commit 871c23

2026-07-24 21:48:24 admin: tmpfs overlay

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`raspberry pi.md` ..
@@ 51,3 51,21 @@

	WARNING: Erase the above disk(s) and continue? (y/n) [n] y
	```
+
+	## Read-only root filesystem with tmpfs overlay
+	Makes root filesystem read-only reducing wear on SD card. Simply add `overlaytmpfs=yes` to `/boot/cmdline.txt`:
+	```
+	sed -i 's/$/ overlaytmpfs=yes/' /boot/cmdline.txt
+	reboot
+	```
+
+	Make root writable again:
+	```
+	sed -i 's/ overlaytmpfs=yes//' /boot/cmdline.txt
+	reboot
+	```
+
+	# References
+	- https://wiki.alpinelinux.org/wiki/Raspberry_Pi
+	- https://wiki.alpinelinux.org/wiki/Installation_on_a_headless_host
+	- https://wiki.alpinelinux.org/wiki/OverlayFS#Immutable_root_with_tmpfs_overlay