Contents of /trunk/nl.nikhef.ndpf.tools/nagios-ndpf-sensors/eventhandlers/restart-service

#!/bin/bash

# Nagios event handler to restart a service
# To be used when check_service detects that a daemon is not running
# with either a remaining PID file or a lock file
# This handler should not be used when the init script does not
# properly distinguish "stopped" daemons from crashed daemons (i.e.,
# the init script does not clean up when the service is stopped).

if [ $# -lt 4 ]; then
    echo "Missing required arguments (4 required in total)" >&2
    exit 1
fi

MAX_RESTARTS=4
verb=1

# verify the file system state
function try_restart() {
    if [ ! -f $1 ]; then
        [ $verb -gt 0 ] && echo "Cannot execute $1"
        return 1
    fi

    # first try a restart
    $1 restart > /dev/null 2> /dev/null
    sleep 1
    $1 status  > /dev/null 2> /dev/null
    if [ $? -ne 0 ]; then
        # try a stop and start
        ( $1 stop ; sleep 2 ; $1 start ) > /dev/null 2> /dev/null    
    fi
    
    # log restart to syslog
    logger -p syslog.warning "Tried to restart $1"
}


case "$1" in
    OK)         # service is fine, nothing to do
        ;;
    WARNING)    # service was stopped, nothing to do
        ;;
    UNKNOWN)    # not sure how to proceed here, so do nothing
        ;;
    CRITICAL)   # ACTION!
        if [ "$2" == "SOFT" ]; then
            try_restart "$4"
        elif [ "$2" == "HARD" ]; then
            if [ $3 -lt $MAX_RESTARTS ]; then
                try_restart "$4"
            fi
        fi
        ;;
esac

exit 0

1	#!/bin/bash
2
3	# Nagios event handler to restart a service
4	# To be used when check_service detects that a daemon is not running
5	# with either a remaining PID file or a lock file
6	# This handler should not be used when the init script does not
7	# properly distinguish "stopped" daemons from crashed daemons (i.e.,
8	# the init script does not clean up when the service is stopped).
9
10	if [ $# -lt 4 ]; then
11	echo "Missing required arguments (4 required in total)" >&2
12	exit 1
13	fi
14
15	MAX_RESTARTS=4
16	verb=1
17
18	# verify the file system state
19	function try_restart() {
20	if [ ! -f $1 ]; then
21	[ $verb -gt 0 ] && echo "Cannot execute $1"
22	return 1
23	fi
24
25	# first try a restart
26	$1 restart > /dev/null 2> /dev/null
27	sleep 1
28	$1 status > /dev/null 2> /dev/null
29	if [ $? -ne 0 ]; then
30	# try a stop and start
31	( $1 stop ; sleep 2 ; $1 start ) > /dev/null 2> /dev/null
32	fi
33
34	# log restart to syslog
35	logger -p syslog.warning "Tried to restart $1"
36	}
37
38
39	case "$1" in
40	OK) # service is fine, nothing to do
41	;;
42	WARNING) # service was stopped, nothing to do
43	;;
44	UNKNOWN) # not sure how to proceed here, so do nothing
45	;;
46	CRITICAL) # ACTION!
47	if [ "$2" == "SOFT" ]; then
48	try_restart "$4"
49	elif [ "$2" == "HARD" ]; then
50	if [ $3 -lt $MAX_RESTARTS ]; then
51	try_restart "$4"
52	fi
53	fi
54	;;
55	esac
56
57	exit 0
58
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