ctdb/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 . /etc/ctdb/functions
   7 loadconfig nfs
   8
   9 cmd="$1"
  10 shift
  11
  12 [ "$CTDB_MANAGES_NFS" = "yes" ] || exit 0
  13 [ -z "$NFS_TICKLE_SHARED_DIRECTORY" ] && exit 0
  14
  15 case $cmd in
  16      startup)
  17         mkdir -p /etc/ctdb/state/nfstickle
  18         mkdir -p $NFS_TICKLE_SHARED_DIRECTORY/`hostname`
  19         # we rely on fast tcp wait1 recycling
  20         echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle
  21         exit 0
  22         ;;
  23
  24      takeip)
  25         iface=$1
  26         ip=$2
  27         shopt -s nullglob
  28         # send tickle acks for all the connections the old server had
  29         for f in $NFS_TICKLE_SHARED_DIRECTORY/*/$ip; do
  30                 cat $f | while read dest; do
  31                         dip=`echo $dest | cut -d: -f1`
  32                         dport=`echo $dest | cut -d: -f2`
  33                         # send three, in case of lost packets
  34                         echo "`date` Sending NFS tickle ack for $ip to $dip:$dport"
  35                         for i in `seq 1 3`; do
  36                                 ctdb tickle $dip:$dport $ip:2049
  37                         done
  38                 done
  39         done
  40         exit 0
  41         ;;
  42
  43      releaseip)
  44         exit 0
  45         ;;
  46
  47      recovered)
  48         exit 0
  49         ;;
  50
  51      shutdown)
  52         exit 0
  53         ;;
  54
  55      monitor)
  56         mydir=$NFS_TICKLE_SHARED_DIRECTORY/`hostname`
  57         rm -f $mydir/*
  58         # record our connections to shared storage
  59         netstat -tn |egrep '^tcp\s+[0-9]+\s+[0-9]+\s+[0-9\.]+:2049.*ESTABLISHED' |
  60                 awk '{print $4" "$5}' |
  61                 while read dest src; do
  62                         ip=`echo $dest | cut -d: -f1`
  63                         echo $src >> $mydir/$ip
  64                 done
  65         exit 0
  66         ;;
  67
  68 esac
  69
  70 # ignore unknown commands
  71 exit 0