On Fri, 2 Nov 2018, Rory Toma wrote:
Interesting. It stopped processing for 15 minutes, then started to
spontaneously process incoming packets again,
look at the impstats output, I'll bet that it shows that it started processing
messages again, allowing for more messages to be accepted.
David Lang
Rory Toma via rsyslog wrote on 11/2/18 4:18 PM:
OK, so the submitted maxes out for imtcp at submitted=583161
At this point, rsyslog thinks there are no more messages, even though
tcpdump shows a ton. It's as if imtcp just stops working.
David Lang wrote on 11/2/18 2:58 PM:
On Fri, 2 Nov 2018, Rory Toma wrote:
OK, turned off counter reset. Also, I noticed that when I restarted, if I
waited about 2 minutes for all connections to clear out of FIN_WAIT, et
al... It seems to log better.
Now we wait an hour...
So now I see:
Fri Nov 2 15:52:49 2018: imtcp(110): origin=imtcp submitted=142983
Fri Nov 2 15:52:49 2018: resource-usage: origin=impstats utime=12115102
stime=2320953 maxrss=56332 minflt=16662 majflt=0 inblock=8 oublock=16
nvcsw=37439 nivcsw=99 openfiles=334
Fri Nov 2 15:52:49 2018: main Q: origin=core.queue size=0
enqueued=142983 full=0 discarded.full=0 discarded.nf=0 maxqsize=58676
Fri Nov 2 15:53:49 2018: global: origin=dynstats
Fri Nov 2 15:53:49 2018: forward1: origin=core.action processed=153749
failed=0 suspended=0 suspended.duration=0 resumed=0
Fri Nov 2 15:53:49 2018: forward2: origin=core.action processed=0
failed=0 suspended=0 suspended.duration=0 resumed=0
so this shows 142983 new messages arriving and 153749 processed (do you
have a disk queue somewhere to account for the extra messages??) but at
one point it was 58676 messages behind.
let it run a while to where the throughput slows down and let's see what
it shows.
I expect that the number enqueued will continue to climb, but the number
processed will taper off.
David Lang
David Lang wrote on 11/2/18 2:47 PM:
On Fri, 2 Nov 2018, Rory Toma wrote:
Date: Fri, 2 Nov 2018 15:44:10 -0700
From: Rory Toma <[email protected]>
To: David Lang <[email protected]>
Cc: Rory Toma via rsyslog <[email protected]>
Subject: Re: [rsyslog] Need help with high volume forwarding config
Does this mean that the packets are not even being forwarded?
Fri Nov 2 15:41:59 2018: main Q: origin=core.queue size=0
enqueued=8059 full=0 discarded.full=0 discarded.nf=0 maxqsize=632
so you received 8059 messages
Fri Nov 2 15:42:59 2018: global: origin=dynstats
Fri Nov 2 15:42:59 2018: action-0-builtin:omfwd: origin=core.action
processed=2591 failed=0 suspended=0 suspended.duration=0 resumed=0
and you sent 2591 messages through action 0 (this is why it's good to
have name='something' in the action to be sure you are looking at the
right thing
Fri Nov 2 15:42:59 2018: action-1-builtin:omfwd: origin=core.action
processed=0 failed=0 suspended=0 suspended.duration=0 resumed=0
Fri Nov 2 15:42:59 2018: imtcp(110): origin=imtcp submitted=2591
Fri Nov 2 15:42:59 2018: resource-usage: origin=impstats utime=2954582
stime=383935 maxrss=19192 minflt=5924 majflt=0 inblock=8 oublock=32
nvcsw=3462 nivcsw=7 openfiles=250
Fri Nov 2 15:42:59 2018: main Q: origin=core.queue size=0
enqueued=2591 full=0 discarded.full=0 discarded.nf=0 maxqsize=632
but here it says there were only 2591 messages received, are you
resetting the counters each time? if so, it's probably best not to do
that right now.
David Lang
David Lang wrote on 11/2/18 2:34 PM:
On Fri, 2 Nov 2018, Rory Toma via rsyslog wrote:
We have several rsyslog hosts that forward to a logstash server. It
runs great, then after about an hour, data slows down until we get a
trickle. I did not see anything last time I ran impstats, so I'm
stuck. Here's my config (centos7, rsyslog 8.39) Any advice how to
debug this?
Well, logstash has lots of bottlenecks, is it keeping up or is it
refusing to accept more data?
what does impstats show? does it show the output to logstash being
suspended?
until you know that the recipient is able to receive more logs, I
don't know that it's worth looking at the rsyslog config.
David Lang
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