How can I flush the DNS on Ubuntu 17.04? [SOLVED]

Question

How can I flush the DNS on Ubuntu 17.04?

I seem to have a few DNS issues at the moment since upgrading to 17.04 from 16.10 and went to flush the DNS but I can't find how to.

Can anyone tell me please?

UPDATE

I was having so many issues with DNS that I came across this article.

So I tried the mentioned changes and DNS seems to be behaving now.

$ sudo rm -f /etc/resolv.conf
$ sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
$ reboot

I ran into the same thing yesterday. This took care of my issue: superuser.com/a/1200745 — Clay Oster, Apr 19 '17 at 14:01

Dmitry Sidorenko · Accepted Answer · 2017-04-27 09:43:06Z

up vote 25 down vote accepted

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

answered Apr 26 '17 at 14:51

Dmitry Sidorenko

36624

This answer improves on the previous one so I have marked it as the one true answer. – dibs Apr 26 '17 at 21:54

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tigs001 · Answer 2 · 2017-04-21 22:24:45Z

up vote 9 down vote

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.

answered Apr 21 '17 at 22:24

tigs001

1012

That seems to have fixed the issue. Thanks! – dibs Apr 23 '17 at 1:32

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