accessed only for reading and is NEVER, EVER written to.
The Live USB stick article on OpenSuSE wiki says to just dd
the *.iso with the OS on the flash drive. I guess that will work with SSD, too. But I don't want the SSD to have the ISO 9660 filesystem. Can I just install OpenSuSE properly on say ext2/3/4 or XFS or whatever and then lock the SSD from writing, redirecting all write requests to a RAM disc through aufs
?
Could you please give me a hint on how to implement this?