How to Clear the DNS Cache on Linux

We can use the resolvectl command with the statistics option to see how many records are in the cache.

resolvectl statistics

Flushing the cache removes all entries, and starts the collection process once more. If there are any, this forcibly removes incorrect and corrupt entries from the cache.

The command is simple; we use resolvectl with the flush-caches option.

resolvectl flush-caches

We're silently returned to the command line. To confirm that something has actually happened, we'll check the DNS cache statistics again.

resolvectl statistics