----------------------------------------------client-side-------------------
1.Client)
`vi /usr/local/nagios/libexec/check_login`
-----------check_login-------------
LAST=`last -n1|head -n1`
echo "$LAST"|grep still &&exit 1
echo "NOBODY LOGON"
exit 0
--------------end------------------
2.Client)
`chmod 755 /usr/local/nagios/libexec/check_login`
3.Client)
`vi /etc/nagios/nrpe.cfg`
------------nrpe.cfg----------------
#add Line
command[check_login]=/usr/local/nagios/libexec/check_login
--------------end-------------------
4.Client)
`systemctl restart nagios-nrpe-server`
-----------------------------------------------server-side--------------------
1.Server)
`vi /usr/local/nagios/etc/objects/commands.cfg`
---------------commands.cfg----------
#add Lines
define command{
        command_name check_nrpe
        command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
        }
-------------------end---------------
2.Server)
`vi /usr/local/nagios/etc/services.cfg`
----------------services.cfg---------
define service{
        use                     generic-service
        host_name               ubuntu-test
        service_description     LOGIN
        check_command           check_nrpe!check_login
        }
-----------------end-----------------
3.Server)
`systemctl restart nagios`