From 3f52fc518feefc5bef8765e9b97c45a376bbb02f Mon Sep 17 00:00:00 2001
From: admin <alec@bryanmail.net>
Date: Thu, 18 Jun 2026 22:44:41 -0700
Subject: [PATCH] Add MTU migration rollback script

---
 scripts/network/mtu_rollback.sh | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 scripts/network/mtu_rollback.sh

diff --git a/scripts/network/mtu_rollback.sh b/scripts/network/mtu_rollback.sh
new file mode 100644
index 0000000..3046be9
--- /dev/null
+++ b/scripts/network/mtu_rollback.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+# ROLLBACK — restore daemon.json to original (no mtu field)
+HOST=$(hostname)
+LOG=/volume1/docker/mtu_migration/${HOST}_rollback.log
+exec >> "$LOG" 2>&1
+echo "[$(date)] $HOST ROLLBACK starting"
+cat > /etc/docker/daemon.json << 'DAEMON'
+{
+  "data-root": "/volume1/docker-root/",
+  "storage-driver": "overlay2",
+  "dns-search": ["."]
+}
+DAEMON
+echo "[$(date)] daemon.json restored: $(cat /etc/docker/daemon.json)"
+systemctl restart docker
+sleep 15
+echo "[$(date)] Docker status: $(systemctl is-active docker)"
+echo "[$(date)] eth0 MTU: $(ip link show eth0 | grep -o 'mtu [0-9]*')"
+touch /volume1/docker/mtu_migration/${HOST}_rollback.done
+echo "[$(date)] $HOST ROLLBACK COMPLETE"