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syslog and journalctl

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My typical approach to logging is as follows:

syslog(LOG_INFO, 'some info');
syslog(LOG_ERR, 'some error');

And then when debugging script, I just use the following:

journalctl -f -uphp73-php-fpm -uphp-fpm -ureact_php_systemctl_service

While it works okay, often I get more content shown by journalctl that I would like.  Another downfall is segfaults are not displayed, and the only way I have been able to view them is by not including a systemd unit (i.e. -u) and just using journalctl -f, but then I get way more content that I desire.

Recently, I was running some script and none of my units (i.e. -uphp73-php-fpm -uphp-fpm -ureact_php_systemctl_service) filtered it.

I then tried journalctl -f | grep PublicAPI, and while it worked, errors didn't show as red and I expect it just isn't the right way to do it.

Next I tried journalctl -ft PublicAPI, and it seemed like a better approach.

How should I be doing this?  How can I filter just segfaults when something is not going right?  Should I be filtering by unit and how can I identify what unit to use?  Is a better approach to filter by user (not sure if possible)?


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My first reaction would be "don't use syslog for regular logging". It's fine for important things, but miscellaneous info and error messages can get lost in the sea of other activity.

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