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