8/13/2019 comando_linux_rede_debian.docx

1/2

Parece nada interessante mas as vezes til no caso de um site especifico mudar de servidor.

por isso caso acontea, digitem os comandos abaixo e no sofram com o problema!

digite no terminal: sudo service dns-clean restart

e depois: sudo service nscd restart

How To Flush Linux / UNIX DNS Cache

byNix Crafton January 29, 2008 28 commentsLAST UPDATED June 2, 2012

inBASH Shell,CentOS,Debian / Ubuntu

I'm on a Dial UP Internet connection under Linux and frequent dial up disconnectioncausing dns problems. How do I flush DNS cache under UNIX / Linux distribution

using a shell prompt?

Under MS-Windows you can use theipconfig command to flush dns cache.However,

Linux and UNIX provides various ways to flush cache. Linux can run nscd or BIND or

dnsmasq as the name service caching daemon. Large and work-group servers may use

BIND or dnsmasq as a dedicated caching server to speed up queries.

HowTo: Flush nscd dns cache

Nscd caches libc-issued requests to the Name Service. If retrieving NSS data is fairly

expensive, nscd is able to speed up consecutive access to the same data dramatically and

increase overall system performance. Just restart nscd:$ sudo /etc/init.d/nscd restartOR# service nscd restart

OR# service nscd reload

This daemon provides a cache for the most common name service requests. The default

configuration file, /etc/nscd.conf, determines the behavior of the cache daemon.

Flush dnsmasq dns cache

dnsmasq is a lightweight DNS,TFTP and DHCP server. It is intended to provide

coupled DNS and DHCP service to a LAN. Dnsmasq accepts DNS queries and either

answers them from a small, local, cache or forwards them to a real, recursive, DNS

server. This software is also installed many cheap routers to cache dns queries. Just

restart the dnsmasq service to flush out dns cache:$ sudo /etc/init.d/dnsmasq restart

OR# service dnsmasq restart

Flush caching BIND server dns cache

http://www.cyberciti.biz/tips/about-ushttp://www.cyberciti.biz/tips/about-ushttp://www.cyberciti.biz/tips/about-ushttp://www.cyberciti.biz/faq/rhel-debian-ubuntu-flush-clear-dns-cache/#commentshttp://www.cyberciti.biz/faq/rhel-debian-ubuntu-flush-clear-dns-cache/#commentshttp://www.cyberciti.biz/faq/rhel-debian-ubuntu-flush-clear-dns-cache/#commentshttp://www.cyberciti.biz/faq/category/bash-shell/http://www.cyberciti.biz/faq/category/bash-shell/http://www.cyberciti.biz/faq/category/bash-shell/http://www.cyberciti.biz/faq/category/centos/http://www.cyberciti.biz/faq/category/centos/http://www.cyberciti.biz/faq/category/centos/http://www.cyberciti.biz/faq/category/debian-ubuntu/http://www.cyberciti.biz/faq/category/debian-ubuntu/http://www.cyberciti.biz/faq/category/debian-ubuntu/http://theos.in/windows-vista/flush-dns-cache-with-ipconfig/http://theos.in/windows-vista/flush-dns-cache-with-ipconfig/http://theos.in/windows-vista/flush-dns-cache-with-ipconfig/http://www.cyberciti.biz/tips/how-do-i-improve-dns-performance-on-linuxwindows-desktop.htmlhttp://www.cyberciti.biz/tips/how-do-i-improve-dns-performance-on-linuxwindows-desktop.htmlhttp://www.cyberciti.biz/tips/how-do-i-improve-dns-performance-on-linuxwindows-desktop.htmlhttp://theos.in/windows-vista/flush-dns-cache-with-ipconfig/http://www.cyberciti.biz/faq/category/debian-ubuntu/http://www.cyberciti.biz/faq/category/centos/http://www.cyberciti.biz/faq/category/bash-shell/http://www.cyberciti.biz/faq/rhel-debian-ubuntu-flush-clear-dns-cache/#commentshttp://www.cyberciti.biz/tips/about-us

8/13/2019 comando_linux_rede_debian.docx

2/2

A caching BIND server obtains information from another server (a Zone Master) in

response to a host query and then saves (caches) the data locally. All you have to do is

restart bind to clear its cache:# /etc/init.d/named restart

You can also use rndc command as follows flush out all cache:# rndc restart

OR# rndc exec

BIND v9.3.0 and above will support flushing all of the records attached to a particulardomain name with rndc flushname command. In this example flush all records releated

to cyberciti.biz domain:# rndc flushname cyberciti.bizIt is also possible to flush out BIND views. For example, lan and wan views can be

flushed using the following command:# rndc flush lan

# rndc flush wan

A note about Mac OS X Unix users

Type the following command as root user:# dscacheutil -flushcacheOR$ sudo dscacheutil -flushcacheIf you are using OS X 10.5 or earlier try the following command:lookupd -flushcache

A note about /etc/hosts file

/etc/hosts act as the static table lookup for hostnames. You need to remove and/or

update records as per your requirements under Unix like operating systems:

# vi /etc/hostsSample outputs:

127.0.0.1 localhost

127.0.1.1 wks01.WAG160N wks01

# The following lines are desirable for IPv6 capable hosts

::1 ip6-localhost ip6-loopback

fe00::0 ip6-localnet

ff00::0 ip6-mcastprefix

ff02::1 ip6-allnodes

ff02::2 ip6-allrouters

10.37.34.2 build

192.168.1.10 nas01

192.168.1.11 nas02

192.168.1.12 nas03

#192.168.2.50 nfs2.nixcraft.net.in nfs2

#192.168.2.51 nfs1.nixcraft.net.in nfs1

172.168.232.50 nfs1.nixcraft.net.in nfs1

172.168.232.51 nfs2.nixcraft.net.in nfs2

192.168.1.101 vm01