1 files changed, 83 insertions, 0 deletions
diff --git a/ctdb/config/events/legacy/20.multipathd.script b/ctdb/config/events/legacy/20.multipathd.script
new file mode 100755
index 0000000..a420251
--- /dev/null
+++ b/ctdb/config/events/legacy/20.multipathd.script
@@ -0,0 +1,83 @@
+#!/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