traefik not respecting frontend rule - docker

Question

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.

Answer 1

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