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#!/bin/sh
# ctdb event script for monitoring the multipath daemon
#
# Configure monitporing of multipath devices by listing the device serials
# in /etc/ctdb/multipathd :
# CTDB_MONITOR_MPDEVICES="device1 device2 ..."
#
[ -n "$CTDB_BASE" ] || \
CTDB_BASE=$(d=$(dirname "$0") && cd -P "$d" && dirname "$PWD")
. "${CTDB_BASE}/functions"
service_name="multipathd"
load_script_options
[ -n "$CTDB_MONITOR_MPDEVICES" ] || exit 0
ctdb_setup_state_dir "service" "$service_name"
# script_state_dir set by ctdb_setup_state_dir()
# shellcheck disable=SC2154
multipath_fail="${script_state_dir}/fail"
multipathd_check_background()
{
for _device in $CTDB_MONITOR_MPDEVICES; do
# Check multipath knows about the device
_out=$(multipath -ll "$_device")
if [ -z "$_out" ] ; then
echo "ERROR: device \"${_device}\" not known to multipathd" \
>"$multipath_fail"
exit 1
fi
# Check for at least 1 active path
if ! echo "$_out" | grep 'prio=.* status=active' >/dev/null 2>&1 ; then
echo "ERROR: multipath device \"${_device}\" has no active paths" \
>"$multipath_fail"
exit 1
fi
done
exit 0
}
multipathd_check()
{
# Run the actual check in the background since the call to
# multipath may block
multipathd_check_background </dev/null >/dev/null 2>&1 &
_pid="$!"
_timeleft=10
while [ $_timeleft -gt 0 ]; do
_timeleft=$((_timeleft - 1))
# see if the process still exists
kill -0 $_pid >/dev/null 2>&1 || {
if wait $_pid ; then
return 0
else
cat "$multipath_fail"
rm -f "$multipath_fail"
return 1
fi
}
sleep 1
done
echo "ERROR: callout to multipath checks hung"
# If hung then this probably won't work, but worth trying...
kill -9 $_pid >/dev/null 2>&1
return 1
}
case "$1" in
monitor)
multipathd_check || die "multipath monitoring failed"
;;
esac
exit 0
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