Date: Tue, 11 Oct 2022 16:41:18 -0400 (EDT) From: Doug Denault <doug@safeport.com> To: Paul Procacci <pprocacci@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: resolv.conf question Message-ID: <alpine.BSF.2.00.2210111630040.66282@bucksport.safeport.com> In-Reply-To: <CAFbbPug83%2BxyjZoR%2BOZ1HqnzDCptmqLFbZ7vThgP9=O6QjF-KA@mail.gmail.com> References: <alpine.BSF.2.00.2210111300120.66282@bucksport.safeport.com> <CAFbbPug83%2BxyjZoR%2BOZ1HqnzDCptmqLFbZ7vThgP9=O6QjF-KA@mail.gmail.com>
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This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --0-1475784876-1665520878=:66282 Content-Type: TEXT/PLAIN; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8BIT On Tue, 11 Oct 2022, Paul Procacci wrote: > On Tue, Oct 11, 2022 at 1:03 PM Doug Denault <doug@safeport.com> wrote: > I have a resolve.conf specifying two name servers. The first one is in the > same data center, the second one is an Amazon virtual server. I had to > reboot a jail system. As Murphy would have it the local nameserver for some > reason did not answer when the jails were started. > > I had assumed that if server one was not available the after the fail time > server two was tried. This only happened for the first jail. The linux > writeups (as I understand them) would seem to imply the second server > should be tried. > > So I tried to RTFM, /usr/src/contrib/ldns/resolver.c in this case. It is > almost certain that the system was up but bind did not respond. The source > is a bit above my pay grade but it did seem possible that if that was the > case, the second server was never tried. This is what actually happened. > > There were no other issues as each of the jails started fine with a manual > boot. Does anyone know if the timeout and/or retry setting offer a way > around this. > > _____ > Douglas Denault > http://www.safeport.com > doug@safeport.com > Voice: 301-217-9220 > Fax: 301-217-9277 > > Hi Doug, > > They are certainly tried in succession. > > If you couldn't resolve a given name, then something was certainly wrong. > For testing, had you tried moving the second to the first? > > I'd bet the result would have been the same and there was instead > something else going on. Thanks Paul. For performance reasons, especially if the first listed server is always used, I want that in our data center. Aside from speed, no hacking is possible. My purpose here is to figure how resolv.conf works. If more than one entry is effectively useless, I would be tempted to use 8.8.8.8. Also the jail mother had not been booted in several months and only now because I f-ed up changing the root password. _____ Douglas Denault http://www.safeport.com doug@safeport.com Voice: 301-217-9220 Fax: 301-217-9277 --0-1475784876-1665520878=:66282--
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