Monitoring

Tools

Network

• nload - interface traffic graphs
• bwm-ng - interface traffic stats (no graph)
• jnettop - IP flows, TCP and UDP
• tcptrack  - TCP only
• btop - also shows network stats
  
• conntrack - tracked connection by kernel
  
• netstat or ss - show established local connections and listening ports
  

Zabbix

Custom parameters

Reload configuration:

zabbix_agentd -R userparameter_reload

Put config files in /etc/zabbix/zabbix_agentd.d.

Example configuration to add additional keys to agent to respond to:

UserParameter=ping.rtt.avg[*],ping -c 10 -A -n -q -w 10 "$1" | awk -F/ '/rtt/ { print $$5 }'

Testing:

zabbix_get -s 127.0.0.1 -k 'ping.rtt.avg[127.0.0.1]'