Flushing the dns cache
Saturday, March 6th, 2010As we all know, under windows we can flush the DNS cache with
ipconfig /flushdns
But what is the linux equivalent command? It is so obvious, yet I somehow keep forgetting it. 
Under linux, the standard way to have a daemon reload its configuration, is sending a SIGHUP signal. In case of the name service cache daemon (nscd), this implies flushing its cache!
So you could use the following command to flush the DNS cache if you’re using nscd:
pkill -1 nscd