ctdb/config/events.d/61.nfstickle

   1 #!/bin/sh
   2 # ctdb event script for NFS tickle acks
   3
   4 . $CTDB_BASE/functions
   5
   6 service_name="nfs"
   7
   8 loadconfig
   9
  10 service_start="mkdir -p $CTDB_BASE/state/nfstickle;mkdir -p $NFS_TICKLE_SHARED_DIRECTORY/`hostname`;echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle"
  11 service_reconfigure=$service_start
  12
  13 ctdb_start_stop_service
  14
  15 [ -z "$NFS_TICKLE_SHARED_DIRECTORY" ] && exit 0
  16
  17 case "$1" in
  18      startup)
  19         ctdb_service_start
  20         ;;
  21
  22      takeip)
  23         iface=$2
  24         ip=$3
  25         # first send a grat arp, to ensure the client knows the updated
  26         # mac address for this IP
  27         ctdb gratiousarp $ip $iface
  28         # send tickle acks for all the connections the old server had
  29         for f in $NFS_TICKLE_SHARED_DIRECTORY/*/$ip; do
  30                 [ -f $f ] && cat $f | while read dest; do
  31                         # send three, in case of lost packets
  32                         echo "Sending NFS tickle ack for $ip to $dest"
  33                         for i in `seq 1 3`; do
  34                                 ctdb tickle $dest $ip:2049
  35                         done
  36                 done
  37         done
  38         ;;
  39
  40      monitor)
  41         mydir=$NFS_TICKLE_SHARED_DIRECTORY/`hostname`
  42         rm -f $mydir/*
  43         # record our connections to shared storage
  44         netstat -tn |egrep '^tcp[[:space:]]+[0-9]+[[:space:]]+[0-9]+[[:space:]]+[0-9\.]+:2049.*ESTABLISHED' |
  45                 awk '{print $4" "$5}' |
  46                 while read dest src; do
  47                         ip=${dest%:*}
  48                         echo $src >> $mydir/$ip
  49                 done
  50         ;;
  51
  52     *)
  53         ctdb_standard_event_handler "$@"
  54         ;;
  55 esac
  56
  57 exit 0