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docker compose reverse port map without using Host network driver (--net=host) (self.selfhosted)

submitted 4 months ago* (last edited 4 months ago) by Deemo to c/selfhosted@lemmy.world

9 comments fedilink hide all child comments

Hi guys quick question say you run a a application on your localhost (example lets say couchdb runing directly on localhost:3434 not in docker).

Now you have a docker container (say caddy, ngnix, etc). Is there a way to allow docker container to acess localhost:3434 WITHOUT using the Host network driver (--net=host)

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[–] morethanevil@lemmy.fedifriends.social 8 points 4 months ago* (last edited 4 months ago) (1 children)

Add this to the service in your docker-compose.yml

  extra_hosts:
     - host.docker.internal:host-gateway

Example:

services:
    redis:
    restart: always
    container_name: redis
    image: redis:7.2-alpine
    extra_hosts:
      - host.docker.internal:host-gateway

Then you can reach your host from inside the container via host.docker.internal:3434

host.docker.internal is like your "localhost" on the host. It is a special DNS name.

[–] Deemo 2 points 4 months ago

Thanks for the tip