HA with etcd backed certs in swarm

Traefik Traefik v3 (latest)
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At least the Traefik website (link) states distributed LetsEncrypt only works with Traefik EE. Devs somehow got to be paid.

You can use up to 5 servers in Swarm with dnsChallenge for individual TLS certs.

Or use LE outside of Traefik and load the certs, like post, post.

With k8s cert-manager, the distributed LetsEncrypt works with open-source Traefik.