If you run bitcoind as a systemd service, it should log to journalctl by default. I don't recall doing anything beyond that for sys logging on my node.
I figured it out: I needed to remove `-daemon` from the `ExecStart` in the systemd unit file and change the unit `Type` to `exec` or `simple` instead of `forking`. Otherwise bitcoind does not print to stdout
I just got home and was about to send you my service file for reference. Glad you got it figured out!
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