On Fri, Jul 17, 2015 at 2:13 PM, David Sommerseth <dav...@redhat.com> wrote:
> > Hi, > > I'm looking through some journals now, and even though I've seen it a > few times I haven't thought about it until now. > > systemd-journal[1151]: Runtime journal is using 8.0M (max allowed > 4.0G, trying to leave 4.0G free of 63.7G available → > current limit 4.0G). > > Could this line be cleaned up so you don't have to look up a man page to > try to figure out what this really means? Here's my uneducated guess > and confusion of this line: > > * Runtime journal is using 8.0M > - Okay, so currently the journal uses 8MB of disk-space. No problem. > > * max allowed 4.0G > - Okay, so the journal should not grow beyond 4GB, makes sense. No > problem. > > * trying to leave 4.0G free of 63.7G available > - Uhm, what!? So it will grow until there is 4GB left on the > filesystem? Not so okay. > It chooses the /smallest/ limit, not largest. (Common sense...) For example, if you had only 5 GB space available, the journal would not grow beyond 1 GB. > * current limit 4.0G > - Ehh ... okay ... so make up your mind, please! So will the > journal grow until 4GB or 59.7GB. > This *is* it making up its mind: "min(limit 1, limit 2) → resulting limit" But then I looked into /var/log/journal ... > > # du --si -s /var/log/journal/ > 4.3G /var/log/journal/ > > I do see that both system,journal and user-UID.journal are both 8.4MB, > and from that I can guess what the log entry tried to tell me with > "Runtime journal" ... but how is /that/ information useful for me, from > a sys-admin point of view? > "Runtime" here means /run, as opposed to persistent in /var. They have separately configurable limits, since /run is in RAM and /var is usually on disk. (Though, I'm not entirely sure what purpose the runtime journal even serves, when /var is available.) -- Mantas Mikulėnas <graw...@gmail.com>
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