How to Flush DNS cache on Linux
Last updated by Sam K on July 23, 2021 12:11
Linux systems don’t have a DNS cache by default. The different distributions only offer a function to store DNS information locally with the use of appropriate applications like nscd (name service caching daemon), pdnsd, dns-clean, or dnsmasq. If you use one of these services for caching, you have to control it from the terminal in order to clear the cache.
For pdnsd, there’s a concrete clear command:
sudo pdnsd-ctl empty-cache
To clear the DNS cache from dnsmasq, dns-clean, or ncsd, though, you need to completely restart the respective service:
sudo /etc/init.d/dnsmasq restart
sudo /etc/init.d/nscd restart
sudo /etc/init.d/dns-clean restart
To use DNS caching services in Linux distributions like Ubuntu and clear the cache, you need administrator rights.
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