![在 Ubuntu 中刷新 DNS 缓存](https://linux22.com/image/540841/%E5%9C%A8%20Ubuntu%20%E4%B8%AD%E5%88%B7%E6%96%B0%20DNS%20%E7%BC%93%E5%AD%98.png)
哪个命令可用于刷新 Ubuntu 中的 DNS 缓存?
答案1
默认情况下,Ubuntu 没有缓存 DNS 查询。
如果您使用远程 DNS 服务器,那么您就没有机会更新其缓存。
如果你安装本地服务器。BIND:
rndc flush
nscd:
service nscd reload
dnsmasq:
/etc/init.d/dnsmasq restart
答案2
在我的 ubuntu 11.04 中,我运行了这个:/etc/init.d/dns-clean
清理 dns 其内容如下:
#! /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