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Active checks

We do provide some active checks to monitor the functionality of applications like DNS/HTML: https://docs.checkmk.com/latest/en/active_checks.html. For more information, read the Active Checks section of the documentation.

Agent Plugin "Established TCP/UDP connections."

We do provide a netstat plugin collecting the network statistics. To configure the plugin, you have two ways:

Manual Configuration

Copy the corresponding plugin to the monitored host as described here: https://docs.checkmk.com/latest/en/agent_linux.html#manualplugins in the documentation:

./share/check_mk/agents/plugins/netstat.solaris
./share/check_mk/agents/plugins/netstat.aix
./share/check_mk/agents/plugins/netstat.linux
./share/check_mk/agents/windows/plugins/netstat_an.bat

By Using the Agent Bakery

Setup → Agents → Windows, Linux, Solaris, AIX → Agent rules → Established TCP/UDP connections → New rule: Established TCP/UDP connections

Next, bake the new agent and to install it on the monitored host.

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Start monitoring the ports

After the plugin is in place, you now need to  configure the corresponding service rule. In that case, it's an enforced service.

Setup → Services → Enforced services → Monitor → Monitor specific TCP/UDP connections and listeners → New rule: Monitor specific TCP/UDP connections and listeners
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Useful for troubleshooting:

If net-tools is already installed but it still does not work, execute the command manually and check if it generates output or not. The command executed by the plugin:

netstat -ntua | grep -E '^(tcp|udp)' | sed -e 's/LISTEN/LISTENING/g'

If everything works, the below section will be added to the agent output:

<<<netstat>>>

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