Flush Your DNS Cache (updated 2023)

TL;DR

Here is how you can clear your DNS cache in Linux Mint 21 (updated part):

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sudo resolvectl flush-caches

Here are two ways to clear your DNS cache in Linux Mint 19 (for posterity):

1. Using systemd-resolve

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sudo systemd-resolve --flush-caches

2. Using dns-clean

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sudo /etc/init.d/dns-clean start

Source

• https://vitux.com/how-to-flush-the-dns-cache-on-ubuntu/

The Rest of the Story

So this is more for me to have this documented. Yeah, I could make a bookmark, but you never know ;-) The original commands for Linux Mint 19 came from this post, so a big thank you to that author. I was using Linux Mint 19, and as the original article says, the old commands worked in vanilla Ubuntu 18.04 LTS as well.

The new commands, well, I forget where I originally found them 😇️.

Here are the different ways to clear your DNS cache.

In Linux Mint 21 (updated part):

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sudo resolvectl flush-caches

This can be verified by running:

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resolvectl statistics

And the results for that should look something like this after clearing the DNS cache:

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DNSSEC supported by current servers: no

Transactions
Current Transactions: 0
  Total Transactions: 19364

Cache
  Current Cache Size: 0
          Cache Hits: 1234
        Cache Misses: 8675

DNSSEC Verdicts
              Secure: 0
            Insecure: 0
               Bogus: 0
       Indeterminate: 0

In Linux Mint 19 (for posterity):

1. Using systemd-resolve

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sudo systemd-resolve --flush-caches

And you can verify that worked by running the command below, and verifying that the “Current Cache Size” is “0” (zero).

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sudo systemd-resolve --statistics

2. Using dns-clean

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sudo /etc/init.d/dns-clean start

Conclusion

That’s it, no need to restart your computer; your DNS cache is clear!

End of Line.