Page Comparison

...

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

...

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:

...

Image Modified

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

...

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 specific TCP/UDP connections and listeners → New rule

...

:

Image Added

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>>>

Related articles

...