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fix: preserve DNS resolution after IP migration to br-external

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When setup-ovn.sh migrates the WAN IP from a physical NIC to
br-external, systemd-resolved loses its DNS association (DNS servers
are per-interface). This breaks hostname resolution for everything
on the host — git, apt, curl, SSH all fail.

Now captures DNS config from the original interface before migration
and re-associates it with br-external via resolvectl. Falls back to
8.8.8.8 if no DNS was configured on the original interface.
This commit is contained in:
Ben Duncan
2026-03-20 06:57:18 +00:00
parent bb9e8db386
commit 665093343c
1 changed files with 21 additions and 0 deletions
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scripts/setup-ovn.sh
+21
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@@ -205,11 +205,32 @@ if [ "$EXTERNAL_BRIDGE" = true ]; then
WAN_IP=$(ip -4 addr show dev "$EXTERNAL_IFACE" 2>/dev/null | awk '/inet /{print $2}' | head -1)
if [ -n "$WAN_IP" ]; then
WAN_GW=$(ip -4 route show default dev "$EXTERNAL_IFACE" 2>/dev/null | awk '{print $3}' | head -1)
# Capture DNS config from the original interface before migration
WAN_DNS=$(resolvectl dns "$EXTERNAL_IFACE" 2>/dev/null | awk '{for(i=2;i<=NF;i++) printf $i" "}' | xargs)
sudo ip addr del "$WAN_IP" dev "$EXTERNAL_IFACE" 2>/dev/null || true
sudo ip addr add "$WAN_IP" dev br-external
if [ -n "$WAN_GW" ]; then
sudo ip route add default via "$WAN_GW" dev br-external 2>/dev/null || true
fi
# Fix DNS: systemd-resolved associates DNS servers with interfaces.
# After IP migration, the resolver no longer knows which interface
# reaches the DNS server. Point it at br-external.
if [ -n "$WAN_DNS" ]; then
sudo resolvectl dns br-external $WAN_DNS 2>/dev/null || true
echo " Migrated DNS ($WAN_DNS) to br-external"
else
# Fallback: set Google DNS on br-external
sudo resolvectl dns br-external 8.8.8.8 2>/dev/null || true
echo " Set fallback DNS (8.8.8.8) on br-external"
fi
# Also set the search domain if it existed
WAN_DOMAIN=$(resolvectl domain "$EXTERNAL_IFACE" 2>/dev/null | awk '{for(i=2;i<=NF;i++) printf $i" "}' | xargs)
if [ -n "$WAN_DOMAIN" ]; then
sudo resolvectl domain br-external $WAN_DOMAIN 2>/dev/null || true
fi
echo " Migrated $WAN_IP from $EXTERNAL_IFACE to br-external"
fi