Configuring SSL/TLS on Nagios

This post describes how to configure SSL/TLS on your Nagios server. During the initial setup, I’m using CentOS 7.x. yum install -y mod_ssl openssl Next, go to root’s home directory. If you are not logged in as root, go ahead and do so. cd ~ Next will need to generate a Private Key File. This […]

Nagios Notifications Not Working

If for some reason, your Nagios server stops sending out host alerts it’s more than likely that recent update broke it. If that is the case, you will need to re-run the update, which should fix the issue. In the event that this does not fix the problem, check your email settings in nagios. This […]

XINETD/NRPE | Cannot Write to Pidfile

Cannot write to pidfile ‘/var/run/nagios/nrpe.pid’ – check your privileges. This error occurs when the “pidfile” cannot be rewritten. In most cases, this happens after a reboot and the file itself is read-only instead of read/write. If that is the case, go ahead and restart the xinetd and nrpe services. service xinetd restart service nrpe restart Next, check the status […]

Configure NRPE/XINETD

Enter the following commands into your terminal session: cd /tmp wget https://assets.nagios.com/downloads/nagiosxi/agents/linux-nrpe-agent.tar.gz After the file has downloaded, you will need to unzip the file tar -xzf linux-nrpe-agent.tar.gz Then enter the new directory. cd linux-nrpe-agent Inside the new directory, there will be a number of scripts and config files. You will need to run “fullinstall” ./fullinstall […]