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