config/events.d/61.nfstickle

   1 #!/bin/sh
   2 # ctdb event script for NFS tickle acks
   3
   4 PATH=/bin:/usr/bin:$PATH
   5
   6 . $CTDB_BASE/functions
   7 loadconfig ctdb
   8 loadconfig nfs
   9
  10 cmd="$1"
  11 shift
  12
  13 [ "$CTDB_MANAGES_NFS" = "yes" ] || exit 0
  14 [ -z "$NFS_TICKLE_SHARED_DIRECTORY" ] && exit 0
  15
  16 case $cmd in
  17      startup)
  18         mkdir -p $CTDB_BASE/state/nfstickle
  19         mkdir -p $NFS_TICKLE_SHARED_DIRECTORY/`hostname`
  20         # we rely on fast tcp wait1 recycling
  21         echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle
  22         exit 0
  23         ;;
  24
  25      takeip)
  26         iface=$1
  27         ip=$2
  28         # first send a grat arp, to ensure the client knows the updated
  29         # mac address for this IP
  30         ctdb gratiousarp $ip $iface
  31         # send tickle acks for all the connections the old server had
  32         for f in $NFS_TICKLE_SHARED_DIRECTORY/*/$ip; do
  33                 [ -f $f ] && cat $f | while read dest; do
  34                         dip=`echo $dest | cut -d: -f1`
  35                         dport=`echo $dest | cut -d: -f2`
  36                         # send three, in case of lost packets
  37                         echo "Sending NFS tickle ack for $ip to $dip:$dport"
  38                         for i in `seq 1 3`; do
  39                                 ctdb tickle $dip:$dport $ip:2049
  40                         done
  41                 done
  42         done
  43         exit 0
  44         ;;
  45
  46      releaseip)
  47         exit 0
  48         ;;
  49
  50      recovered)
  51         exit 0
  52         ;;
  53
  54      shutdown)
  55         exit 0
  56         ;;
  57
  58      monitor)
  59 # always create these direcotries since NFS might be enabled at runtime
  60         # and we dont want to restart ctdbd
  61         mkdir -p $CTDB_BASE/state/nfstickle
  62         mkdir -p $NFS_TICKLE_SHARED_DIRECTORY/`hostname`
  63
  64         mydir=$NFS_TICKLE_SHARED_DIRECTORY/`hostname`
  65         rm -f $mydir/*
  66         # record our connections to shared storage
  67         netstat -tn |egrep '^tcp[[:space:]]+[0-9]+[[:space:]]+[0-9]+[[:space:]]+[0-9\.]+:2049.*ESTABLISHED' |
  68                 awk '{print $4" "$5}' |
  69                 while read dest src; do
  70                         ip=`echo $dest | cut -d: -f1`
  71                         echo $src >> $mydir/$ip
  72                 done
  73         exit 0
  74         ;;
  75
  76 esac
  77
  78 # ignore unknown commands
  79 exit 0