[Dnsmasq-discuss] How do others provide backup for their DNS? Ideas wanted

Chris Green cl at isbd.net
Tue Aug 31 12:35:00 UTC 2021

I run dnsmasq on a Raspberry Pi to provide DHCP and DNS services on my
home LAN. It's just very handy having names for all devices rather
than having to use IP addresses.

A few weeks ago the Pi died (or, more accurately, the SD card it was
running on died) and it took me quite a while to get things back
together again (like half a day or so, mostly down to trying to rush
things).  This isn't "mission critical", nothing awful happened when
we didn't have the Pi providing DNS for half a day but it was 'messy'.

So, I've been wondering how I can help myself sort things out more
easily and quickly if it happens again.  What do others do?

The ways I can think of are:-

    Have an 'image' SD card of the Pi kept up to date somehow so that
    I can either change the SD card in the running Pi or use another
    Pi in place of it.  Problem is how to keep the image up to date.

    Have a 'warm backup' dnsmasq running on another system.  There is
    another Pi on the LAN and also a desktop server both of which are
    on all the time.  How easy is it to replace one dnsmasq system
    with another on the LAN?

    Any other obvious ways?

Thanks for any ideas.

Chris Green

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