config/events.d/20.multipathd

   1 #!/bin/sh
   2 # ctdb event script for monitoring the multipath daemon
   3 #
   4 # Configure monitporing of multipath devices by listing the device serials
   5 # in /etc/ctdb/multipathd :
   6 #   CTDB_MONITOR_MPDEVICES="device1 device2 ..."
   7 #
   8
   9 . $CTDB_BASE/functions
  10
  11 service_name="multipathd"
  12
  13 loadconfig
  14
  15 [ -z "$CTDB_MONITOR_MPDEVICES" ] && {
  16         exit 0
  17 }
  18
  19 MPFAILURE=$CTDB_BASE/state/multipathd/failure
  20
  21 multipathd_check_background()
  22 {
  23         for DEVICE in $CTDB_MONITOR_MPDEVICES; do
  24                 # check that we can see all devices
  25                 if [ -z "`multipath -ll $DEVICE`" ]; then
  26                         echo Device $DEVICE not known to multipathd
  27                         exit 1
  28                 fi
  29
  30                 # check that all devices are active
  31                 if [ -z "`multipath -ll $DEVICE|grep prio|grep active`" ]; then
  32                         echo Device $DEVICE has no active paths
  33                         exit 1
  34                 fi
  35         done
  36         exit 0
  37 }
  38
  39 multipathd_check()
  40 {
  41         # run the actual check in the background since the call to
  42         # multipath may block.
  43         (
  44         multipathd_check_background &
  45         pid="$!"
  46         timeleft=10
  47
  48         while [ $timeleft -gt 0 ]; do
  49                 timeleft=$(($timeleft - 1))
  50
  51                 # see if the process still exists
  52                 /bin/kill -0 $pid > /dev/null 2>&1 || {
  53                         # it doesn't exist, grab its exit status
  54                         wait $pid
  55                         [ $? = 0 ] || {
  56                                 echo "20.multipathd: multipath background update exited with status $?"
  57                                 touch $MPFAILURE
  58                                 exit 1
  59                         }
  60                         rm $MPFAILURE 2>/dev/null
  61                         exit 0
  62                 }
  63                 sleep 1
  64         done
  65         echo "20.multipathd: Callout to multipath checks hung."
  66         touch $MPFAILURE
  67         exit 1
  68         ) &
  69
  70         if [ -f $MPFAILURE ]; then
  71                 return 1
  72         else
  73                 return 0
  74         fi
  75 }
  76
  77 case $cmd in
  78      startup)
  79         # create a state directory to keep/track the multipath device
  80         # state
  81         /bin/mkdir -p $CTDB_BASE/state/multipathd
  82         exit 0
  83         ;;
  84
  85      monitor)
  86         multipathd_check
  87         [ "$?" = "0" ] || {
  88                 echo 20.multipathd: monitoring of multipathing failed
  89                 exit 1
  90         }
  91         exit 0
  92         ;;
  93 esac
  94
  95 # ignore unknown commands
  96 exit 0