How-to monitor tcp/udp ports

Owned by Anastasios Thomaidis
Last updated: Dec 11, 2023 by Matthew Hierholzer
1 min read
This manual will show you some options to monitor tcp/udp ports with Checkmk.

LAST TESTED ON CHECKMK 2.2.0P1

Table of Contents

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

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

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

./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

Bakery

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

Screenshot of new rule for TCP and UDP connections.

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Now you will 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: Monitor specific TCP/UDP connections and listeners

Screenshot of options enabled. Connection name is apache and the protocol set to tcp. Local IP is 127.0.0.1 and the port is 80.