How to change default port for checkmk linux agent 2.1 version

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7

You are welcome. Maybe this picture helps a bit understanding the data flow. It’s from the checkmk conference 2022 and shows the “new” communication.

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To change the listening port we have to change the configuration of the “transport channel” on the left hand side of the slide, i.e. the configuration of the cmk-agent-ctl daemon. By default it listens on port 6556 and allows access from every IP address.

This can be changed with the file /var/lib/cmk-agent/cmk-agent-ctl.toml (in Python syntax):

pull_port = 16556
allowed_ip = [
    "127.0.0.1", 
    "127.0.0.2",
]

(The file doesn’t exist by default.)

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