Zabbix 4 Network Monitoring - Third Edition

Flexible user parameters

We're now gathering data on all open connections. But looking at the netstat output, we can see connections in different states, such as TIME_WAIT and ESTABLISHED:

tcp   0   0   127.0.0.1:10050   127.0.0.1:60774         TIME_WAIT
tcp   0   0   192.168.56.10:22  192.168.56.1:51187      ESTABLISHED  

If we want to monitor connections in different states, would we have to create a new user parameter for each? Fortunately, no. Zabbix supports so-called flexible user parameters, which allow us to pass parameters to the command executed.

Again, edit zabbix_agentd.conf and modify the user parameter line we added before to read as follows:

UserParameter=net.tcp.conn[*],netstat -nt | grep ^tcp | grep -c "$1" 

The ss utility again might be better in modern ...