Setup Remote Access

myLVS is using the NSClient solution to communicate from the myLVS server to the nsclient service
running on the RealServer. myLVS supports both, the NSClient version which comes with Debian Linux
and the Windows version which comes with http://nsclient.org

Setup myLVS with the NSClient (the client part)

Remember: myLVS acts as client in the view of nrpe

• On Debian run the installation command if not already done

root@mylvs01:/# apt-get install nagios-nrpe-plugin -s

• Check to see if the plugin runs without any error, run:

root@mylvs01:/# /usr/lib/nagios/plugins/check_nrpe

Setup the Linux Realserver with the NSClient (the server part)

Remember: The Realserver on Linux acts as server in the view of nrpe

• Install NSClient Server part to the myLVS client

root@myLVS-LinuxClient:~# apt-get install nagios-nrpe-server

• Run sudo

root@mylvs01:/#  visudo -f /etc/sudoers

• Add to sudo

nagios ALL=NOPASSWD: /sbin/ipvsadm
nagios ALL=NOPASSWD: /sbin/init

Edit /etc/nagios/nrpe.cfg

• Set Allowed hosts

allowed_hosts=127.0.0.1 192.168.2.100

• Set dont blame

dont_blame_nrpe=1

• Set two new commands, restart web and reboot

command[reset_apache]=/etc/init.d/apache2 restart
command[reboot]=init 6

• Restart the nrpe server

root@myLVS-LinuxClient:~# /etc/init.d/nagios-nrpe-server restart

Setup the Windows server with the NSClient (the server part)

Remember: Windows acts as server in the view of nrpe

• Get the Windows client here: http://www.nsclient.org/download
  
• Install the client, the settings are not that important, just remove the password.

Edit C:\Program Files\NSClient++\nsclient++.ini

• Add to allowed hosts

allowed hosts = 127.0.0.1,::1,192.168.2.100

• SSL options needed for the classic npe client, worst case is to allow only:

ssl options = sslv2,sslv3

• Verify off

verify mode = none

• Insecure true

insecure = true

• Add commands:

[/settings/external scripts/scripts]
reset_iis="C:\Program Files\NSClient++\scripts\resetiis.bat"
reboot="C:\Program Files\NSClient++\scripts\reboot.bat"

Add two new batch files

• C:\Program Files\NSClient++\scripts\reset_iis.bat

iisreset

• C:\Program Files\NSClient++\scripts\reboot.bat

shutdown /r /f

Don't forget to restart the nrpe++ services when changes are made

Testing the myLVS access

• Reset the IIS service on Windows

root@mylvs01:/home/demo# /usr/lib/nagios/plugins/check_nrpe -H 192.168.2.221 -p 5666  -c reset_iis

• Reset the Apache on Linux

root@mylvs01:/home/demo# /usr/lib/nagios/plugins/check_nrpe -H 192.168.2.222 -p 5666  -c reset_apache

• Reboot Windows

root@mylvs01:/home/demo# /usr/lib/nagios/plugins/check_nrpe -H 192.168.2.221 -p 5666  -c reboot

• Reboot Linux

root@mylvs01:/home/demo# /usr/lib/nagios/plugins/check_nrpe -H 192.168.2.222 -p 5666  -c reboot