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dibs
Asked: 2017-04-19 19:51:26 +0800 CST

How can I flush the DNS on Ubuntu 17.04?

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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?

dns

3 Answers

  1. Best Answer

    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
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  2. 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.

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  3. I made this: https://github.com/dunderrrrrr/dnscache

    Maybe thats what youre looking for.

    Installation

    $ git clone [email protected]:dunderrrrrr/dnscache.git
$ cd dnscache/
$ sudo cp dnscache /usr/local/bin/
$ sudo chmod +x /usr/local/bin/dnscache

    Usage

    There are two arguments that can be passed to the script, clear or stats. Both of them should be self explanatory.

    $ sudo dnscache clear
DNS cache has been cleared!
[...]
Cache
  Current Cache Size: 0
[...]
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