Nagios client/plugins installation

I have installed Nagios on CentOS 6.8, nagios core + plugins. That means centos68 is now my nagios server. Now If I want to monitor another host say ubuntu, I should only install plugins on that server if I am not wrong ?

Kindly advise if I am wrong.

Solution

You should install the Nagios plugins on the Nagios server and install the Nagios NRPE agent on the servers you want to monitor.

cd /tmp
wget https://assets.nagios.com/downloads/nagiosxi/agents/linux-nrpe-agent.tar.gz
tar xzf linux-nrpe-agent.tar.gz
cd linux-nrpe-agent
./fullinstall

The above will

Modifying the distro's package manager repositories
Installing prerequisite packages
Creating required uses and groups
Defining services for xinetd
Compiling and installing the agent and plugins
Configuring the firewall
Configuring the agent

The script will stop to prompt you once, to ask for the IP address of your Nagios server. After installing the NRPE agent you can use check_nrpe on the Nagios server to run the plugins remotely and return the result.

./check_nrpe -H ubuntu-server -c check_uptime