Improved MySQL server down detection

mysqlchk

@@ -18,6 +18,7 @@ CHECK_QUERY="select 1"
 CHECK_QUERY1="show global status where variable_name='wsrep_local_state'"
 CHECK_QUERY2="show global variables where variable_name='read_only'"
 CHECK_QUERY3="show global variables where variable_name='wsrep_sst_method'"
+CHECK_QUERY4="show global status where variable_name='wsrep_cluster_status'"
 GALERA=`/sbin/uci get mariadb.galera.cluster_address`
 
 return_ok()
@@ -80,6 +81,18 @@ else
 	    fi
 	fi
 
+	status=$($MYSQL_BIN $MYSQL_OPTS --host=$MYSQL_HOST --port=$MYSQL_PORT --user=$MYSQL_USERNAME -e "$CHECK_QUERY4;" 2>/dev/null)
+	if [ $? -ne 0 ]; then
+	    return_fail;
+	fi
+	status=$(echo $status | awk '{print $2;}')
+
+	if [ ! "$status" = "Primary" ]; then
+	    return_fail;
+	fi
+
 	return_ok;
+    else
+	return_fail;
     fi
 fi