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

From Dan Ritter <dsr@randomstring.org>
Newsgroups linux.debian.user
Subject Re: sudo slow on DNS lookup, with invalid resolv.conf entries
Date 2017-09-15 23:10 +0200
Message-ID <uq626-8sF-31@gated-at.bofh.it> (permalink)
References <uq1lM-5ih-9@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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

You should have a localhost entry in /etc/hosts. If you have
configured your /etc/sudoers to specify "localhost.localdomain",
then you should also have a localhost.localdomain entry in
/etc/hosts, or your should change the sudoers config to just 
reference "localhost".

-dsr-

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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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