From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS14383 205.234.109.0/24 X-Spam-Status: No, score=-0.5 required=5.0 tests=AWL,MSGID_FROM_MTA_HEADER, RP_MATCHES_RCVD shortcircuit=no autolearn=unavailable version=3.3.2 Path: news.gmane.org!not-for-mail From: Eric Wong Newsgroups: gmane.comp.lang.ruby.unicorn.general Subject: Re: Unicorn and HAProxy, 500 Internal errors after checks Date: Wed, 1 Dec 2010 16:52:07 +0000 Message-ID: <20101201165207.GC12001@dcvr.yhbt.net> References: NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1291222928 10742 80.91.229.12 (1 Dec 2010 17:02:08 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Wed, 1 Dec 2010 17:02:08 +0000 (UTC) To: unicorn list Original-X-From: mongrel-unicorn-bounces@rubyforge.org Wed Dec 01 18:02:04 2010 Return-path: Envelope-to: gclrug-mongrel-unicorn@m.gmane.org X-Original-To: mongrel-unicorn@rubyforge.org Delivered-To: mongrel-unicorn@rubyforge.org Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) X-BeenThere: mongrel-unicorn@rubyforge.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: mongrel-unicorn-bounces@rubyforge.org Errors-To: mongrel-unicorn-bounces@rubyforge.org Xref: news.gmane.org gmane.comp.lang.ruby.unicorn.general:770 Archived-At: Received: from rubyforge.org ([205.234.109.19]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1PNq4B-0003ld-6B for gclrug-mongrel-unicorn@m.gmane.org; Wed, 01 Dec 2010 18:02:03 +0100 Received: from rubyforge.org (rubyforge.org [127.0.0.1]) by rubyforge.org (Postfix) with ESMTP id 91E431858370; Wed, 1 Dec 2010 12:02:02 -0500 (EST) Received: from dcvr.yhbt.net (dcvr.yhbt.net [64.71.152.64]) by rubyforge.org (Postfix) with ESMTP id ADCF418582EE for ; Wed, 1 Dec 2010 11:52:07 -0500 (EST) Received: from localhost (unknown [127.0.2.5]) by dcvr.yhbt.net (Postfix) with ESMTP id 2606B1F677; Wed, 1 Dec 2010 16:52:07 +0000 (UTC) Pierre wrote: > Hi, > > This morning, while checking for a correct deployment, we found out > that the Unicorns we are using were sending 500 Internal errors very > frequently to the HAProxy that sits in front of them. After some > investigation, It turned out that HAProxy checks the backend by > opening and closing a connection to the unicorn. Unfortunately the > Unicorns we use ( v 0.990.0 ) will try to reply to this probe by a > 500, resulting in the error being sent to the HAProxy when the proxy > has already close the connection. Hi Pierre, HAProxy should be configured to send proper HTTP checks and not just TCP connection checks, the problem will go away then. Also, I can not recommend HAProxy unless you're certain all your clients are on a LAN and can be trusted to never trickle uploads nor reading large responses. -- Eric Wong _______________________________________________ Unicorn mailing list - mongrel-unicorn@rubyforge.org http://rubyforge.org/mailman/listinfo/mongrel-unicorn Do not quote signatures (like this one) or top post when replying