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Traefik 2 : Contribution and Debug

David YOTEAU
Software craftman. Ruby jedi master. Crystal padawan.
・2 min read

Traefik 2 : Contribution and Debug

This article is a follow-up to this one: https://dev.to/jadekharats/traefik-2-concept-3elj

The need

We need to add other services to our Traefik but especially to understand how it works to learn.

Debugging and logging

Everything will be done in the static configuration. Besides, I give you the link to the official documentation of the static configuration by file: https://docs.traefik.io/v2.0/reference/static-configuration/file/

Log activation

In the traefik.yaml file we will add this block

log:
  filePath: "log/traefik.log"
  level: WARN

The WARN level is enough for my taste to understand the creations and configurations of Traefik 2 elements.

We will also add access.log that we find for any reverse proxy

AccessLog:
  filePath: "log/access.log"
  bufferingSize: 100

Activate the debug mode of the API

To have the API actions in the log/traefik.log log file, modify the api block as follows

api:
  dashboard: true
  debug: true

Recovery of logs outside the container

We want to get the logs out of the container. For that, nothing more simple, it is enough to declare the volume in the file stack-traefik.yml

services:
  traefik:
    volumes:
      - /swarm/traefik2/log:/log

Update and anonymous contribution.

Traefik 2 is in Release Candidate version. It is therefore necessary to keep up to date and at the same time, allow Traefik to send anonymous data to the maintainers to help them develop the RC.
Again, it's in the traefik.yaml that it's happening.

global:
  checkNewVersion: true
  sendAnonymousUsage: true

Conclusion.

Here we are ready for adding TLS and certificate generation.

As for the previous article, I put back, the state of the files at this stage.

traefik.yaml

global:
  checkNewVersion: true
  sendAnonymousUsage: true
api:
  dashboard: true
  debug: true
entrypoints:
  ssh:
    address: ":22"
  http:
    address: ":80"
  https:
    address: ":443"
providers:
  docker:
    watch: true
    swarmMode: true
    useBindPortIP: true
    endpoint: "unix:///var/run/docker.sock"
log:
  filePath: "log/traefik.log"
  level: WARN
AccessLog:
  filePath: "log/access.log"
  bufferingSize: 100

stack-traefik.yml

version: "3.3"

Link:
  traefik-net:
    external: true

configs:
  traefik.yaml:
    file: ./traefik.yaml


services:
  traefik:
    image: traefik:v2.0
    ports:
      - 80:80
      - 443:443
      - 22:22
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - /swarm/traefik2/log:/log
    configs:
      - source: traefik.yaml
        target: /etc/traefik/traefik.yaml

    Link:
      - traefik-net
    deploy:
      fashion: global
      placement:
        constraints: [node.role == manager]
      labels:
        - "traefik.docker.network=traefik-net"
        - "traefik.http.routers.traefik-router0.entrypoints=http"
        - "traefik.http.routers.traefik-router0.rule=Host(`traefik.example.tld`)"
        - "traefik.http.routers.traefik-router0.middlewares=auth"
        - "traefik.http.middlewares.auth.basicauth.users=jade:$$2y$$..."
        - "traefik.http.services.traefik-service.loadbalancer.server.port=8080"

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