replacing rsyslogd in minimal with journald [was Re: systemd requires HTTP server and serves QR codes]

Kevin Fenzi kevin at
Thu Oct 11 02:23:07 UTC 2012

On Thu, 11 Oct 2012 01:48:07 +0200
Lennart Poettering <mzerqung at> wrote:

> These two are much better implemented via explicit time seeks. The
> journal APIs support that just fine, journalctl currently
> doesn't. However it's trivial to add that based on the lower level
> APIs, the only thing that stopped me from doing that so far is that
> for that we'd have to come up with a nice way to parse calendar
> timestamps, and I want to be careful about that. that said the idea
> is to have two command line args to journalctl where you can pass
> things such as:
> $ journalctl --start-time=2012-10-01
> ...
> $ journalctl --start-time=-5d
> ...
> $ journalctl --start-time=2012-01-01 --end-time=2012-05-02
> ...
> And this would do the right things. Since the journal will coalesce
> the current journal and the rotated ones into one this will simply
> show you everything that matches.

Sounds great. 

> Of course the time expressions for this need to be powerful enough so
> that people can trivially express things like "everything from today",
> or "everything since two weeks ago" and suchlike.

Yeah, I am reminded (pardon the pun) of the 'remind' program that did
this very well. 

> > "This thing might have messed up when I last booted... uptime shows
> > 16 days"
> For this we already have "journalctl -b" which only shows messages
> from the current boot. We'll probably extend that later so that you
> can pass "journalctl -b4" or so which would show you the messages
> from 4 boots earlier only.


> The takeaway here is that rotation is not a feature for finding
> things. There are much better ways to find things and we should make
> them available, and we can, because the backend allows that.

Right, which is why I was trying to move to use cases over just asking
for time rotation. ;) If these use cases can be solved better ways,
thats just fine with me. 


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