How to flush Linux cache ?

Flushing Linux Caches

Recent versions of Linux (i.e. since 2.6.16) have added the ability to flush their caches. You can run:

$ sync ; echo 3 | sudo tee /proc/sys/vm/drop_caches

DNS cache > How to Flush DNS in Different OS’es?

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There is some ways you can make DNSFLUSH on several operating systems, and here you will se some of that examples.
Most DNS clients cache the results of name resolution requests. This speeds up name resolution if multiple lookups are done to the same address, such as is common when browsing the web. Sometimes a bad
DNS entry will be cached and you will need to either flush the DNS cache to get rid of it, or wait up to 24 hours for it to be dropped from the cache automatically.

• How to Flush DNS in Linux

In Linux, the nscd daemon manages the DNS cache. To flush the DNS cache, restart the nscd daemon.
To restart the nscd daemon, use the command


#$: /etc/rc.d/init.d/nscd restart

• How to Flush DNS in Mac OSX

In Mac OSX, you can use the command lookupd -flushcache to flush the DNS resolver cache.
bash-2.05a$ lookupd -flushcache

• How to Flush DNS in Microsoft Windows

In Microsoft Windows, you can use the command


C:> ipconfig /flushdns to flush the DNS resolver cache.


Windows IP Configuration Successfully flushed the DNS Resolver Cache.




You can also use the command


C:> ipconfig /displaydns to view the DNS resolver cache.

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cache, dns, Linux, MacOSX, Windows