On Thu, 9 May 2013, Fajun Chen wrote:
Resending original reply without debugging logs since it was blocked
waiting for approval (message size over 512k).
Thanks,
Fajun
On Thu, May 9, 2013 at 2:52 PM, Fajun Chen <[email protected]> wrote:
On Thu, May 9, 2013 at 11:34 AM, David Lang <[email protected]> wrote:
On Thu, 9 May 2013, Fajun Chen wrote:
On Wed, May 8, 2013 at 9:22 PM, David Lang <[email protected]> wrote:
On Wed, 8 May 2013, Fajun Chen wrote:
iptables block setting didn't work for some reason.
what do the iptables rules on that system look like?
without seeing them, my guess is that there is a rule already there that
allows packets related to a known connection that are getting applied
(and
therefor accepting the packets) before the deny rule you are trying to
put
in place takes effect.
The same problem exists on 5.8.6 with iptables blocking. One minor
detail:
the queued files reached the limit of 96M, it's reduced to 95M after the
firewall was unblocked, but it stays at 95M on the client without
flushing.
I can use logger to send new log messages to the server, so network
connection is not an issue.
7.3.14 seems to be working with iptables blocking.
hmm, I don't understand how it could be different for different versions
of rsyslog. the iptables filtering should be happening by the OS and
wouldn't care what version of software is running.
iptables filtering issue had been resolved by restarting rsyslog for the
firewall changes to take effect.
Ok, that is almost certinly the 'established connection' thing that I was
speculating about.
rsyslog version has nothing to do with iptables filtering. What I referred
to was that rsyslog 5.8.6 doesn't flush queued files while 7.3.14 does when
iptables filtering was changed from blocking to unblocking.
ahh, Ok.
At this point 5.8.6 is old enough that it's well past being supported, so let's
work on the current version.
As a alternative testing, I stopped rsylogd on the remote server and the
logs were queued on the client as expected. I started rsyslog on the
remote
server once the disk queue on the client is filled up. I did see the
queue
files were flushed to the remote server once rsyslog is back to
service. So
this seems to be related to rsyslog configuration change.
My guess (without knowing the code well) is that the queued messages are
somehow queued for the specific destination (IIRC you had this queue
setup
as an action queue, not as the main queue, you posted your config, but I
have already deleted those messages). I'd be curious to see if you have
the
same problem spilling the main queue to disk.
Just for your reference, here's my rsyslog configuration:
# start forwarding rule 1 of 1
$ActionQueueType LinkedList
$ActionQueueFileName srvrfwd
$ActionResumeRetryCount -1
$ActionQueueSaveOnShutdown on
$ActionQueueMaxDiskSpace 100000000
$ActionQueueSize 200000 # Tried 100000 as well
$ActionQueueHighWaterMark 600
$ActionQueueLowWaterMark 200
$ActionQueueTimeoutEnqueue 1
#local5.* :omrelp:127.255.255.1:20514 # Invalid IP to trigger log
buffering
local5.* :omrelp:172.17.5.28:20514 # Real IP to trigger log
forwarding
# end forwarding rule 1 of 1
On the other hand, as I noted in the first report, when I changed
rsyslog
configuration before disk space limit is reached, the queued files were
flushed to the remote server without issues.
very interesting, and probably a bug.
Let me know if you need debugging logs to troubleshoot it.
Ranier will need probably need to get involved with this, but he's super
busy the next 2-3 weeks with a very high priority deadline (the "every
waking hour" type of project)
It wouldn't hurt to take a look at the debug logs for the copy started
after the config change.
Rsyslog debugging log is attached here. This was collected by running
"rsyslogd -dn" when the remote server IP was set to valid. Please let me
know if you want me to submit bug tracking item.
you can e-mail it to me directly
by the way, are you sure you are doing a full restart after the config
change? a -HUP does not cause rsyslog to do a full restart and re-read it's
config file, it just causes rsyslog to close and re-open it's outputs (a
full restart takes a long time and can cause messages to be lost)
I did "service rsyslog restart" after the config change. "Kill timeout 5"
is set in /etc/init/rsyslog.conf. I'm not sure if this timeout setting
could make a difference.
this should do it. but just to be sure, do a stop (make sure it's finished
shuttng down), then a start
We need the initial startup logs to be queued before remote logging
server
is set. Switching from invalid IP to valid IP in rsyslog configuration
was
chosen to meet this requirement.
Is there any chance of re-ordering the startup sequence to get the
config
first, then start rsyslog, then start everything else? kernel messages
will
get queued for quite a while, so they shouldn't be an issue. The only
issue
would be any other applications that need to write logs very early on.
The problem is that we don't know remote logging server at startup, so we
need the capability to buffer the logs until the remote server is set by
user later. Understood that the logs could get lost after the disk space
limit is reached. Is there any way to achieve this without rsyslog
configuration change?
one possibility would be to just write the logs to a file and then use
imfile to read this file later to send them upstream, but I'm not sure if
imfile has gained the capability to get all it's data from the file yet.
Historically, imfile only read the message content from the file, it
generated the timestamp, hostname, priority, and severity information
itself. I know there was talk about having an option to have imfile parse
this from the file, but I don't know if it ever happened.
If nothing else, you could write messages to a file with the
RSYSLOG_ForwardFormat and then use netcat or similar to read the file and
spit it out over the network later, but that wouldn't be able to use RELP
to send it. I guess you could use netcat to send it to a UDP listener on
localhost and then have the logs sent out via RELP from there.
There should be some way to feed the logs to /dev/log, but I'm not sure
exactly how to do that.
Thanks for all your suggestions. Data completeness and integrity is very
important in our use cases. I'm not sure how some of the logging
information such as originial timestamp would change when it's routed
around. If this is confirmed to be a bug and can be fixed in 1-2 months, I
would much rather to wait for the fix.
Well, if you feed the data to syslog with the timestamp, it will preserve the
existing timestamp by default.
David Lang
Thanks,
Fajun
On Wed, May 8, 2013 at 11:56 AM, David Lang <[email protected]> wrote:
On Wed, 8 May 2013, Fajun Chen wrote:
I upgraded ubuntu rsyslog to 7.3.14 and still got the same issue.
My test procedure:
Clean log file. Set remote host IP to 127.255.255.1 (invalid IP) in
rsyslog conf. service rsyslog restart followed by logger in a loop. The
disk queue files are buffered but are limited to 96M overall. Set remote
host IP to valid IP. service rsyslog restart. I expect the queued files to
be flushed to the remote host but these files are still in the queuing
directory.
This may be a silly thought, but the fact that you are changing the
configuration between these two steps could be part of the problem.
I would suggest that instead of changing the config to enable/disable
sending the logs that you instead keep the rsyslog config the same and set
iptables rules to block and unblock the communications.
______________________________**_________________
rsyslog mailing list
http://lists.adiscon.net/**mailman/listinfo/rsyslog<http://lists.adiscon.net/mailman/listinfo/rsyslog>
http://www.rsyslog.com/**professional-services/<http://www.rsyslog.com/professional-services/>
What's up with rsyslog? Follow https://twitter.com/rgerhards
NOTE WELL: This is a PUBLIC mailing list, posts are ARCHIVED by a myriad
of sites beyond our control. PLEASE UNSUBSCRIBE and DO NOT POST if you
DON'T LIKE THAT.
_______________________________________________
rsyslog mailing list
http://lists.adiscon.net/mailman/listinfo/rsyslog
http://www.rsyslog.com/professional-services/
What's up with rsyslog? Follow https://twitter.com/rgerhards
NOTE WELL: This is a PUBLIC mailing list, posts are ARCHIVED by a myriad of
sites beyond our control. PLEASE UNSUBSCRIBE and DO NOT POST if you DON'T LIKE
THAT.
_______________________________________________
rsyslog mailing list
http://lists.adiscon.net/mailman/listinfo/rsyslog
http://www.rsyslog.com/professional-services/
What's up with rsyslog? Follow https://twitter.com/rgerhards
NOTE WELL: This is a PUBLIC mailing list, posts are ARCHIVED by a myriad of
sites beyond our control. PLEASE UNSUBSCRIBE and DO NOT POST if you DON'T LIKE
THAT.
