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Php versions – Docker Bridge Network TCP Restransmission

We have setup three docket containers

  1. PHP
  2. nginx
  3. FluentD

Docker is running on bridge network mode, we have find huge TCP retransmission (18%) from Docker.

Docker Version is: Docker version 18.09.0, build 4d60db4

Anyone facing similar issues or any work around ?

enter image description here

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2

Answers


  1. 0

    Same workaround mentioned by “solvease”(Feb 5 at 8:58) > use ‘–network host’ or ‘network_mode: “host”‘ for docker-compose definition.

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  2. 0

    We have had a similar issue when instance network MTU was 1450 due to VXLAN usage but docker by default creates bridged network with MTU 1500.

    Configuring /etc/docker/daemon.json to be like:

    {
  "mtu": 1400
}

    And restarting docker fixed it for us.
    Usage of host network also works but it limits docket usage a lot.
    For docker-compose use network and define MTU as well, e.g.

    version: '2'
services:
  redis:
    restart: always
    image: 'redis:alpine'
    command: redis-server
    networks:
      - backend

networks:
    backend:
      driver: bridge
      driver_opts:
        com.docker.network.driver.mtu: 1400

    This behaviour describe here:
    https://mlohr.com/docker-mtu/ and here
    https://sylwit.medium.com/how-we-spent-a-full-day-figuring-out-a-mtu-issue-with-docker-4d81fdfe2caf

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