Add loadbalancing to multiple containers/replicas about caddy-docker-proxy HOT 7 CLOSED

Hey @jtyr
I'm implementing it slightly different, by merging directive objects instead of manipulating strings.
I'm creating a PR.

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Additional question... Works the plugin with multi node / host swarm setups or just single / locale host?

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Hi @lucaslorentz,
any plans to implement load balancing by container ip addresses?

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Hi!
I am also quite interested in having this. Since it would make it possible to scale up the backend containers and adding it to load balancing in caddy on the fly.

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Hey @jcmeier
We already supports multiple backend containers with scale up and down. You just need to add labels to a swarm service.
Caddy will then proxy to swarm service VIP, and swarm service will load balance to all containers.

This issue is to add the same capabilities without swarm services.

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Thanks for clearing this up @lucaslorentz!

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I have put together a hacky solution for loadbalancing containers in a service. It only works if the labels are defined on the service level:

version: "3"
services:
  frontend:
    image: mycaddy
    ports:
      - 443:443
  backend:
    image: mycaddy
    labels:
      caddy.address: https://example.com
      caddy.targetport: 80
      caddy.proxy.keepalive: 0
    deploy:
      replicas: 2

It would be more difficult to make it working if labels are defined under the deploy section. It would require to search for nodes where service tasks are running and then search for containers on those nodes which have swarm label with the service name (am I right @lucaslorentz?). Please test it and let me know whether it works for you and if yes, I will create a PR for this feature.

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