Monitoring related tutorial/FAQ

Fedora Linux install vnstat network traffic monitor

last updated July 11, 2019 in Fedora Linux, Linux, Monitoring

How do I install vnstat network traffic monitor on Fedora Linux system to monitor my hourly, daily, weekly, and monthly bandwidth usage?

How to check CPU temperature in OpenSUSE Linux

last updated July 5, 2019 in Hardware, Monitoring, Suse

How do I check CPU temperature in OpenSUSE Linux using a command line and GUI tools on my Thinkpad laptop?

pfSense email notification when fallback WAN connection goes down

last updated December 23, 2018 in FreeBSD, Monitoring, Troubleshooting, UNIX

I have two WAN connection. The first WAN connection connects via FTTH modem. The second connection connects via 4G LTE CPE modem. I have configured fallback and load balanced dual WAN connection on my pfSense box. However, once in while the Internet connection either one of the WAN goes down. How can I tell pfSense to send an email notification when fallback (or any) WAN connection goes down? How to configure pfSense email notification when an alert happens?

How to install and use Monit on Ubuntu/Debian Linux server as process supervision tool

last updated June 25, 2017 in Debian / Ubuntu, Linux, Monitoring, Networking

How do I install and configure monit to restart services such as Nginx/Apache/OpenVPN server when failed on Debian or Ubuntu Linux?

FreeBSD Unix Find Out Which Programs Are Listening On a Given Port Number

last updated November 24, 2016 in FreeBSD, FreeBSD Jails (VPS), Monitoring, Networking, Security, Troubleshooting, UNIX

I‘m a new FreeBSD Unix system user. How can I find out the process/programs names listing on a certain port on a FreeBSD Unix systems using command line? How do I lookup the process which is currently bound to the given network port on a FreeBSD server?

Linux / Unix logtop: Realtime Log Line Rate Analyser

last updated July 23, 2014 in Debian / Ubuntu, Linux, Monitoring, Ubuntu Linux, UNIX

How can I analyze line rate taking log file as input on a Linux system? How do I find the IP flooding my Apache/Nginx/Lighttpd web-server on a Debian or Ubuntu Linux?

Linux: Keep An Eye On Your System With Glances Monitor

last updated April 1, 2017 in CentOS, Debian / Ubuntu, Linux, Monitoring, RedHat and Friends

Is there is a tool that can provide me a maximum of information (such as cpu, disk I/O, network, nfsd, memory and more) about my Linux/Unix server in a minimum of space in a terminal?

nixCraft