Localhost not found even if my docker containers are up? - ruby-on-rails

Question

I am relatively new to dev in general, to the Docker universe and to Rails in particular, apologize in advance if it sounds like a silly question.
I am trying to run an application in a monorepo composed of 4 services (2 websites and 2 APIs) + Postgresql, with the help of Docker Compose. The final goal is to run it on a VPS with Traefik (once I get the current app to work locally).
Here are the different services :
Postgres (through the Postgres image available in Dockerhub)
a B2C website (NextJS)
an admin website (React with create Vite)
an API (Rails). It should be linked to the Postgres database
a Strapi API (for the content of the B2C website). Strapi has its own SQLite database. Only the B2C website requires the data coming from Strapi.
When I run the docker compose up -d command, it seems to be working (see pic below)
but when I go to one of the websites (except for the Strapi that seems to be correctly working) (https://localhost:3009, or 3008 or 3001), I get nothing (see below).
However, I don't see any error in the logs of any apps. For instance the Rails API logs below:
I assume that I have mistakes in my config, especially in the database.yml config of the Rails api and the docker-compose.yml file.
database.yml :
default: &default
adapter: postgresql
encoding: unicode
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
host: pg
development:
<<: *default
database: chana_api_v2_development
test:
<<: *default
database: chana_api_v2_test
production:
<<: *default
database: chana_api_v2_production
username: chana
password: <%= ENV["CHANA_DATABASE_PASSWORD"] %>
docker-compose.yml
version: '3'
services:
# ----------------POSTGRES -----------------
pg:
image: postgres:14.6
container_name: pg
networks:
- chana_postgres_network
ports:
- "5432:5432"
environment:
POSTGRES_DB: chana_development
POSTGRES_USER: chana
POSTGRES_PASSWORD: chana
volumes:
- ./data:/var/lib/postgresql/data
# ----------------- RAILS API -----------------
api:
build: ./api
container_name: api
networks:
- chana_postgres_network
- api_network
volumes:
- ./api:/chana_api
ports:
- "3001:3000"
depends_on:
- pg
# ----------------- STRAPI -----------------
strapi:
build:
context: ./strapi
args:
BASE_VERSION: latest
STRAPI_VERSION: 4.5.0
container_name: chana-strapi
restart: unless-stopped
env_file: .env
environment:
NODE_ENV: ${NODE_ENV}
HOST: ${HOST}
PORT: ${PORT}
volumes:
- ./strapi:/srv/app
- strapi_node_modules:/srv/app/node_modules
ports:
- "1337:1337"
# ----------------- B2C website -----------------
public-front:
build: ./public-front
container_name: public-front
restart: always
command: yarn dev
ports:
- "3009:3000"
networks:
- api_network
- chana_postgres_network
depends_on:
- api
- strapi
volumes:
- ./public-front:/app
- /app/node_modules
- /app/.next
# ----------------- ADMIN website -----------------
admin-front:
build: ./admin-front
container_name: admin-front
restart: always
command: yarn dev
ports:
- "3008:3000"
networks:
- api_network
- chana_postgres_network
depends_on:
- api
volumes:
- ./admin-front:/app
- /app/node_modules
- /app/.next
volumes:
strapi_node_modules:
networks:
api_network:
chana_postgres_network:
Do you have any idea why I cannot see anything on the website pages?
I tried to change the code of the different files that are relevant, especially database.yml, docker-compose.yml, and the dockerfiles of each app.
Also, I tried to look into the api container (Rails) with the command docker exec -it api /bin/sh to check the database through the Rails console, and I get this error message:
activeRecord::ConnectionNotEstablished could not connect to server: No such file or directory. Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

Answer 1

instead of localhost press ctrl and click on the url that it passes sometimes does not open on the localhost port of your website

Answer 2

looks like your host in docker is 127.0.0.1:3000 normally this is fine but in docker when you want to expose the app to your host machine you need to change the app to run on 0.0.0.0:3000 and then docker will be able to pass the app through to your host machine. Without specific Dockerfiles this is the best I can do. I have run into this issue with strapi and some other apps before so hopefully it helps.
It will still be localhost:3000 on the host machine if i wasn't clear.