Add wsrep_flow_control_paused check

If this value is > 0.1 usually there is a problem.
  Also add default exit value to UNKNOWN.

README.md

@@ -6,7 +6,7 @@ Version 1.0, Guillaume Coré <g@fridim.org>
 
     check_galera_cluster is a Nagios plugin to monitor Galera cluster status.
     
-    check_galera_cluster -u USER -p PASSWORD [-H HOST] [-P PORT] [-w SIZE] [-c SIZE] [-0]
+    check_galera_cluster -u USER -p PASSWORD [-H HOST] [-P PORT] [-w SIZE] [-c SIZE] [-f FLOAT] [-0]
     
     Options:
       u)
@@ -21,5 +21,7 @@ Version 1.0, Guillaume Coré <g@fridim.org>
         Sets minimum number of nodes in the cluster when WARNING is raised. (default is same as critical).
       c)
         Sets minimum number of nodes in the cluster when CRITICAL is raised. (default is 2).
+      f)
+        Sets critical value of wsrep_flow_control_paused (default is 0.1).
       0)
         Rise CRITICAL if the node is not primary

check_galera_cluster

@@ -7,6 +7,7 @@ ST_OK=0
 ST_WR=1
 ST_CR=2
 ST_UK=3
+ST_FINAL=$ST_UK
 
 print_version() {
     echo "$VERSION $AUTHOR"
@@ -17,7 +18,7 @@ print_help() {
     echo ""
     echo "$PROGNAME is a Nagios plugin to monitor Galera cluster status."
     echo ""
-    echo "$PROGNAME -u USER -p PASSWORD [-H HOST] [-P PORT] [-w SIZE] [-c SIZE] [-0]"
+    echo "$PROGNAME -u USER -p PASSWORD [-H HOST] [-P PORT] [-w SIZE] [-c SIZE] [-f FLOAT] [-0]"
     echo ""
     echo "Options:"
     echo "  u)"
@@ -32,6 +33,8 @@ print_help() {
     echo "    Sets minimum number of nodes in the cluster when WARNING is raised. (default is same as critical)."
     echo "  c)"
     echo "    Sets minimum number of nodes in the cluster when CRITICAL is raised. (default is 2)."
+    echo "  f)"
+    echo "    Sets critical value of wsrep_flow_control_paused (default is 0.1)."
     echo "  0)"
     echo "    Rise CRITICAL if the node is not primary"
     exit $ST_UK
@@ -41,8 +44,9 @@ print_help() {
 crit=2
 port='3306'
 mysqlhost='localhost'
+fcp=0.1
 
-while getopts “hvu:p:H:P:w:c:0” OPTION; do
+while getopts “hvu:p:H:P:w:c:f:0” OPTION; do
     case $OPTION in
         h)
             print_help
@@ -70,6 +74,9 @@ while getopts “hvu:p:H:P:w:c:0” OPTION; do
         c)
             crit=$OPTARG
             ;;
+        f)
+            fcp=$OPTARG
+            ;;
         0)
             primary='TRUE'
             ;;
@@ -100,6 +107,17 @@ fi
 
 r1=$(mysql -h$mysqlhost -P$port -u$mysqluser -p$password -e "show status like 'wsrep_cluster_size'"|grep wsrep_cluster_size|cut -f 2)
 r2=$(mysql -h$mysqlhost -P$port -u$mysqluser -p$password -e "show status like 'wsrep_cluster_status'"|grep wsrep_cluster_status|cut -f 2)
+r3=$(mysql -h$mysqlhost -P$port -u$mysqluser -p$password -e "show status like 'wsrep_flow_control_paused'"|grep wsrep_flow_control_paused|cut -f 2)
+
+if [ -z "$r3" ]; then
+  echo "UNKNOWN: wsrep_flow_control_paused is empty"
+  ST_FINAL=$ST_UK
+fi
+
+if [ $(echo "$r3 > $fcp" | bc) = 1 ]; then
+  echo "CRITICAL: wsrep_flow_control_paused is > $fcp"
+  ST_FINAL=$ST_CR
+fi
 
 if [ "$primary" = 'TRUE' ]; then
   if [ "$r2" != 'Primary' ]; then