https://www.linode.com/docs/troubleshooting/troubleshooting-common-apache-issues/
https://www.linode.com/docs/troubleshooting/troubleshooting/#is-the-web-server-running
https://www.virtualmin.com/node/40604 - vypise pripojene IP adresy:
netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | head # connections by IP
tail -f /home/$USER/log/access_log # realtime acceslog
ps auxwf # prosesy, zdroje, users, commands
netstat -t -n | grep -c ESTABLISHED
netstat -t | grep ESTABLISHED | wc -l
netstat -t # ukaze vsetky aktivne pripojenia
https://superuser.com/questions/604998/monitor-tcp-traffic-on-specific-port
a
https://www.zabbix.com/forum/zabbix-help/12376-monitoring-total-number-of-connections
https://share.zabbix.com/template-tct-udp-windows-connections
tail, watch: https://serverfault.com/questions/1669/shell-command-to-monitor-changes-in-a-file-whats-it-called-again/1670