Install NRPE on CentOS 7

1) Install required packages yum -y install wget openssl-devel 2)  Download latest NRPE agent   cd /tmp wget http://assets.nagios.com/downloads/nagiosxi/agents/linux-nrpe-agent.tar.gz   3)  Unzip NRPEagent tar xzf linux-nrpe-agent.tar.gz 4)  Install agent   cd linux-nrpe-agent ./fullinstall You will get asked which hosts to add. include your Nagios Server here In this case my Nagios server is 10.0.0.50 6)  Read More…

Nessus Scan Showing SSLv3 on NS Client

Problem During a Nessus scan of a network it was showing lots of insecurities with an NSClient configuarion on a windows machine we were monitoring via Nagios. OS: Windows 2016 NSClient: 0.3.x Nagios: 4.0.7   Looking at one particular issue (SSLv2 and SSLv3) showing on the report: Nessus Output: The remote service accepts connections encrypted Read More…

Add NRPE Exim Mailqueue Check to cPanel Server

This blog assumes that NRPE and nagios plugins are already installed on the remote server. Remote OS: Centos 6.7 Nagios Server OS: Centos 5.7 WHM: 11.50.0 NRPE: 2.14   Remote server Download the check_eximailqueue plugin (version 1.3 as of writing) from Nagios.org . Upload the plugin to the the Nagios plugin directory (/usr/lib64/nagios/plugins/) on the remote server [RemoteServer]# vi /usr/lib64/nagios/plugins/check_eximailqueue Uncomment Read More…

Nagios: DNS CRITICAL – ‘/usr/bin/nslookup -sil’ msg parsing exited with no address

Scenario: We changed from BIND to Unbound on a smarthost email server. As soon as this was changed Nagios started throwing up a "DNS CRITICAL – '/usr/bin/nslookup -sil' msg parsing exited with no address" . In the following example i've substituted myhost.domain.co.uk for the actual host. Troubleshooting steps:  From the Nagios server i checked the config file: Read More…