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May I suggest a little patch to support PNP4Nagios? I am quite new at this an I do not know how to do in a different way, so as the patch is very small, I am pasting it here. Hope it can help.

roberto

=====
--- old/check_mysql_connections 2011-06-13 09:41:19.000000000 +0200
+++ new/check_mysql_connections 2011-06-13 09:46:49.000000000 +0200
@@ -14,6 +14,7 @@
# V1.1.0 gs 20060818 user mysqladmin options
# V1.1.1 gs 20070405 fix result calculation
# fix by and thanks to Stephan Helas
+# 20110613 added PNP4nagios support - Roberto Resecco

source /usr/lib/nagios/plugins/utils.sh

@@ -84,15 +85,15 @@
CONNS=$((`mysqladmin $MYSQLOPTS processlist 2>/dev/null|wc -l`-4))

if [ $CONNS -ge $CRIT ]; then
- echo "CRITICAL: $CONNS/$MAXCONNS mysql connections"
+ echo "CRITICAL: $CONNS/$MAXCONNS mysql connections|mysqlConnections=$CONNS"
exit $STATE_CRITICAL
elif [ $CONNS -ge $WARN ]; then
- echo "WARNING: $CONNS/$MAXCONNS mysql connections"
+ echo "WARNING: $CONNS/$MAXCONNS mysql connections|mysqlConnections=$CONNS"
exit $STATE_WARNING
elif [ $CONNS -ge 0 ]; then
- echo "OK: $CONNS/$MAXCONNS mysql connections"
+ echo "OK: $CONNS/$MAXCONNS mysql connections|mysqlConnections=$CONNS"
exit $STATE_OK
else
- echo "UNKNOWN: Cannot determine number of connections"
+ echo "UNKNOWN: Cannot determine number of connections|mysqlConnections=$CONNS"
exit $STATE_UNKNOWN
fi
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