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