How to map specific port inside docker container when using traefik?

PathPrefix:/blog

When you have this as a routing rule, traefix won't automatically remove the prefix when sending to the container.

So unless you have a route /blog inside your container you will get a 404.

So what you normally do is also add a middleware to strip this ->https://docs.traefik.io/middlewares/stripprefix/

Also you appear not to be setting your rules based on your service.

So as an example for your first service blog,

try->

labels:    - "traefik.http.routers.blog.rule=Host(`localhost`) && PathPrefix(`/blog`)"    - "traefik.http.routers.blog.middlewares=strip-blog"    - "traefik.http.middlewares.strip-blog.stripprefix.prefixes=/blog"

And then do the same for your other routes, don't forget to replace routers.blog with routers.docs etc..

Thanks to @Keith I found the solution

version: '3'services:  website:    build: ./website    expose: [3000]    networks: # It's essential to specify the same network in every service      - webgateway    labels:      - "traefik.http.routers.website.rule=Host(`localhost`)" # Use the right format      - "traefik.port=3000" # Let traefik find the right port  blog:    build: ./blog    expose: [4000]    networks:      - webgateway    labels:      - "traefik.http.routers.blog.rule=Host(`localhost`) && PathPrefix(`/blog`)" # blog has a root as `/blog` so no need to strip otherwise too many redirects      - "traefik.port=4000"  docs:    build: ./docs    expose: [3000]    networks:      - webgateway    labels:      - "traefik.http.routers.docs.rule=Host(`localhost`) && PathPrefix(`/docs`)"      - "traefik.http.routers.docs.middlewares=strip-docs" # Necessary as Keith mentioned      - "traefik.http.middlewares.strip-docs.stripprefix.prefixes=/docs"      - "traefik.port=3000"  proxy:    image: traefik    command: --api.insecure=true --providers.docker    networks:      - webgateway    ports:      - "80:80"      - "8080:8080"    volumes:      - /var/run/docker.sock:/var/run/docker.socknetworks:  webgateway:    driver: bridge

labels: - traefik.http.services.<YOUR-SERVICE-NAME>.loadbalancer.server.port=9763

EG:

services:  wso:    image: "my-custom-wso-image"    volumes:      - .....    labels:      - "traefik.enable=true"      - "traefik.http.routers.wso.tls=true"      - "traefik.http.routers.wso.rule=Host(`my.nice.url`)"      - "traefik.http.services.wso.loadbalancer.server.port=9763" #<-----