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Flush DNS cache on Ubuntu

This weekend I came across several pages on the web suggesting ways to flush the DNS cache on Ubuntu. I will not point to the offending pages here but they are easy to find with Google. Most of them are wrong in several ways.

  1. Ubuntu doesn’t install a DNS cache by default
  2. Most of the pages say something along the lines of to flush the DNS cache you need to restart the nscd deamon.
  3. See 1
  4. As a result of 1 – They tell you to install nscd so that you can then restart nscd!
  5. I redirect your attention to issue 1.

If you really want a local cache then I would suggest installing unbound which will work better and give you DNSSEC as well.

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