Issue with External monitor returning value
I am attempting to write an external monitor to determine which of our three databases is the "master." We need to first ssh to the server and then run a command. This command should return either a 'true' or 'fals' #!/bin/sh # Name of the pidfile pidfile="/var/run/$MONITOR_NAME.$1..$2.pid" # Send signal to the process group to kill our former self and any children # as external monitors are run with SIGHUP blocked if [ -f $pidfile ] then kill -9 -`cat $pidfile` > /dev/null 2>&1 fi echo "$$" > $pidfile # Remove the IPv6/IPv4 compatibility prefix node_ip=`echo $1 | sed 's/::ffff://'` /bin/expect<<EOF log_file -noappend /var/tmp/mongo_status.log spawn /bin/ssh svc_f5_mongo@10.xx.yy.zz sleep 1; expect "password:" send "***********" expect "svc_f5" send "/bin/mongo -u ******** -p ******** --authenticationDatabase admin --eval 'printjson(db.isMaster())'|grep 'ismaster' | cut -c15-18\r" sleep 4 send "exit\r" EOF status=$? echo "$status" if [ $status -eq 0 ] then # Remove the pidfile before the script echoes anything to stdout and is killed by bigd rm -f $pidfile echo "up" fi # Remove the pidfile before the script ends rm -f $pidfile I have been unable to determine the the value from expect. Any suggestions would be most appreciated. Thank you