diff --git a/board/czechlight/common/hack-systemd-rw-root.sh b/board/czechlight/common/hack-systemd-rw-root.sh
deleted file mode 100755
index 4416b20..0000000
--- a/board/czechlight/common/hack-systemd-rw-root.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/sh
-
-sed -i 's|^\(/dev/root.*\) ro|\1 rw|' ${TARGET_DIR}/etc/fstab
diff --git a/board/czechlight/common/kconfig b/board/czechlight/common/kconfig
index d2196e7..87a0c85 100644
--- a/board/czechlight/common/kconfig
+++ b/board/czechlight/common/kconfig
@@ -59,3 +59,6 @@
 # Watchdog bits
 CONFIG_WATCHDOG_NOWAYOUT=y
 CONFIG_WATCHDOG_SYSFS=y
+
+# protecting /etc
+CONFIG_OVERLAY_FS=y
diff --git a/board/czechlight/common/overlay/.ov/.keep b/board/czechlight/common/overlay/.ov/.keep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/board/czechlight/common/overlay/.ov/.keep
diff --git a/board/czechlight/common/overlay/etc/fstab b/board/czechlight/common/overlay/etc/fstab
new file mode 100644
index 0000000..92681bd
--- /dev/null
+++ b/board/czechlight/common/overlay/etc/fstab
@@ -0,0 +1,3 @@
+/dev/root / auto ro 0 1
+tmpfs /var tmpfs mode=1777 0 0
+tmpfs /.ov tmpfs mode=0700 0 0
diff --git a/board/czechlight/common/overlay/usr/lib/systemd/system/etc-overlay.service b/board/czechlight/common/overlay/usr/lib/systemd/system/etc-overlay.service
new file mode 100644
index 0000000..625e72b
--- /dev/null
+++ b/board/czechlight/common/overlay/usr/lib/systemd/system/etc-overlay.service
@@ -0,0 +1,18 @@
+[Unit]
+Description=Overlay filesystem over /etc
+DefaultDependencies=no
+Conflicts=umount.target
+Before=local-fs.target umount.target
+After=swap.target \x2eov.mount
+
+[Service]
+Type=oneshot
+ExecStart=/bin/mkdir /.ov/etc-u
+ExecStart=/bin/mkdir /.ov/etc-w
+# Moving /etc/machine-id. Cannot --move, we have to --bind.
+ExecStart=/bin/touch /.ov/etc-machine-id
+ExecStart=/bin/mount --bind /etc/machine-id /.ov/etc-machine-id
+ExecStart=/bin/umount /etc/machine-id
+ExecStart=/bin/mount overlay -t overlay /etc -olowerdir=/etc,upperdir=/.ov/etc-u,workdir=/.ov/etc-w
+ExecStart=/bin/mount --bind /.ov/etc-machine-id /etc/machine-id
+ExecStart=/bin/umount /.ov/etc-machine-id
diff --git a/board/czechlight/common/overlay/usr/lib/systemd/system/local-fs.target.wants/etc-overlay.service b/board/czechlight/common/overlay/usr/lib/systemd/system/local-fs.target.wants/etc-overlay.service
new file mode 120000
index 0000000..081d54a
--- /dev/null
+++ b/board/czechlight/common/overlay/usr/lib/systemd/system/local-fs.target.wants/etc-overlay.service
@@ -0,0 +1 @@
+../etc-overlay.service
\ No newline at end of file
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index 305370a..863bed3 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -12,7 +12,6 @@
 BR2_TARGET_GENERIC_GETTY_BAUDRATE_115200=y
 # BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW is not set
 BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/overlay/ $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/overlay/"
-BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/hack-systemd-rw-root.sh"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
 BR2_ROOTFS_POST_SCRIPT_ARGS="-c $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/genimage.cfg"
 BR2_LINUX_KERNEL=y