traefik-swarm

Use traefik reverse proxy with docker swarm, based on this blog post: https://dockerswarm.rocks/traefik/

• docker service name is traefik
• overlay network name is traefik-public
• uses docker "host mode" to get real ip addresses and enable ipv6 ingress
• configured to run on single node in swarm based on constraints
• predefined middlewares for http, https and redirects from non-www to www

Setup instructions

Add the following environment variables or use a shell script for that.

Create docker overlay network

docker network create --driver=overlay --attachable traefik-public

Export current Node Id to ensure that traefik runs always on same node

export NODE_ID=$(docker info -f '{{.Swarm.NodeID}}')

Create tag on node to add constraint for deployment

docker node update --label-add traefik-public.traefik-public-certificates=true $NODE_ID

Create Email for letsencrypt notifications

export [email protected]

Domain for traefik UI

export DOMAIN=my.domain.com

Basic Auth User for Traefik

export USERNAME=MY_USER \
export PASSWORD=MY_SECURE_PASSWORD

Hash Password

export HASHED_PASSWORD=$(openssl passwd -apr1 $PASSWORD)

Deploy Stack:

docker stack deploy -c docker-compose.yml traefik

Access Logs & Rotation

The example has access log enabled and will log all traefik to a mounted host directory, log rotation on the host system rotates the logs periodically.

• Create directory, e.g. /var/log/traefik and mount it in traefik docker-compose file

    volumes:
      ...
      # Mount log folder
      - /var/log/traefik:/var/log/traefik

• Add log rotation on Host System - example for Ubuntu

nano /etc/logrotate.d/traefik

# assuming traefik container contains "traefik" in its name
/var/log/traefik/*.log {
        daily
        missingok
        rotate 30
        compress
        delaycompress
        notifempty
        create 0644 root root
        sharedscripts
        postrotate
           # kill & resstart container which contains "traefik" in name
           docker kill --signal="USR1" $(docker ps | grep traefik | awk '{print $1}')
        endscript
}

# debug logrotate & run it
logrotate /etc/logrotate.conf --debug 
logrotate /etc/logrotate.conf