[systemd-devel] Systemd service and structured logging

Jérémy ROSEN jeremy.rosen at smile.fr
Fri May 3 11:29:17 UTC 2019

if you want the whole power of structured logs, you need to use the
journald API
I am not sure in what language your program is written, but if you are
using C, it's pretty trivial to do
(and i'm pretty sure most bindings are trivial to use too)

Automated parsing of stdout is limited, you can
* add a (constant) key=value to all messge
* automatically parse a "<x>" prefix and transform that into a message
and that's pabasically it. for anything more complex, you need to go
through the journald API

Le ven. 3 mai 2019 à 11:14, Thomas Güttler <guettliml at thomas-guettler.de> a
écrit :

> 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?
> For example my service writes this to stdout:
> {"key1": "value1", "key2": 1234}
> {"key1": "value2", "key2": 5678}
> ...
> It would be great of systemd could read the string as json.
> Related question at StackO:
> https://stackoverflow.com/questions/55806921/systemd-service-and-structured-logging
> I see two ways:
> V1: my logs get stored in journald as message (as plain string).
> V2: my key-value pairs get stored in the journald key-value dictionary.
> What do you suggest?
> Background: I don't want an ELK stack. I want a simple solution. Since
> journald already has key-value pairs for a log entry, why not use it?
> --
> Thomas Guettler http://www.thomas-guettler.de/
> I am looking for feedback:
> https://github.com/guettli/programming-guidelines
> _______________________________________________
> systemd-devel mailing list
> systemd-devel at lists.freedesktop.org
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