From owner-freebsd-stable@freebsd.org Tue Jul 14 14:48:00 2015 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E1BAF9A10CA for ; Tue, 14 Jul 2015 14:48:00 +0000 (UTC) (envelope-from paul@gromit.dlib.vt.edu) Received: from gromit.dlib.vt.edu (gromit.dlib.vt.edu [128.173.126.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "gromit.dlib.vt.edu", Issuer "Chumby Certificate Authority" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id BB830965 for ; Tue, 14 Jul 2015 14:48:00 +0000 (UTC) (envelope-from paul@gromit.dlib.vt.edu) Received: from pmather.lib.vt.edu (pmather.lib.vt.edu [128.173.126.193]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by gromit.dlib.vt.edu (Postfix) with ESMTPSA id B0AD56CD; Tue, 14 Jul 2015 10:47:59 -0400 (EDT) Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2102\)) Subject: Re: Circular dependency between local_unbound and ntpd? From: Paul Mather In-Reply-To: Date: Tue, 14 Jul 2015 10:47:59 -0400 Cc: freebsd-stable Message-Id: References: To: krad X-Mailer: Apple Mail (2.2102) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.20 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 14 Jul 2015 14:48:01 -0000 On Jul 14, 2015, at 10:33 AM, krad wrote: >=20 > As >=20 > $ grep REQUIRE /etc/rc.d/ntpd > # REQUIRE: DAEMON ntpdate FILESYSTEMS devfs >=20 >=20 > You could set something similar to the following in the rc.conf >=20 > ntpdate_hosts=3D"a.b.c.d w.x.y.z" > ntpdate_enable=3Dyes Thanks for that suggestion. I assume the "a.b.c.d w.x.y.z" are IP = addresses, not hostnames, otherwise we'd have the same problem. The /etc/rc.d/ntpdate startup script has a "REQUIRE: NETWORKING ..." and = /etc/rc.d/local_unbound has a "BEFORE: NETWORKING" in it, meaning it = will be running before ntpdate runs. That means DNS resolution will = require an accurate clock and, I assume, mean that ntpdate will require = IP addresses, too? So, it still comes down to this: do I need to know the IP address of an = NTP server to be able to use local_unbound safely with NTP? Cheers, Paul. >=20 >=20 >=20 >=20 > On 14 July 2015 at 14:43, Paul Mather > wrote: > I believe I ran afoul of a circular dependency between local_unbound = and ntpd on my 10.2-PRERELEASE system. I use a stock /etc/ntp.conf and = use ntpd_sync_on_start=3D"YES". >=20 > Last night, a BIOS settings reset cause my CMOS clock to go WAY out of = synch for the first time. No problem, I thought: NTP will correct it at = boot. >=20 > Wrong! >=20 > When my system booted, the time was not corrected. Also, DNS = resolution was not working. I figured out it was because local_unbound = relies on an accurately set clock, but the clock could not be set = accurately because my stock ntp.conf requires working DNS resolution to = reach the NTP servers. >=20 > That sounds like a potential circular dependency to me. >=20 > My workaround at the time was to look up 0.freebsd.pool.ntp.org = on another system; stop ntpd; then do a = ntpdate using the IP addresses to set the clock. Once the clock was set = accurately, things were all hunky dory. >=20 > Does anyone have any suggestion for an automatic way around this? I = guess one way would be to put the IP address of an NTP server into my = ntp.conf file, so at least one would be reachable without needing a = working DNS? >=20 > My main concern is for those systems like my Raspberry Pi and = Beaglebone Black that don't have a battery-backed clock. I currently = don't use local_unbound on those, but it seems like I'd encounter this = problem routinely if I did. >=20 > Cheers, >=20 > Paul. > _______________________________________________ > freebsd-stable@freebsd.org mailing = list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable = > To unsubscribe, send any mail to = "freebsd-stable-unsubscribe@freebsd.org = " >=20