Date: Fri, 03 Aug 2018 16:56:03 -0500 From: Derek Ragona <derek@computinginnovations.com> To: freebsd-questions@freebsd.org Subject: Re: name resolution puzzle Message-ID: <5B64CF73.4000807@computinginnovations.com> In-Reply-To: <5cbb1cc0-8e3f-2736-755e-d182abfd90e6@kicp.uchicago.edu> References: <5cbb1cc0-8e3f-2736-755e-d182abfd90e6@kicp.uchicago.edu>
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On 8/3/2018 4:41 PM, Valeri Galtsev wrote: > Dear Experts, > > I just noticed some behavior of commands "host" and "nslookup" that > puzzles me. Namely, they do not query /etc/hosts file first, but query > nameserver instead, even though nsswitch.conf order is "files dns": > > $cat /etc/nsswitch.conf | grep hosts > > hosts: files dns > > $ cat /etc/hosts | grep holometer.uchicago.edu > > 128.135.20.84 holometer holometer.uchicago.edu > > $ host holometer.uchicago.edu > > holometer.uchicago.edu has address 128.135.52.70 > > $ nslookup holometer.uchicago.edu > > Server: 128.135.249.50 > Address: 128.135.249.50#53 > > Name: holometer.uchicago.edu > Address: 128.135.52.70 > > > So, it appears, that the commands "host" and "nslookup" go directly to > DNS server, and do not look into /etc/hosts first which I have expected. > > I should mention that other compiled programs do obey the > nsswitch.conf query order. > > > Can someone enlighten me on this? > > > The reason I have different IP in /etc/hosts is: I'm building the box > to migrate some host to, and I'd like to test some stuff that should > work from other machines before I switch DNS records to new IP. So, on > these external machines I am trying to have hostname resolve into > future IP just by adding it to /etc/hosts. > > Thanks. > Valeri > Do a: man 5 hosts You have the wrong order in your /etc/hosts file you have: 128.135.20.84 holometer holometer.uchicago.edu Should be: 128.135.20.84 holometer.uchicago.edu holometer Also try dig which is more current that nslookup. -Derek --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
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