Slow transfer speeds (when running in docker swarm cluster)

Traefik Traefik v2 (latest)
1

Hi,

I've been labbing around with traefik for a few weeks now and got everything working perfectly fine, aside from one last quirk!

The problem is that when I run traefik in HA (mode: global or replicated) and when traefik is taking requests on host01 and the container it's loadbalancing to lives on e.g. host02, I get capped DL/UL speeds to ~3mbit/s.

It works as expected in case I move the container to the host that traefik is currently taking requests on, but it obviosuly isn't HA if I manually have to move around containers like that...

I bet this is something quite easy to fix if you understand the problem and something obvious I'm missing and would appreciate to get pointed in the right direction. If there's any tests I can do do make it easier to help me, please let me know.

traefik.yml:

version: '3.3'

services:

  traefik:
    image: traefik:v2.2
    ports:
      - target: 80
        published: 80
        protocol: tcp
        mode: host
      - target: 443
        published: 443
        protocol: tcp
        mode: host
    deploy:
      mode: global
      placement:
        constraints:
          - node.role == manager
      update_config:
        parallelism: 1
        delay: 10s
      restart_policy:
        condition: on-failure
      labels:
        - traefik.enable=true
        - traefik.docker.network=traefik-public
        - traefik.constraint-label=traefik-public
        - traefik.http.routers.traefik-public-http.rule=Host(`traefik.example.com`)
        - traefik.http.routers.traefik-public-http.entrypoints=http
        - traefik.http.routers.traefik-public-http.middlewares=httpsRedirect@file
        - traefik.http.routers.traefik-public-https.middlewares=sslHeaders@file, localNetworkOnly@file
        - traefik.http.routers.traefik-public-https.rule=Host(`traefik.example.com`)
        - traefik.http.routers.traefik-public-https.entrypoints=https
        - traefik.http.routers.traefik-public-https.tls=true
        - traefik.http.routers.traefik-public-https.service=api@internal
        - traefik.http.routers.traefik-public-https.tls.certresolver=le
        - traefik.http.services.traefik-public.loadbalancer.server.port=8080
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - /var/data/traefik/traefik-public-certificates:/certificates
      - /var/data/traefik/dynamic/dynamic.yml:/etc/traefik/dynamic/dynamic.yml
    command:
      - --providers.docker
      - --providers.docker.watch
      - --providers.docker.exposedbydefault=false
      - --providers.docker.swarmmode
      - --providers.file.filename=/etc/traefik/dynamic/dynamic.yml
      - --providers.file.watch=true
      - --entrypoints.http.address=:80
      - --entrypoints.https.address=:443
      - --certificatesresolvers.le.acme.email=my@email.com
      - --certificatesresolvers.le.acme.storage=/certificates/acme.json
      - --certificatesresolvers.le.acme.tlschallenge=true
      # Use Let's Encrypt Staging Server (dry-run) to avoid getting rate limited
      #- --certificatesresolvers.le.acme.caserver=https://acme-staging-v02.api.letsencrypt.org/directory
      - --accesslog
      - --log
      - --api
      #- --log.level=DEBUG
    networks:
      - traefik-public

volumes:
  traefik-public-certificates:

networks:
  traefik-public:
    attachable: true
    external: true

Dynamic.yml

serversTransport:
  forwardingTimeouts:
    dialTimeout: 120s
    responseHeaderTimeout: 0s
    idleConnTimeout: 300s

tls:
  options:
    default:
      cipherSuites:
        - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
        - TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
        - TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
        - TLS_AES_128_GCM_SHA256
        - TLS_AES_256_GCM_SHA384
        - TLS_CHACHA20_POLY1305_SHA256
      curvePreferences:
        - CurveP521
        - CurveP384
      minVersion: VersionTLS12
      sniStrict: true

http:
  middlewares:
    sslHeaders:
      headers:
        browserXssFilter: true
        contentTypeNosniff: true
        frameDeny: true
        sslRedirect: true
        stsIncludeSubdomains: true
        stsPreload: true
        stsSeconds: 15768000
    sslHeadersXframeAllow:
      headers:
        browserXssFilter: true
        contentTypeNosniff: true
        frameDeny: false
        sslRedirect: true
        stsIncludeSubdomains: true
        stsPreload: true
        stsSeconds: 15768000
    httpsRedirect:
      redirectScheme:
        scheme: https
        pemanent: true
    localNetworkOnly:
      ipWhiteList:
        sourceRange:
          - 10.0.0.0/16