On 10/21/19 11:32 AM, home user wrote:
> The key to getting good answers is to ask good questions.
Apparently, I'm not quite asking "good questions" this weekend.
I was looking for a more integrated view of journald so I could differentiate
the advice given in this thread, and see how the two approaches provided in
this thread converge or diverge. (Why do I feel like a mathematician right
now?) None of the 4 sources:
the Fedora sys. admin. guide, the digitalocean tutorial, the journalctl man
page, and the journald.conf man page
quite do it, separately or together.
For review, the two approaches are:
A. using journald.conf to customize journald, and
B. (1) "journalctl --flush --rotate"; (2) "rm -rfv /var/log/journal/*/*@*"; (3)
"journalctl --update-catalog --sync".
My first question:
If I use journald.conf to, say (hypothetical values for now):
* have the system start a new journald file each day, and
* delete journald files once they're a month old,
would I still need to do B above, or will A automatically cause the clean-out
of all journald files more than a month old (maybe the next day or after a
reboot)?
Second question:
What is the preferred way of changing the journald configuration? That is, is there some
GUI or tool for that, or do I simply edit "/etc/systemd/journald.conf" using my
favorite editor (vi)?
Third question:
My impression is that approach B is only a temporary fix; "/var/log/journal/"
would eventually get huge again. Am I correct?
It simply sounds as if you want to limit the disk space used by the journal.
Reading the man page you'd see:
SystemMaxUse= and RuntimeMaxUse= control how much disk space the
journal may use up at most. SystemKeepFree= and RuntimeKeepFree=
control how much disk space systemd-journald shall leave free for
other uses. systemd-journald will respect both limits and use the
smaller of the two values.
The first pair defaults to 10% and the second to 15% of the size of
the respective file system, but each value is capped to 4G.
So, yes, the size would grow to 4G where it is capped.
To me, 4G isn't all that huge since I've got plenty of space available.
So, just adjust those parameters to something you're comfortable with.
And, yes, use vi to edit the file.
--
The key to getting good answers is to ask good questions.
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