how to clear DNS cache in 22.04?

Question

How is the DNS cache cleared in 22.04?

The method that worked in 20.04:

systemd-resolve --flush-caches

no longer works.

Artur Meinild · Answer 1 · 2022-07-29T10:21:40.310

53

Newer versions of Ubuntu use this syntax (run as root or with sudo):

resolvectl flush-caches

(This will also work in Ubuntu 20.04.)

edited Jul 29 '22 at 10:21

answered Apr 25 '22 at 20:07

Artur Meinild

2

I'm on a freshly installed 22.04 and this command did not clear whatever DNS cache dig is using. – Basti Mar 28 '23 at 07:30
dig doesn't have a cache. dig queries a nameserver directly. The nameserver is probably caching things, but dig has no control over that. – James Moore Dec 13 '24 at 23:50

score 17 · Answer 2 · answered Jul 29 '22 at 10:29

17

For Ubuntu 22.04 users, follow the below command to flush DNS Cache(resolvectl) :

resolvectl flush-caches

To check the cache size run the below command:

resolvectl statistics

answered Jul 29 '22 at 10:29

Stanley

Failed to get DNSSEC supported state: Unit dbus-org.freedesktop.resolve1.service not found. – Neil McGuigan Jun 03 '24 at 16:15

2 Answers2