Well, that isn’t quite enough info to go on since we have many farms and
back-ends. However that doesn’t make sense since I know all backends were
available and getting traffic. But we have farms that are handling things I
haven’t been working on so maybe that. Is there an easy way to see a log of
which backend was reporting down?
I moved to farm guardian with the L4XNAT profiles so I am not relying on the
built in checks now. There really never was any question of backend responding,
especially no so consistently as what is in the logs. We’re talking thousands
and thousands of rows (presumably each check) and that means it spans several
days of logs and there isn’t anything that was down anywhere near that much.
I’ve watched the farm guardian logs and everything looks fine.
I did some searching but couldn’t find much info on what looks like some sort
of identifier “b72f6b40” to see if that was logged to a specific farm. I can
narrow down if you give me more info.
- - - - -
Scott Berry
Lead Developer | Boom! Payments
m: 1.661.478.7144
From: Emilio Campos
Reply-To: <zenloadbalancer-support@lists.sourceforge.net>
Date: Monday, August 8, 2016 at 1:32 PM
To: <zenloadbalancer-support@lists.sourceforge.net>
Subject: Re: [Zenloadbalancer-support] Max connections in HTTP profile
No route to host means your lb can't reach the backends, check gateway
configuration and confirm backend is reachable with ping, telnet, etc from lb
to backends and viceversa.
Regards
Sent from mobile
El 8 ago. 2016 10:28 p. m., "Scott Berry" <sc...@boompayments.com> escribió:
Thanks :)
Show that in the admin at the top ;)
Yes, 3.10.1. Grep does not find anything in any log file about “too many”
anything.
I am seeing a lot of these lines:
Aug 4 06:24:49 ZenLB pound: (b72f6b40) connect_nb: error after getsockopt: No
route to host
And occasional bunch of these:
Aug 4 13:39:46 ZenLB pound: NULL get_thr_arg
If that doesn’t help I can see about running some more tests. We are out of
credits for the month but I’m going to see about purchasing more.
- - - - -
Scott Berry
Lead Developer | Boom! Payments
m: 1.661.478.7144
From: Emilio Campos
Reply-To: <zenloadbalancer-support@lists.sourceforge.net>
Date: Monday, August 8, 2016 at 1:02 PM
To: <zenloadbalancer-support@lists.sourceforge.net>
Subject: Re: [Zenloadbalancer-support] Max connections in HTTP profile
Execute
dpkg -l | grep zen
Also check your syslog file maybe you could see "Too many open files"?
Sent from mobile
El 8 ago. 2016 9:58 p. m., "Scott Berry" <sc...@boompayments.com> escribió:
Hi,
I’ve removed the HTTP based farms since they were extremely limited in
connections. When using a tool like loadimpact.com we would see the LB start
slowing down and preventing connections from hitting the back-end servers
around 100-200 connections on the farm. Meanwhile the 4 back-end servers had
zero load and if I hit one directly it was instant response. The L4XNAT profile
had no limitation on the smaller tests, we haven’t hit a larger test yet.
My config was the most basic. Simple HTTP Farm with 4 back-end servers. No real
changes from default config that I can recall.
I can run the similar test again watching syslog and see if there are issues. I
can also fail over to the backup and see if that has an issue.
I don’t know where or how to tell what version of Zen is installed. It isn’t in
the GUI I can see and I can’t find that info online. How to?
- - - - -
Scott Berry
Lead Developer | Boom! Payments
m: 1.661.478.7144
From: Laura Garcia
Reply-To: <zenloadbalancer-support@lists.sourceforge.net>
Date: Sunday, August 7, 2016 at 11:55 PM
To: "zenloadbalancer-support@lists.sourceforge.net"
Subject: Re: [Zenloadbalancer-support] Max connections in HTTP profile
Hi Scott, please share your HTTP configuration. Are you working with 3.10.1?
Also, you can inspect the /var/log/messages searching for some system errors
when the connections reach the limits.
Kind Regards.
Laura Garcia
Zen Load Balancer Team
www.zenloadbalancer.com
On Fri, Aug 5, 2016 at 3:59 AM, Scott Berry <sc...@boompayments.com> wrote:
I assume we are running in to some limitation on max connections although I
can’t find any documentation on Zen or on Pound that discusses this.
We are load balancing a Magento store. Originally I had two farms, one for HTTP
and one for HTTPS. Offloading SSL was one of the major goals.
We did a soft launch and found that at around 200-400 connections on the HTTP
farm the response time slowed to a crawl. None of the servers (Zen, App or DB)
had much load at all. After banging my head around for a while I switched to a
L4XNAT profile (after reading a post somewhere about a clustered Zen setup -
front–end L4XNAT and then back-end HTTP Zen farms) and that seemed to solve the
problem.
So question being firstly, why the limitation and what is causing it? Resources
were never an issue at all.
I am ok with keeping the L4XNAT profile for the HTTP side of things but then
what happens when the HTTPS farm starts needing that kind of connection size? I
would rather not deal with SSL on each server, but if that is the end result I
will. I just can’t see how 400 connections should be a limitation?
Secondly, how now would I handle a redirect in Zen? I would like to get people
off the root and on to WWW and would rather not have to let the traffic pass
all the way back to the app servers before we do that. Almost every first time
connection will be this way. Since I can’t use HTTP farms I can use the virtual
host and redirect options. I suppose the only way is to have a dedicated IP for
www and for root and use another farm just for redirection. But again I worry
about connections… will that then end up with connection limitations? Or not
because it is just redirect and done?
Any input?
- - - - -
Scott Berry
Lead Developer | Boom! Payments
m: 1.661.478.7144
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consuming the most bandwidth. Provides multi-vendor support for NetFlow,
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