On Wed, Sep 01, 2021 at 01:04:24PM -0700, Michael wrote: > On 9/1/21 11:45 AM, Chris Green wrote: > > Thanks for the replies. > > > > It does seem that any sort of live failover for DHCP and/or DNS turns > > out to be quite complex. > > > > I am thus thinking that simply having a reasonably quick to start > > 'cold' backup makes sense. I really don't mind if my LAN is DNS and > > DHCP'less for an hour or so, it can cope! > > > > The best idea (and I haven't really thought about the practicalities > > yet) I have had so far is a dual boot Raspberry Pi or similar that > > reboots itself to the 'other' OS in the small hours, backs up the > > 'main' OS (which is the dnsmasq server) and then reboots back to the > > 'main' server. One then has a daily cloned image of the dnsmasq > > server which can be plugged into backup hardware if the server fails. > > > > > > Hi Chris, > > > This is a topic that has come up periodically over the years and I too have > watched with interest on how to best manage this. > > > I looked at using heartbeat and other failover service to handle any > potential failure. but it just becomes so complicated if you are using DHCP > too. If you do just DNS, then this is all much simpler. > > > Here is what I am doing now: > > 1) Run dnsmasq (pihole actually) in a docker container on my > "infrastructure" server. It has a static IP/MAC separate from the > infrastructure server. > > 2) Hourly, I rsync the docker data directory for pihole over to my desktop > machine. This contains the /etc/pihole directory, leases file, /etc/hosts > file, etc. It is a super tiny amount of data > > 3) On my desktop, I have docker installed and ready to go including the > pihole install. > > > Then, when I have a failure or want to do maintenance, I just stop the > pihole docker on the infrastructure server and start the pihole container on > the desktop. The service comes up with the same IP and MAC and the clients > never know it happened. When I am done, I just reverse the process. > > > It seems to work fine for my needs. > That sounds a good practical approach and would work for me I think.
I think I need to learn about docker. Is there a beginners guide anywhere that explains how to do something simple like I would want to do? The only other issue is that the only 'servers' I have on my system (apart from my desktop machine) are Pis, however I see no reason for not using one of them. -- Chris Green _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
