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traefik/docs/content/user-guides/docker-compose/acme-http/index.md
Ludovic Fernandez beec65938e
Improve documentation.
2020-02-17 11:04:04 +01:00

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Docker-compose with let's encrypt : HTTP Challenge

This guide aim to demonstrate how to create a certificate with the let's encrypt HTTP challenge to use https on a simple service exposed with Traefik.
Please also read the basic example for details on how to expose such a service.

Prerequisite

For the HTTP challenge you will need:

  • A publicly accessible host allowing connections on port 80 & 443 with docker & docker-compose installed.
  • A DNS record with the domain you want to expose pointing to this host.

Setup

  • Create a docker-compose.yml on your remote server with the following content:
--8<-- "content/user-guides/docker-compose/acme-http/docker-compose.yml"

  • Replace postmaster@mydomain.com by your own email within the certificatesresolvers.myresolver.acme.email command line argument of the traefik service.

  • Replace whoami.mydomain.com by your own domain within the traefik.http.routers.whoami.rule label of the whoami service.

  • Optionally uncomment the following lines if you want to test/debug:

    #- "--log.level=DEBUG"
#- "--certificatesresolvers.myresolver.acme.caserver=https://acme-staging-v02.api.letsencrypt.org/directory"

  • Run docker-compose up -d within the folder where you created the previous file.

  • Wait a bit and visit https://your_own_domain to confirm everything went fine.

!!! Note

If you uncommented the `acme.caserver` line, you will get an SSL error, but if you display the certificate and see it was emitted by `Fake LE Intermediate X1` then it means all is good.
(It is the staging environment intermediate certificate used by let's encrypt).

You can now safely comment the acme.caserver line, remove the letsencrypt/acme.json file and restart Traefik to issue a valid certificate.

Explanation

What changed between the basic example:

  • We configure a second entry point for the HTTPS traffic:
command:
  # Traefik will listen to incoming request on the port 443 (https)
  - "--entrypoints.websecure.address=:443"
ports:
  - "443:443"
  • We configure the HTTPS let's encrypt challenge:
command:
  # Enable a http challenge named "myresolver"
  - "--certificatesresolvers.myresolver.acme.httpchallenge=true"
  # Tell it to use our predefined entrypoint named "web"
  - "--certificatesresolvers.myresolver.acme.httpchallenge.entrypoint=web"
  # The email to provide to let's encrypt
  - "--certificatesresolvers.myresolver.acme.email=postmaster@mydomain.com"
  • We add a volume to store our certificates:
volumes:
  # Create a letsencrypt dir within the folder where the docker-compose file is
  - "./letsencrypt:/letsencrypt"

command:
  # Tell to store the certificate on a path under our volume
  - "--certificatesresolvers.myresolver.acme.storage=/letsencrypt/acme.json"
  • We configure the whoami service to tell Traefik to use the certificate resolver named myresolver we just configured:
labels:
  # Uses the Host rule to define which certificate to issue
  - "traefik.http.routers.whoami.tls.certresolver=myresolver"