Date: Fri, 3 Aug 2018 16:41:42 -0500 From: Valeri Galtsev <galtsev@kicp.uchicago.edu> To: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: name resolution puzzle Message-ID: <5cbb1cc0-8e3f-2736-755e-d182abfd90e6@kicp.uchicago.edu>
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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 -- ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++
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