ctdb/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 [ -n "$CTDB_BASE" ] || \
  10     export CTDB_BASE=$(cd -P $(dirname "$0") ; dirname "$PWD")
  11
  12 . $CTDB_BASE/functions
  13
  14 service_name="multipathd"
  15
  16 loadconfig
  17
  18 [ -n "$CTDB_MONITOR_MPDEVICES" ] || exit 0
  19
  20 ctdb_setup_service_state_dir
  21
  22 multipath_fail="${service_state_dir}/fail"
  23
  24 multipathd_check_background()
  25 {
  26     for _device in $CTDB_MONITOR_MPDEVICES; do
  27         # Check multipath knows about the device
  28         _out=$(multipath -ll "$_device")
  29         if [ -z "$_out" ] ; then
  30             echo "device \"${_device}\" not known to multipathd" >"$multipath_fail"
  31             exit 1
  32         fi
  33
  34         # Check for at least 1 active path
  35         if ! echo "$_out" | grep 'prio=.* status=active' >/dev/null 2>&1 ; then
  36             echo "multipath device \"${_device}\" has no active paths" >"$multipath_fail"
  37             exit 1
  38         fi
  39     done
  40     exit 0
  41 }
  42
  43 multipathd_check()
  44 {
  45     # Run the actual check in the background since the call to
  46     # multipath may block
  47     multipathd_check_background </dev/null >/dev/null 2>&1 &
  48     _pid="$!"
  49     _timeleft=10
  50
  51     while [ $_timeleft -gt 0 ]; do
  52         _timeleft=$(($_timeleft - 1))
  53
  54         # see if the process still exists
  55         kill -0 $_pid >/dev/null 2>&1 || {
  56             if wait $_pid ; then
  57                 return 0
  58             else
  59                 echo -n "ERROR: "
  60                 cat "$multipath_fail"
  61                 rm -f "$multipath_fail"
  62                 return 1
  63             fi
  64         }
  65         sleep 1
  66     done
  67
  68     echo "ERROR: callout to multipath checks hung"
  69     # If hung then this probably won't work, but worth trying...
  70     kill -9 $_pid >/dev/null 2>&1
  71     return 1
  72 }
  73
  74 case "$1" in
  75     monitor)
  76         multipathd_check || die "multipath monitoring failed"
  77         ;;
  78
  79     *)
  80         ctdb_standard_event_handler "$@"
  81         ;;
  82 esac
  83
  84 exit 0