Here's what I use:
Running in cron every 5 minutes. Works like a charm.
#!/bin/sh
HOST=`hostname`
NAGIOS_HOST=nagios1.mysite.com
NRPE=/usr/local/nagios/libexec/check_nrpe
CMD_FILE=/usr/local/nagios/var/rw/nagios.cmd
CHECK_STATUS=/usr/local/nagios/var/master.status
LOG_FILE=/usr/local/nagios/var/master.status.log
echocmd="/bin/echo -e"
mailcmd="/bin/mail"
mailto="[EMAIL PROTECTED]"
datetime=$(date +%s)
datelog=$(date +%F\ %T)
## functions
function down_mail()
{
$echocmd "Slave Nagios server $HOST has entered ACTIVE mode and taken over
network monitoring responsibilities!\nSomeone needs to check out
$NAGIOS_HOST" | $mailcmd -s "ALERT: $HOST Has Entered ACTIVE Mode" $mailto
}
function up_mail()
{
$echocmd "Slave Nagios server $HOST has returned to STANDBY mode because
master server $NAGIOS_HOST is now running." | $mailcmd -s "RECOVERY: $HOST
Has Entered STANDBY Mode" $mailto
}
function warn_mail()
{
$echocmd "Warning: status of master Nagios server $NAGIOS_HOST is
unknown.\nStandby server was NOT activated.\nSomeone needs to check the
script $0\nHere is a tail of the logfile:\n `tail -n 5 $LOG_FILE`" |
$mailcmd -s "WARNING: master nagios server status UNKNOWN" $mailto
}
## end functions
if ! test -d $(dirname $CHECK_STATUS); then
mkdir -p $(dirname $CHECK_STATUS)
fi
if ! test -p $CMD_FILE; then
echo "[$datelog] error writing to command file" | tee -a $LOG_FILE;
exit 1;
fi
## Run the check
$NRPE -H $NAGIOS_HOST $* -c check_nagios > /dev/null 2>&1
n=$?
last=`cat $CHECK_STATUS`
## big ugly if
if ! [ $last = $n ]; then
echo "[$datelog] state change detected: from $last to $n" | tee -a
$LOG_FILE;
if test $n -eq 0; then
echo "[$datelog] master is OK: disabling notifications and svc
checks" | tee -a $LOG_FILE
echo "[$datetime] DISABLE_NOTIFICATIONS;$datetime" >> $CMD_FILE
echo "[$datetime] STOP_EXECUTING_SVC_CHECKS" >> $CMD_FILE
up_mail
elif test $n -eq 2; then
echo "[$datelog] master is NOT OK: enabling notifications and svc
checks" | tee -a $LOG_FILE
echo "[$datetime] ENABLE_NOTIFICATIONS;$datetime" >> $CMD_FILE
echo "[$datetime] START_EXECUTING_SVC_CHECKS" >> $CMD_FILE
down_mail
else
echo "[$datelog] master status warning or unknown" | tee -a
$LOG_FILE
warn_mail
fi
else
if [ `date +%M` -eq 0 ]; then
echo "[$datelog] no change detected: current status is $n" | tee -a
$LOG_FILE
fi
fi
## end big ugly if
## write current state to status file
echo "$n" >$CHECK_STATUS
________________________________
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Lehman,
John
Sent: Wednesday, October 25, 2006 1:39 PM
To: Nagios Users mailinglist
Subject: [Nagios-users] failover
Question for everyone.
I have 2 nagios servers and one is active all the time and the other is
standby.
I have read the documentation on implementing failover but I am finding it
difficult implementing.
Is there anyone that could give me sample scripts which "on the standby
host" would "check the nagios master" and if the nagios master were down
then the standby would become the active host?
I am losing my mind trying to implement from the documentation and I would
appreciate any advice on this one.
John
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