From owner-freebsd-questions@FreeBSD.ORG Tue Aug 1 19:21:37 2006 Return-Path: X-Original-To: questions@freebsd.org Delivered-To: freebsd-questions@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4689416A4E1 for ; Tue, 1 Aug 2006 19:21:37 +0000 (UTC) (envelope-from wmoran@collaborativefusion.com) Received: from mx00.pub.collaborativefusion.com (mx00.pub.collaborativefusion.com [206.210.89.199]) by mx1.FreeBSD.org (Postfix) with ESMTP id 8D0F743D9B for ; Tue, 1 Aug 2006 19:21:10 +0000 (GMT) (envelope-from wmoran@collaborativefusion.com) Received: from collaborativefusion.com (mx01.pub.collaborativefusion.com [206.210.89.201]) (TLS: TLSv1/SSLv3,256bits,AES256-SHA) by wingspan with esmtp; Tue, 01 Aug 2006 15:21:06 -0400 id 00056419.44CFA9A2.00012CFB Received: from Internal Mail-Server (206.210.89.202) by mx01 (envelope-from wmoran@collaborativefusion.com) with AES256-SHA encrypted SMTP; 1 Aug 2006 15:17:34 -0400 Date: Tue, 1 Aug 2006 15:21:07 -0400 From: Bill Moran To: questions@freebsd.org Message-Id: <20060801152107.eba203fa.wmoran@collaborativefusion.com> In-Reply-To: <000401c6b59e$92d942d0$3c01a8c0@coolf89ea26645> References: <20060801150226.0c911297.wmoran@collaborativefusion.com> <000401c6b59e$92d942d0$3c01a8c0@coolf89ea26645> Organization: Collaborative Fusion X-Mailer: Sylpheed version 2.2.6 (GTK+ 2.8.20; i386-portbld-freebsd6.1) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Subject: Re: Reducing the timeout on a TCP connection X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Aug 2006 19:21:37 -0000 In response to "Ted Mittelstaedt" : > This is why the snmp protocol uses UDP, Bill. > > You need to use something other than TCP for > monitoring. Well ... if I'm monitoring a server that uses TCP (PostgreSQL) I can't rightly establish whether or not it's successfully accepting connections unless I used TCP as well. I understand where you're coming from, but I can't see how I can use UDP to solve my problem. If I have to go back to management and say, "I can't get tighter granularity than 90s" then that's what I have to do. I'm just trying to do my research before I make that claim. In the long run, it's possible that I'll have to put together some sort of client/server monitoring model that has a component on each system, so that I have tighter control over things, but this initial version is required "right now", so I have to make do the best I can, then come back and improve it when there's time (probably over the next several months). If I were trying to make it perfect, I wouldn't have started with PHP ;). I'm using PHP because the development cycle is very fast. This gets me my "quick and dirty" solution, then I can take a little time to look into how to really do it right. I'm just trying to establish exactly how "dirty" it's going to be. Thanks for the input. > ----- Original Message ----- > From: "Bill Moran" > To: > Sent: Tuesday, August 01, 2006 12:02 PM > Subject: Reducing the timeout on a TCP connection > > > > > > I'm writing some monitoring scripts, and I'm having some trouble because > > the TCP seems to wait 90 seconds before giving up on initiating a > > connection. > > > > (The script is in PHP, testing a PostgreSQL database. Neither PHP nor > > libpq (which PHP's PostgreSQL support is based on) seem to have any > > settings that can be used to adjust this timeout). > > > > If my memory of Stevens is correct, this is something that's set at the > > OS level. It doesn't seem as if it's a configurable value, however. > > I guess I'm looking for confirmation on that point first. If that's > > the case, then I'll have to adjust my approach based on that knowledge. > > > > If it can be adjusted, can it be adjusted on a per-connection basis? I > > don't want to mess with timeouts on other sockets, _just_ this one > > monitoring script. > > > > And of course, the final question: how would I adjust this setting if > > it's possible? If it's a sysctl, I'm missing it ... > > > > Suggestions? > > > > -- > > Bill Moran > > Collaborative Fusion Inc. > > _______________________________________________ > > freebsd-questions@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" > > > -- Bill Moran Collaborative Fusion Inc. **************************************************************** IMPORTANT: This message contains confidential information and is intended only for the individual named. 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