Install Node Exporter on server but can’t make it work. Simply ! Coz Virtualmin have installed & enabled FirewallD. Just disable it or allow port 9100.
sudo systemctl disable firewalld.service
sudo systemctl stop firewalld.serviceTag: Ubuntu
Ubuntu – Sudo without password require
soulevil ALL=(ALL) NOPASSWD:ALLUbuntu – Check running ports
How to check if port is in use in
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo ss -tulpn | grep LISTEN
sudo lsof -i:22 ## see a specific port such as 22 ##
sudo nmap -sTU -O IP-address-Here