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I run multiple pinholes using keepalived. Then I only use one DNS in my DHCP server. Second pihole will seemlessly take over if the first one goes down whilst using the original DNS address.
Work quite well. I had to learn the hard way that only using a single pihole was just asking for my partner to be mad when it didn't work / when I was doing server maintenance. Now I have multiple and they can all seemlessly take over if any my server nodes are down
How do you manage automatically transferring the ip of the main rpi to the backup rpi when the first disappears?
Keepalived
clone the Mac address
Don't you then run into MAC conflicts?
How do you keep both on the network?
oh. fuck.
Arduino? lol
I'm just spit balling here: backup pi pings munute-ly main pi. if main pi is down 2 pings, it resets Mac and reboots network interface.
Then when the main PI returns it creates a conflict...
oh hm...
hmmm
ok. both pis know the live IP and the backup IP, and have the same config: cold boot into backup I and ping live ip
Keepalived is the way. Gravity sync keeps everything in line. Works like a charm. I migrated yesterday from wifi to wired and cannot be happier. As a bonus did not need to reconfigure pivpn.