On Tue, 15 Oct 2013, Boylan, James wrote:
Just to clarify, this is only in relation to imfile and the processing of files
to be scraped, not in the omfile with dynafile directory paths correct?
If that is the case, I can only see limited use cases for that feature.
Honestly, administrators should already have the directories in place, most
applications won't even start, let alone be able to create files for Rsyslog
to process, if the directory doesn't already exist. My opinion is if it is
that much effort to replicate then it may not be worth the migration into the
new design.
the case I can see is where you want rsyslog to start really early in the boot
process, but where a drive may not be mounted yet.
an example could be a network attached drive or a shared drive in a failover
situation where the drive only gets mounted when the box becomes active (think
shared fiberchannel attached drive)
If the input is re-checked on HUP, then I could see this still working,
otherwise you need two configs, one for active and one for standby.
David Lang
-- James
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Rainer Gerhards
Sent: Tuesday, October 15, 2013 1:06 AM
To: rsyslog-users
Subject: Re: [rsyslog] imfile and non-existing directories
On Tue, Oct 15, 2013 at 7:12 AM, David Lang <[email protected]> wrote:
On Mon, 14 Oct 2013, Rainer Gerhards wrote:
Hi all,
I would like to get some feedback. As you may know, I am currently
refactoring imfile to support inotify. One side-effect of the
previous polling implementation causes me some headache:
Currently, imfile simply tries to open the file during each polling
interval. As a consequence, it is able to monitor files even if the
directory path leading to them is not always available (most
importantly it must not be available on startup).
Building this behaviour with inotify requires quite some code. So
question
now: do you think this is essential functionality? Is somebody
actually using it?
Side-Note: I call it "side-effect", as this behaviour was never
spec'ed, intended, or designed -- it just happens this way due to how
polling currently works.
Is this just if the directory is not reachable, or if the file isn't there?
just the directory. The file not being there is actually very typical - for
example, it hapens each time a file is rotated away.
The new imfile inotify mode thus will monitor the directory, and re-enable a
file when it is (re)created. But with missing directories, I need to do this
recursively over potentially many layers.
I am still a bit concerned that this feature might have some use cases, even
though it was never desired - think about things where everything is setup but
the actual structure is created later at runtime of the various application
(containers)...
As a compromise, I think I will at least in the early versions have the ability
to select the old-style polling mode even though inotify is available.
Rainer
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