On Wed, 23 Oct 2013, Pavel Levshin wrote:
IMHO, for high-load TCP, rebindinterval is counter-productive, because you
need to establish a new connection each time. But yes, this parameter exists.
rebindinterval is how many messages you send over each connection, you would
only have to set a new connection each time if you set it to 1. you should set
it to something that approaches a second or so of traffic (or at least a
significant fraction of a second, keep in mind low traffic periods if you want
your traffic still balanced then)
Load balancing is very dependent on nature of your load, on your bottlenecks,
and so on. Why do you want to balance TCP connections?
because the system he is sending to doesn't have the capacity to handle the full
feed, so he wants to spread the traffic over multiple machines. To do so, he
needs to have the TCP connection re-established periodically to give the load
balancer a chance to redistribute traffic.
David Lang
--
Pavel Levshin
23.10.2013 23:26, Erik Steffl:
What are recommendations for use of rsyslog with loadbalancers? We have
setup where number of machines run rsyslog and forward syslog messages to
central location using RELP protocol (using omrelp module).
The central location is a load balancer with cluster of machines behind it
(that run rsyslog and use imrelp).
I assume this is not an uncommon scenario so hoping that there is a way to
do this in a way that does load balancing.
The problem is that TCP connection stays open for a long time so there is
effectively no load balancing done. Looking for a solution I found
http://www.rsyslog.com/load-balancing-for-rsyslog/ which mentions
RebindInterval which is documented in omfwd docs
http://www.rsyslog.com/doc/omfwd.html
However I don't see RebindInterval in omrelp docs
http://www.rsyslog.com/doc/omrelp.html and when I try to use it rsyslog
segfaults (in relpCltHintBurstEnd in librelp.so.0, also sent email
specifically about that).
Should RebindInterval work for omrelp? Or is there some other way to
re-open TCP connection so that load balancing works?
Thanks!
erik
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