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dump the Lets Encrypt certs that Traefik stores in acme.json - to .crt, .key and .pem

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traefik-certdumper

Dump the Lets Encrypt certs that Traefik stores in acme.json or in Consul - to .crt, .key and .pem.

Pretty much to solve traefik/traefik#2418 using @flesser's compose-file script and https://github.com/containous/traefik/blob/master/contrib/scripts/dumpcerts.sh with a few little mods.

Default mode: acme.json

This is the default mode. In this case, you just have to mount acme.json on /traefik/acme.json. The certs will be dumped to /traefik/ssl.

Here is a Docker Swarm stack configuration example:

  # Watch acme.json and dump certificates to files
  # https://github.com/containous/traefik/issues/2418#issuecomment-369225856
  certdumper:
    image: svendowideit/traefik-certdumper:latest
    volumes:
      - traefikdata:/traefik
    deploy:
      mode: replicated
      replicas: 1

Consul mode

When you run multiple Traefik instances, it usually uses a KV store to store Lets Encrypt certs, instead of acme.json. Consul is currently the recommanded KV store.

To enable this mode, you have to:

  • set the environment variable CERTDUMPER_MODE to consul
  • set the environment variable CONSUL_HTTP_ADDR (host:port)
  • override the environment variable CERTDUMPER_CONSUL_PREFIX if needed (defaults to traefik)

Here is a Docker Swarm stack configuration example:

  # Watch acme configuration from Consul and dump certificates to files
  certdumper:
    image: svendowideit/traefik-certdumper:latest
    environment:
      - CERTDUMPER_MODE=consul
      - CERTDUMPER_CONSUL_ADDR=traefik_consul:8500
    volumes:
      - traefikcerts:/traefik/ssl
    networks:
      - traefik
    deploy:
      mode: replicated
      replicas: 1
      restart_policy:
        condition: on-failure
        delay: 60s

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dump the Lets Encrypt certs that Traefik stores in acme.json - to .crt, .key and .pem

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