Myujth

I am trying to deploy multiple apps on my docker host and have traefik route traffic based on hostnames to the different apps

I am using docker-compose for all my docker containers

Here is my traeffik.yaml file

version: '3.5'

services:
 traefik:
 image: traefik
 container_name: traefik
 command: --api --docker
 networks:
 - traefik_network
 ports:
 - "80:80"
 - "8080:8080"
 volumes:
 - /var/run/docker.sock:/var/run/docker.sock

networks:
 traefik_network:
 name: traefik_network

here is my wpapp1.yaml file

version: '3.5'

services:
 mysql:
 image: mysql:5.7
 volumes:
 - wpapp1_mysql:/var/lib/mysql
 restart: always
 container_name: wpapp1_mysql
 networks:
 - traefik_network
 environment:
 MYSQL_ROOT_PASSWORD: wpapp1
 MYSQL_DATABASE: wpapp1
 MYSQL_USER: wpapp1
 MYSQL_PASSWORD: wpapp1
 wordpress:
 depends_on:
 - mysql
 image: wordpress:latest
 volumes:
 - wpapp1_wordpress:/var/www/html
 restart: always
 container_name: wpapp1_wordpress
 networks:
 - traefik_network
 labels:
 - "traefik.frontend.rule=Host:wpapp1.example.com"
 - "traefik.port=80"
 - "traefik.docker.network=traefik_network"
 environment:
 WORDPRESS_DB_HOST: mysql:3306
 WORDPRESS_DB_USER: wpapp1
 WORDPRESS_DB_PASSWORD: wpapp1
volumes:
 wpapp1_mysql:
 name: wpapp1_mysql
 wpapp1_wordpress:
 name: wpapp1_wordpress
networks:
 traefik_network:
 external:
 name: traefik_network

and here is my wpapp2.yaml file

version: '3.5'

services:
 mysql:
 image: mysql:5.7
 volumes:
 - wpapp2_mysql:/var/lib/mysql
 restart: always
 container_name: wpapp2_mysql
 networks:
 - traefik_network
 environment:
 MYSQL_ROOT_PASSWORD: wpapp2
 MYSQL_DATABASE: wpapp2
 MYSQL_USER: wpapp2
 MYSQL_PASSWORD: wpapp2
 wordpress:
 depends_on:
 - mysql
 image: wordpress:latest
 volumes:
 - wpapp2_wordpress:/var/www/html
 restart: always
 container_name: wpapp2_wordpress
 networks:
 - traefik_network
 labels:
 - "traefik.frontend.rule=Host:wpapp2.example.com"
 - "traefik.port=80"
 - "traefik.docker.network=traefik_network"
 environment:
 WORDPRESS_DB_HOST: mysql:3306
 WORDPRESS_DB_USER: wpapp2
 WORDPRESS_DB_PASSWORD: wpapp2
volumes:
 wpapp2_mysql:
 name: wpapp2_mysql
 wpapp2_wordpress:
 name: wpapp2_wordpress
networks:
 traefik_network:
 external:
 name: traefik_network

So now i expect traefik to route based on the hostnames wpapp1.example.com and wpapp2.example.com BUT traefik is loadbalancing traffic!!!

So when i go to http:/wpapp1.example.com, traefik is loadbalancing it between the two apps and same for the other hostnames. Now sure what is going on here since i specifically add the traefik.frontend.rule

I mean how in the hell is that happening?
I have spent hours to figure what is going on and before i go insane i decided to some here to get some help on what is going on here.

Put your database on a different network. Otherwise WordPress will RR load balance to the two mysql instances in the same docker network (that's the expected behavior when you have two containers with the same alias on the same network). You can do that with the default network:

version: '3.5'

services:
 mysql:
 image: mysql:5.7
 volumes:
 - mysql:/var/lib/mysql
 restart: unless-stopped
 networks:
 - db
 environment:
 MYSQL_ROOT_PASSWORD: wpapp
 MYSQL_DATABASE: wpapp
 MYSQL_USER: wpapp
 MYSQL_PASSWORD: wpapp
 wordpress:
 depends_on:
 - mysql
 image: wordpress:latest
 volumes:
 - wordpress:/var/www/html
 restart: unless-stopped
 networks:
 - traefik
 - db
 labels:
 - "traefik.frontend.rule=Host:wpapp1.example.com"
 - "traefik.port=80"
 - "traefik.docker.network=traefik_network"
 environment:
 WORDPRESS_DB_HOST: mysql:3306
 WORDPRESS_DB_USER: wpapp
 WORDPRESS_DB_PASSWORD: wpapp
volumes:
 mysql:
 wordpress:
networks:
 db:
 traefik:
 external:
 name: traefik_network