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I am sorry if there's already a thread about this. I tried my best looking for the same ubuntu version but I only saw this: After modifying /etc/hosts which service needs to be restarted?

We're using ubuntu 16.04.06.

Do I have to restart my services after some edit/config?

I'm sorry again if I only need a confirmation about my problem. Thank you for the help

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  • I suggest you check you've applied all updates, 16.04.7 was released back in August 2020 (fridge.ubuntu.com/2020/08/14/ubuntu-16-04-7-lts-released), so a fully-upgraded 16.04 system should report itself as 16.04.7 (the 13-August-2020 date is the ISO release date, an installed system usually reports 16.04.7 before that date when updates are applied).
    – guiverc
    Dec 24, 2020 at 23:47
  • Thank you for your suggestion. I appreciate it!
    – Quequequee
    Dec 27, 2020 at 5:13

1 Answer 1

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No, you don't need to restart anything after making changes. If the DNS is still cached somewhere then you may want to clear it. As far as I know, with normal operation, that's it.

To clear systemd-resolve's cache:

sudo systemd-resolve --flush-caches

If you want to verify that you cleared it out:

sudo systemd-resolve --statistics

It should read:

Current Cache Size: 0

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  • Will try this one, thank you for confirming.
    – Quequequee
    Dec 1, 2020 at 3:18

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