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Re: sudo slow on DNS lookup, with invalid resolv.conf entries

From Reco <recoverym4n@gmail.com>
Newsgroups linux.debian.user
Subject Re: sudo slow on DNS lookup, with invalid resolv.conf entries
Date 2017-09-15 19:00 +0200
Message-ID <uq28a-5AW-5@gated-at.bofh.it> (permalink)
References <uq1lM-5ih-9@gated-at.bofh.it>
Organization linux.* mail to news gateway

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	Hi.

On Fri, Sep 15, 2017 at 12:46:09PM -0300, x9p wrote:
> 
> I was getting > 30sec to complete "sudo su" on a host. This host had
> invalid entries in resolv.conf and I realized sudo was doing 5 seconds
> lookup on each entry searching for "localhost.localdomain"
> 
> sudo is 1.8.19p1 @ stretch.
> 
> Believe no DNS lookups should be made... even for localhost

While DNS lookups for localhost are unusual any reasonable configured
DNS should have no trouble resolving it. Especially since there are OSes
that try to resolve *everything* by default via including localhost (AIX
comes to mind).

While you mentioned misconfigured resolv.conf I believe your problem
lies somewhat deeper than this.

Specifically I'm interested with:

grep hosts /etc/nsswitch.conf

grep localhost /etc/hosts

Reco

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Thread

sudo slow on DNS lookup, with invalid resolv.conf entries "x9p" <debian-user@x9pneu.com> - 2017-09-15 18:10 +0200
  Re: sudo slow on DNS lookup, with invalid resolv.conf entries Reco <recoverym4n@gmail.com> - 2017-09-15 19:00 +0200
    Re: sudo slow on DNS lookup, with invalid resolv.conf entries "x9p" <debian-user@x9pneu.com> - 2017-09-15 21:30 +0200
      Re: sudo slow on DNS lookup, with invalid resolv.conf entries Reco <recoverym4n@gmail.com> - 2017-09-15 22:00 +0200
        Re: sudo slow on DNS lookup, with invalid resolv.conf entries "x9p" <debian-user@x9pneu.com> - 2017-09-15 23:10 +0200
          Re: sudo slow on DNS lookup, with invalid resolv.conf entries Reco <recoverym4n@gmail.com> - 2017-09-15 23:20 +0200
            Re: sudo slow on DNS lookup, with invalid resolv.conf entries "x9p" <debian-user@x9pneu.com> - 2017-09-15 23:40 +0200
              Re: sudo slow on DNS lookup, with invalid resolv.conf entries Reco <recoverym4n@gmail.com> - 2017-09-16 00:10 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries "x9p" <debian-user@x9pneu.com> - 2017-09-16 01:20 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Gene Heskett <gheskett@shentel.net> - 2017-09-16 02:10 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries "x9p" <debian-user@x9pneu.com> - 2017-09-17 22:40 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries deloptes <deloptes@gmail.com> - 2017-09-17 23:00 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Brian <ad44@cityscape.co.uk> - 2017-09-18 00:10 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Gene Heskett <gheskett@shentel.net> - 2017-09-18 00:50 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries deloptes <deloptes@gmail.com> - 2017-09-18 01:00 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Gene Heskett <gheskett@shentel.net> - 2017-09-18 01:10 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries deloptes <deloptes@gmail.com> - 2017-09-18 09:00 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Reco <recoverym4n@gmail.com> - 2017-09-18 18:40 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries deloptes <deloptes@gmail.com> - 2017-09-18 20:20 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Brian <ad44@cityscape.co.uk> - 2017-09-18 20:50 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Reco <recoverym4n@gmail.com> - 2017-09-18 22:50 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Brian <ad44@cityscape.co.uk> - 2017-09-19 00:00 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries "x9p" <debian-user@x9pneu.com> - 2017-09-18 22:50 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Brian <ad44@cityscape.co.uk> - 2017-09-19 00:00 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries deloptes <deloptes@gmail.com> - 2017-09-18 23:00 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Brian <ad44@cityscape.co.uk> - 2017-09-19 00:00 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Gene Heskett <gheskett@shentel.net> - 2017-09-19 00:10 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Gene Heskett <gheskett@shentel.net> - 2017-09-18 00:50 +0200
                Re: sudo slow on DNS lookup, with invalid resolv.conf entries Brian <ad44@cityscape.co.uk> - 2017-09-18 01:20 +0200
  Re: sudo slow on DNS lookup, with invalid resolv.conf entries Dan Ritter <dsr@randomstring.org> - 2017-09-15 23:10 +0200
    Re: sudo slow on DNS lookup, with invalid resolv.conf entries "x9p" <debian-user@x9pneu.com> - 2017-09-15 23:40 +0200

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