[systemd-devel] Systemd service and structured logging
Lennart Poettering
lennart at poettering.net
Mon May 6 14:09:10 UTC 2019
On Fr, 03.05.19 11:09, Thomas Güttler (guettliml at thomas-guettler.de) wrote:
> I have a systemd service which is of type "simple".
>
> I want my service to log key-value pairs.
>
> Is there a way to use structured logs with systemd?
Depend on your programming language.
In C, sd_journal_send()/sd_journal_sendv() is the API of choice.
https://www.freedesktop.org/software/systemd/man/sd_journal_print.html
That said, there are other C APIs that speak the same protocol. For
example, glib's logging logic will magically use systemd's native
logging protocol if it is available.
If you use a different programming language, there are bindings for
the same protocol for various languages around (including python).
> It would be great of systemd could read the string as json.
JSON is complex to index properly. systemd supports a simpler
"environment-variable-like" format instead. For details see link
above.
Lennart
--
Lennart Poettering, Berlin
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