Synnefo » snf-ganeti

#!/bin/bash

#

# Copyright (C) 2011 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

set -e -u

USAGE_MSG="Usage: $0 {start|stop}"

PATH=$PATH:/sbin:/usr/sbin:/usr/local/sbin

FPING_PACKET_COUNT=5

FPING_PACKET_INTERVAL_MS=200

# Start the master IP

start() {

  case $CLUSTER_IP_VERSION in

    4)

      ARP_COMMAND="arping -q -U -c 3 -I $MASTER_NETDEV -s $MASTER_IP $MASTER_IP"

      ;;

    6)

      ARP_COMMAND="ndisc6 -q r 3 $MASTER_IP $MASTER_NETDEV"

      ;;

    *)

      echo "Invalid cluster IP version specified: $CLUSTER_IP_VERSION" >&2

      exit 1

      ;;

  esac

  # Check if the master IP address is already configured on this machine

  if fping -c $FPING_PACKET_COUNT -p $FPING_PACKET_INTERVAL_MS \

      -S 127.0.0.1 $MASTER_IP >/dev/null 2>&1; then

    echo "Master IP address already configured on this machine. Doing nothing."

    exit 0

  fi

  # Check if the master IP address is already configured on another machine

  if fping -c $FPING_PACKET_COUNT -p $FPING_PACKET_INTERVAL_MS \

      $MASTER_IP >/dev/null 2>&1; then

    echo "Error: master IP address configured on another machine." >&2

    exit 1

  fi

  if ! ip addr add $MASTER_IP/$MASTER_NETMASK \

     dev $MASTER_NETDEV label $MASTER_NETDEV:0; then

    echo "Error during the activation of the master IP address" >&2

    exit 1

  fi

  # Send gratuituous ARP to update neighbours' ARP cache

  $ARP_COMMAND || :

}

# Stop the master IP

stop() {

  # Check if the master IP address is still configured on this machine

  if ! ip addr show dev $MASTER_NETDEV | \

     grep -F " $MASTER_IP/$MASTER_NETMASK" >/dev/null 2>&1; then

    # Check if the master IP address is configured on a wrong device

    if fping -c $FPING_PACKET_COUNT -p $FPING_PACKET_INTERVAL_MS \

        -S 127.0.0.1 $MASTER_IP >/dev/null 2>&1; then

      echo "Error: master IP address configured on wrong device," \

           "can't shut it down." >&2

      exit 1

    else

      echo "Master IP address not configured on this machine. Doing nothing."

      exit 0

    fi

  fi

  if ! ip addr del $MASTER_IP/$MASTER_NETMASK dev $MASTER_NETDEV; then

    echo "Error during the deactivation of the master IP address" >&2

    exit 1

  fi

}

if (( $# < 1 )); then

  echo $USAGE_MSG >&2

  exit 1

fi

case "$1" in

  start)

    start

    ;;

  stop)

    stop

    ;;

  *)

    echo $USAGE_MSG >&2

    exit 1

    ;;

esac

exit 0