So he would have a pool of TCP connections in parallel, balancing the
load between them. In some cases, it happens naturally when many TCP
clients are exist.
RebindInterval for high-speed TCP is like balancing a water cannon
between people, pointing to one of them at once. Better than nothing,
but still not so good.
--
Pavel Levshin
24.10.2013 2:38, David Lang:
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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