From: Eric Wong <normalperson@yhbt.net>
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: Unicorn and HAProxy, 500 Internal errors after checks
Date: Wed, 1 Dec 2010 16:52:07 +0000 [thread overview]
Message-ID: <20101201165207.GC12001@dcvr.yhbt.net> (raw)
In-Reply-To: <AANLkTim=DQ7qKBK-r6WKW5P4kvjm8neELKA0BQ-xB6UL@mail.gmail.com>
Pierre <oct@fotopedia.com> 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
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Do not quote signatures (like this one) or top post when replying
next prev parent reply other threads:[~2010-12-01 17:02 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-01 11:59 Unicorn and HAProxy, 500 Internal errors after checks Pierre
2010-12-01 16:12 ` Clifton King
2010-12-01 17:02 ` Pierre
2010-12-01 16:52 ` Eric Wong [this message]
2010-12-01 17:14 ` Pierre
2010-12-01 19:58 ` Eric Wong
2010-12-02 0:42 ` Lawrence Pit
2010-12-02 4:59 ` Eric Wong
2010-12-02 8:38 ` Pierre
2010-12-02 17:39 ` Eric Wong
2010-12-03 8:41 ` Pierre
2010-12-04 23:38 ` Eric Wong
2010-12-05 1:04 ` russell muetzelfeldt
2010-12-06 18:39 ` Eric Wong
2010-12-02 17:41 ` Eric Wong
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