Howto clear/Flush DNS Cache in Ubuntu
Posted by admin on January 10th, 2008 
Email This Post
Why would you clear your cache?
Most DNS clients will cache the results of name resolution request to speed up multiple lookups to the same URL. Just think about how many requests are made to the same domain when visiting a single web page. Every file, image, style sheet, etc. that is on that page and served from the same domain requires a DNS lookup.
So if you have an invalid DNS entry cached on your local client you’ll need to flush it out of the cache so your client can do a new lookup and get the correct information. Or your other option is to wait until that DNS entry expires and the cache flushes it automatically… which typically takes about 24 hours.
In ubuntu if you want to flush DNS cache you need to restart nscd daemon
Install nscd using the following command
sudo aptitude install nscd
Flush DNS Cache in Ubuntu Using the following command
sudo /etc/init.d/nscd restart
If you want to be notified the next time we write something please subscribe to our RSS feed.Thanks for Visiting!
May 30th, 2008 at 10:50 pm
admin@admin-machine:~$ sudo /etc/init.d/nscd restart
[sudo] password for admin:
sudo: /etc/init.d/nscd: command not found
admin@admin-machine:~$
June 2nd, 2008 at 8:38 am
My Ubuntu Hardy Heron 8.04 gave the same error as stated by Nevinka.
hammerhead@HammerHead:~$ sudo /etc/init.d/nscd restart
[sudo] password for hammerhead:
sudo: /etc/init.d/nscd: command not found