Docker container can't call localhost inside container itself - php

Question

I have a docker-compose environment setup.
But inside service "Lumen" im trying to make a CURL request to the service itself.
However, the container can't access itself from localhost:8000 OR lumen:8000??
When I call lumen:8000 from the service it just never returns a response and just keeps loading ( And the curl request is to a different url so no infinite loop )
In my Laravel controller I found the protocal, host and port to be: http://lumen:8000
I seems like Laravel can't connect to itself, which I really need for my project.
I can connect to the Laravel from my own computer through localhost, but I need the Laravel to call it self.
Error message from Laravel controller after doing a CURL request:
Failed to connect to localhost port 8000 after 0 ms: Connection refused
Changing host to "lumen" just makes the request load infinite. No matter what page I try to connect to.
Docker-compose file:
version: "3.5"
services:
lumen:
expose:
- "8000"
ports:
- "8000:8000"
volumes:
- ./server:/var/www/html
- ./server/vendor:/var/www/html/vendor/
build:
context: server
dockerfile: Dockerfile
command: php -S lumen:8000 -t public
restart: always
privileged: true
depends_on:
- database
networks:
- database
frontend:
build:
context: client
dockerfile: Dockerfile
volumes:
- ./client/src:/app/src
ports:
- 3000:3000
stdin_open: true
#restart: always
networks:
- database
# Database Service (Mysql)
database:
image: mysql:latest
container_name: blogmoda_mysql
environment:
MYSQL_DATABASE: blogmoda-app
MYSQL_USER: root
MYSQL_PASSWORD: root
MYSQL_ROOT_PASSWORD: root
command: ['--character-set-server=utf8mb4', '--collation-server=utf8mb4_unicode_ci','--default-authentication-plugin=mysql_native_password']
ports:
- "127.0.0.1:3306:3306"
volumes:
- db-data:/var/lib/mysql
networks:
- database
phpmyadmin:
image: phpmyadmin/phpmyadmin
container_name: dev_phpmyadmin
links:
- database
environment:
PMA_HOST: database
PMA_PORT: 3306
PMA_ARBITRARY: 1
restart: always
depends_on:
- database
ports:
- 9001:80
networks:
- database
volumes:
db-data:
# Networks to be created to facilitate communication between containers
networks:
database:
Server dockerfile:
FROM php:8.1-fpm-alpine
RUN apk update && apk add bash
RUN apk add chromium
RUN apk add --no-cache zip libzip-dev
RUN docker-php-ext-configure zip
RUN docker-php-ext-install zip
RUN docker-php-ext-install pdo pdo_mysql
RUN docker-php-ext-install pdo_mysql
RUN docker-php-ext-install opcache
WORKDIR /var/www/html/
RUN php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/bin/ --filename=composer
COPY . .
RUN composer install --ignore-platform-req=ext-zip --ignore-platform-reqs

Answer 1

I believe localhost should work. Assuming curl is installed in lumen, in your compose file under the lumen service can you try changing your command
command: php -S lumen:8000 -t public
to a direct curl via bash as
command: sh -c "curl -s localhost:8000"
Then check the logs of the lumen container to see whether or not the curl ran successfully.

Answer 2

Try 0.0.0.0:8000 instead localhost:8000. It works for localhost too