Limpar cache de DNS no Ubuntu

Question

Qual comando pode ser usado para limpar o cache do DNS no Ubuntu?

    

Answer 1

Por padrão, no Ubuntu, não há consulta DNS em cache.

Se você usar o servidor DNS remoto, não terá chance de atualizar o cache.

Se você instalar o servidor local. BIND:

rndc flush

nscd:

service nscd reload

dnsmasq:

/etc/init.d/dnsmasq restart

    

Answer 2

No meu Ubuntu 11.04, eu corri isso: /etc/init.d/dns-clean para limpar dns o conteúdo é o seguinte:

#! /bin/sh

# $Id: dns-clean,v 1.1.1.1 2004/05/07 03:12:59 john Exp $

# dns-clean by John Hasler 1999-2003
# Any possessor of a copy of this program may treat it as if it
# were in the public domain.  I waive all rights.

# This script should be run at bootup to clean up any mess left by 0dns-up.
# It should be run before ppp is started.
# It should never be run while ppp is up.

### BEGIN INIT INFO
# Provides:          dns-clean
# Required-Start:    $local_fs $remote_fs gdm
# Required-Stop:     $local_fs
# Default-Start:     1 2 3 4 5
# Default-Stop:
# Short-Description: Cleans up any mess left by 0dns-up
# Description: 0dns-up often leaves behind some cruft. This Script is meant
#              to clean up any such mess.
### END INIT INFO

PATH=/sbin:/bin:/usr/sbin:/usr/bin

test -f /usr/sbin/pppconfig || exit 0
# We might have a tmpfs /var/run.
mkdir /var/run/pppconfig >/dev/null 2>&1 || true
test -f /etc/ppp/ip-down.d/0dns-down || exit 0

. /lib/lsb/init-functions
. /etc/default/rcS

case "$1" in
  start)
    [ "$VERBOSE" != no ] && log_begin_msg "Restoring resolver state..."
    /etc/ppp/ip-down.d/0dns-down "0dns-clean"
    [ "$VERBOSE" != no ] && log_end_msg $?
    ;;
  stop|restart|force-reload)
    ;;
  *)
        ;;
esac

exit 0