setup-ovs.sh

#!/usr/bin/env bash

set -ex

rm -rf /etc/NetworkManager/system-connections/*

# Get the location of the NetworkManager config files
NMPATH=$(NetworkManager --print-config | sed -nr "/^\[keyfile\]/ { :l /^path[ ]*/ { s/.*=[ ]*//; p; q;}; n; b l;}")

if [[ ! -f /boot/mac_addresses ]] ; then
  echo "no mac address configuration file found .. exiting"
  exit 1
fi

# Store the location of the NM config files
if [[ ! -d $NMPATH ]]; then
 NMPATH=/etc/NetworkManager/system-connections
fi

# Copy the config files from stored location to NM settings folder
if [[ -d /var/ovsbond ]]; then
  echo "Loading OVS old profile"
  cp -r /var/ovsbond/*  $NMPATH
  systemctl restart NetworkManager
fi

if [[ $(nmcli conn | grep -c ovs) -eq 0 ]]; then
  echo "configure ovs bonding"
  ovs-vsctl --if-exists del-br brcnv
  primary_mac=$(cat /boot/mac_addresses | awk -F= '/PRIMARY_MAC/ {print $2}')
  secondary_mac=$(cat /boot/mac_addresses | awk -F= '/SECONDARY_MAC/ {print $2}')

  default_device=""
  secondary_device=""
  profile_name=""
  secondary_profile_name=""

  for dev in $(nmcli device status | awk '/ethernet/ {print $1}'); do
    dev_mac=$(nmcli -g GENERAL.HWADDR dev show $dev | sed -e 's/\\//g' | tr '[A-Z]' '[a-z]')
    case $dev_mac in
      $primary_mac)
        default_device=$dev
        profile_name=$(nmcli -g GENERAL.CONNECTION dev show $dev)
        ;;
      $secondary_mac)
        secondary_device=$dev
        secondary_profile_name=$(nmcli -g GENERAL.CONNECTION dev show $dev)
        ;;
      *)
        ;;
     esac
  done
  echo -e "default dev: $default_device ($profile_name)\nsecondary dev: $secondary_device ($secondary_profile_name)"

  mac=$(sudo nmcli -g GENERAL.HWADDR dev show $default_device | sed -e 's/\\//g')

  # make bridge
  nmcli conn add type ovs-bridge conn.interface brcnv con-name ovs-bridge-brcnv
  nmcli conn add type ovs-port conn.interface brcnv-port master brcnv
  nmcli conn add type ovs-interface con-name ovs-brcnv-iface conn.interface brcnv master brcnv-port ipv4.method auto ipv4.dhcp-client-id "mac" connection.autoconnect no 802-3-ethernet.cloned-mac-address $mac

  # make bond
  nmcli conn add type ovs-port conn.interface bond0 master brcnv ovs-port.bond-mode balance-slb con-name ovs-slave-bond0
  nmcli conn add type ethernet conn.interface $default_device master bond0 con-name ovs-slave-1
  nmcli conn add type ethernet conn.interface $secondary_device master bond0 con-name ovs-slave-2
  nmcli conn down "$profile_name" || true
  nmcli conn mod "$profile_name" connection.autoconnect no || true
  nmcli conn down "$secondary_profile_name" || true
  nmcli conn mod "$secondary_profile_name" connection.autoconnect no || true
  if ! nmcli conn up ovs-brcnv-iface; then
      nmcli conn up "$profile_name" || true
      nmcli conn mod "$profile_name" connection.autoconnect yes
      nmcli conn up "$secondary_profile_name" || true
      nmcli conn mod "$secondary_profile_name" connection.autoconnect yes
      nmcli conn delete $(nmcli c show |grep ovs-cnv |awk '{print $1}') || true
  else
      nmcli conn mod ovs-brcnv-iface connection.autoconnect yes
      nmcli conn up ovs-slave-2
      # Remove Old NM config files and copy the new-ones
      rm -rf /var/ovsbond
      cp -r $NMPATH /var/ovsbond || true
  fi
else
    echo "ovs bridge already present"
    for c in ovs-bridge-brcnv ovs-slave-bond0 ovs-slave-brcnv-port ovs-slave-1 ovs-slave-2 ovs-brcnv-iface; do nmcli c up $c; done
fi