My answers inline. On Fri, Aug 30, 2013 at 11:30 AM, Sebastian Fohler <[email protected]> wrote: > at first, sorry, I meant to say hi, but I had a very long night and it seems > I have missed it.
sorry on my side as well, but I'm fed up by unpolite people which asks for help but don't say hi or thanks or even if the solution works. > About the html. Thunderbird has a default html and txt message setting by > default, normaly I change that, but as I said, I had a long night. The next > time I'll remember that. Thanks. > Concerning the load balancing, I have experience with load balancing, and > yes I knew it was a backend Problem. So why pointing HAProxy ??? Your sentence: "it's definitly a problem of haproxy shuting down the backends" > Most of the backends have been shown as > down in my stats, as I already written in my last message. The only thing I > thought strange was, that one was shown up and still got me that 503 error. 503 is a consequence of no servers available. > About that debugging, that was the question. How much information does > HAProxy provide to find the error concerning those backend health checks and > shuting down those systems. > I've set the log to debug mode but everything I got were this sort of log > entries: > > Aug 30 09:48:49 localhost haproxy[17568]: Connect from 81.44.136.142:54570 > to 192.168.48.12:80 (www.adworxs.net-merged/HTTP) enable health check logging and turn on http logs. You'll have very useful information then. > So I couldn't find the reason, why all the backends have been shutdown. > Obviously cause the check thought they were not availabe, but the problem > is, that the same configuration has been working already. So why pointing HAProxy ???? > I had a network problem yesterday and had to reboot those haproxy systems, > since that moment none of the websites configured did work anymore. can you let us know why a network issue is the source of a system reboot? What type of issue were you experiencing? Since when a reboot fix issues on linux? > So my question was, which log interface gives me the correct information > about the checks and what would be the best way to analyze this problem. Willy explained you in a other mail, tcpdump is your best friend. If for some reason, on any tool, you can't get a debugging mode or you don't know how to enable it, then tcpdump. You'd have seen HAProxy health check request and server response. and I guess in a few second you'll have discovered where the problem is in the response. Sorry, but somebody who disables health check because they "shutdown the servers" deserve some LBing training :p Health check is here to ensure the server is available. If the health check doesn't pass, the traffic is not supposed to pass too... So definitely, disabling heath checking could not have been the solution to your problem. Baptiste > Thank you so far. > Best regards > Sebastian > > > On 30.08.2013 07:38, Baptiste wrote: >> >> Sebastian, >> >> 1. when you talk to a ML, you should say 'Hi' >> 2. when you talk to a ML, you shouldn't send HTML mails >> >> Now, I can see you have absolutely no experience with Load-Balancing. >> Here are a few clues for you: >> - when you have a 503 error, then no need to think, it means ALL the >> servers from the farm are seen DOWN >> - the purpose of the health check is to ensure the service is UP and >> RUNNING on the servers >> - Usually, it is a good idea to enable health checking when >> load-balancing, to allow haproxy to know server status to avoid >> sending client requests to dead servers >> - instead of disabling health checking, you should be troubleshooting >> it: HAProxy logs will tell you why the health check was not working. >> >> Good luck, >> >> Baptiste >> >> >> On Fri, Aug 30, 2013 at 6:19 AM, Sebastian Fohler<[email protected]> >> wrote: >>> >>> Ok, I disabled the health check and it's working now, so it's definitly a >>> problem of haproxy shuting down the backends. >>> >>> On 30.08.2013 05:55, Sebastian Fohler wrote: >>> >>> Some help, would be to disable the health check for the time being, is >>> that >>> possible. >>> At least it would be a quickfix. >>> >>> On 30.08.2013 05:25, Sebastian Fohler wrote: >>> >>> Is there some simple way to find out why I get this error from my haproxy >>> cluster? >>> >>> 503 Service Unavailable >>> >>> No server is available to handle this request. >>> >>> It looks like all my backend servers are down. Even in pools which are >>> shown >>> as up in my stats. >>> How can I debug that sensible? >>> >>> Thank you in advance. >>> Best regards >>> Sebastian >>> >>> >>> > >
