How can I flush the DNS on Ubuntu 17.04?

You may use this command: sudo systemd-resolve --flush-caches

To verify that flush was sucessfull, use: sudo systemd-resolve --statistics

Sample output:

Cache
  Current Cache Size: 0
          Cache Hits: 101
        Cache Misses: 256

This command should restart the local name service and flush the local DNS cache:

systemctl restart systemd-resolved.service

There is probably a way of getting it to just flush the cache instead of restart, but restart suited my purposes.

Related