Flushing Stale DNS in Unix

In case anyone else needs this information, I’ve just figured out that

1
ipconfig /flushdns

that we use in the Windows world translates to

1
lookupd -flushcache

in Unix/Linux/Mac OS X/BSD.

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Aaron Brazell

Aaron Brazell is a Baltimore, MD-based WordPress developer, a co-founder at WP Engine, WordPress core contributor and author. He wrote the book WordPress Bible and has been publishing on the web since 2000. You can follow him on Twitter, on his personal blog and view his photography at The Aperture Filter.

6 thoughts on “Flushing Stale DNS in Unix”

  1. It does?

    I certainly don’t have any “lookupd” on any of my Linux boxes.

    As far as I know, Linux (and most other Unix variants) doesn’t cache DNS lookups at all; however, individual applications might do so. Firefox is notorious for this.

  2. Yeah and actually it’s on CentOS as well as OS X. I’ve used it quite a bit recently. Generally the times I need it come when I start hardcoding /etc/hosts to migrate blogs, etc. Happens in Firefox and Safari, so… yeah. :)

  3. rndc flush deals with the nameserver itself, not the workstations which use the nameserver.

    In any case, I still haven’t even been able to FIND a lookupd on CentOS. What package is it in?

    It certainly sounds like you’re doing absolutely nothing — or something quite different from Windows.

  4. Michael, you’re right. My bad. I thought I had used it on our servers but I hadn’t and it’s not on Linux (will update entry). It’s a BSD sysutil (and thus on OS X).

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