| 1 |
On Tue, May 26, 2020 at 1:27 PM Neil Bothwick <neil@××××××××××.uk> wrote: |
| 2 |
|
| 3 |
> On Tue, 26 May 2020 19:14:18 +0100, antlists wrote: |
| 4 |
> |
| 5 |
> > > That's the Gentoo version that I'm using. But I'm looking for a way |
| 6 |
> > > to make it bullet-proof to having the plug pulled. |
| 7 |
> > |
| 8 |
> > Don't use an SD card? Seriously, pulling the power on an SD card has |
| 9 |
> > been known to corrupt it beyond recovery. BUT. |
| 10 |
> |
| 11 |
> Mounting the card with sync will significantly reduce the likelihood of |
| 12 |
> corruption, at a cost of reduced life. |
| 13 |
> |
| 14 |
> > Is the big worry that the home directory will get corrupted etc etc? I |
| 15 |
> > don't know if you can partition an SD card, but look at doing a |
| 16 |
> > kiosk-style install with the OS protected and read-only. Then look at |
| 17 |
> > sticking a loopback device on top of home, so that any changes exist |
| 18 |
> > only in ram, and are lost on shutdown. Hopefully, that means you now |
| 19 |
> > have a system that can boot and run off a write-protected SD card :-) |
| 20 |
> |
| 21 |
> This will mitigate the reduced life as you are hardly writing to the |
| 22 |
> card. Booting from a read-only / has caused problems for me in the past, |
| 23 |
> because of the inability to write to /etc. |
| 24 |
> |
| 25 |
|
| 26 |
|
| 27 |
|
| 28 |
Consider a hybrid approach like how many embedded systems do things. E.g. |
| 29 |
openwrt. |
| 30 |
|
| 31 |
/root is actually a read-only squashfs image, and on top of that there's an |
| 32 |
overlay fs that uses a second partition as it's backing storage. |
| 33 |
|
| 34 |
This way, almost all of your system is purely read-only, but you have the |
| 35 |
ability to store changes to things you need to store changes for. |
Archives