On 9/2/21 5:45 AM, Chris Green wrote:
I'm still ruminating on this problem! :-)
A number of people are using docker containers to manage this, one
live dnsmasq in a container is the default DNS/DHCP for the system and
another dnsmasq container is maintained to keep its files in sync with
the running one.
So far so good.
What I don't follow is what happens if/when failure occurs as I don't
see how the replacement dnsmasq instance can appear at the same
address on the LAN. So, unless all systems are rebooted they will
lose DNS won't they?
Hi Chris,
In my other response, I just highlighted how I work around this.
My infrastructure server runs on some other IP. Then, my dnsmasq runs
on 192.168.1.2 as a separate IP from the hosting server. That way it
can always have the same ip regardless of what server it runs on. That
IP is reserved just for DNS/DHCP service. Then no clients have to
change when a failover happens.
E.g. My default dnsmasq instance runs on a system at 192.168.1.2, if I
had a 'clone' docker container on my desktop machine it would be at
address 192.168.1.3. So, if 192.168.1.2 dies and I start the dnsmasq
container on my desktop machine it's at 192.168.1.3 but all machines
on the network are configured (until reboot or DHCP reload time) to
use 192.168.1.2.
Am I missing something very obvious here (probably!).
Just maintaining a Rasberry Pi image and updating the dnsmasq files
on it would actually work better (for me anyway) as I could copy it
out to an actual SD card regularly and all I'd need to do to recover
after a failure would be to plug the SD card into a non-dead Pi and
turn it on.
Yes, in my other thread, you can see that all of the key files for the
system are located under a single directory ( with a directory structure
under that ). So you don't have to have a script that copies a bunch
of locations, just the one making it straight forward.
Michael
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