flannel save/restore

flannel-restore.sh

#!/bin/bash

# Restore Flannel
DEVICE=flannel.1

# Load Config
source /tmp/.flannel-save || exit

# Restore link
ip l a "$DEVICE" type vxlan id 1 local 192.168.210.252 dstport 8472 dev wg0
ip l set dev "$DEVICE" address "$MACADDR"
ip a a dev "$DEVICE" "${IPADDR}"
ip l set dev "$DEVICE" up

# Restore arp/route
echo "$NETWORKS" | while read network;
do
  LINK="$(echo "$network" | awk '{print $2}')"
  INET="$(echo "$network" | awk '{print $1}')"
  ip neigh add "$INET" dev "$DEVICE" lladdr "$LINK"
  ip r a "${INET}/24" dev "$DEVICE" via "$INET" onlink
done

# Restore fdb
echo "$FDBS" | while read fdb;
do
  LINK="$(echo "$fdb" | awk '{print $1}')"
  INET="$(echo "$fdb" | awk '{print $2}')"
  bridge fdb replace "$LINK" dev "$DEVICE" dst "$INET" self
done

flannel-save.sh

#!/bin/bash

# Save Flannel
DEVICE=flannel.1

# Prepare save file
rm -f /tmp/.flannel-save
save_conf() {
  local KEY="$1"
  local VAL="$2"
  echo "$KEY='$VAL'" >> /tmp/.flannel-save
}

# Save Device Address
IPRAW="$(ip a show "$DEVICE")"
MACADDR="$(echo "$IPRAW" | grep "link/ether" | awk '{print $2}')"
IPADDR="$(echo "$IPRAW" | grep "inet " | awk '{print $2}')"

save_conf MACADDR "$MACADDR"
save_conf IPADDR "$IPADDR"

# Save networks
NETWORKS="$(ip neigh show dev "$DEVICE" | grep PERMANENT | awk '{print $1" "$3;}')"
save_conf NETWORKS "$NETWORKS"

# Save Forwards
FDBS="$(bridge fdb show dev "$DEVICE" | awk '{print $1" "$3;}')"
save_conf FDBS "$FDBS"