Rancher simulate DB network fail

docker-compose.yml

version: '2'

services:
  db:
    image: mariadb:5.5
    command: --character-set-server=utf8 --collation-server=utf8_general_ci
    environment:
      - MYSQL_ROOT_PASSWORD=root
      - MYSQL_DATABASE=cattle

  pumba:
    image: gaiaadm/pumba
    command: pumba netem --interface eth0 --duration 3m delay --time 3000 rancherdelay_db_1
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    depends_on:
      - "db"

  rancherserver:
     image: rancher/server:v1.6.2
     command: --db-host db --db-port 3306 --db-user cattle --db-pass cattle --db-name cattle