IIRC there’s a couple different ways with Caddy to replicate the letsencrypt config between instances, but I never quite got that working. I didn’t find a ton of value in a HA reverse proxy config anyways since almost all of my services are running on the same machine, and usually the proxy is offline because that machine is offline. The more important thing was HA DNS, and I got that working pretty well with keepalived. The redundant DNS server just runs on a $100 mini PC. Works well enough for me.
IIRC there’s a couple different ways with Caddy to replicate the letsencrypt config between instances, but I never quite got that working. I didn’t find a ton of value in a HA reverse proxy config anyways since almost all of my services are running on the same machine, and usually the proxy is offline because that machine is offline. The more important thing was HA DNS, and I got that working pretty well with keepalived. The redundant DNS server just runs on a $100 mini PC. Works well enough for me.