Laravel Sail bridge network does not allow connections between containers

If I understand correctly you have 2 different repos with Laravel Sail and you want these 2 services to be in the same Docker network, right? If yes, then I tried to implement that few days ago and this is what I ended with.

Let's assume that we have 2 applications: one exposes REST API and second is consumer (client).

API:

docker-compose.yml

# For more information: https://laravel.com/docs/sail
version: '3'
services:
    api.local:
        build:
            context: ./vendor/laravel/sail/runtimes/8.1
            dockerfile: Dockerfile
            args:
                WWWGROUP: '${WWWGROUP}'
        image: sail-8.1/app
        extra_hosts:
            - 'host.docker.internal:host-gateway'
        ports:
            - '${APP_PORT:-80}:80'
        environment:
            WWWUSER: '${WWWUSER}'
            LARAVEL_SAIL: 1
            XDEBUG_MODE: '${SAIL_XDEBUG_MODE:-off}'
            XDEBUG_CONFIG: '${SAIL_XDEBUG_CONFIG:-client_host=host.docker.internal}'
        volumes:
            - '.:/var/www/html'
        networks:
            - my-network
        depends_on:
            - pgsql
            - redis
    pgsql:
        image: 'postgres:13'
        ports:
            - '${FORWARD_DB_PORT:-5432}:5432'
        environment:
            PGPASSWORD: '${DB_PASSWORD:-secret}'
            POSTGRES_DB: '${DB_DATABASE}'
            POSTGRES_USER: '${DB_USERNAME}'
            POSTGRES_PASSWORD: '${DB_PASSWORD:-secret}'
        volumes:
            - 'sailpgsql:/var/lib/postgresql/data'
        networks:
            - my-network
        healthcheck:
            test: ["CMD", "pg_isready", "-q", "-d", "${DB_DATABASE}", "-U", "${DB_USERNAME}"]
            retries: 3
            timeout: 5s
    redis:
        image: 'redis:alpine'
        ports:
            - '${FORWARD_REDIS_PORT:-6379}:6379'
        volumes:
            - 'sailredis:/data'
        networks:
            - my-network
        healthcheck:
            test: ["CMD", "redis-cli", "ping"]
            retries: 3
            timeout: 5s
    mailhog:
        image: 'mailhog/mailhog:latest'
        ports:
            - '${FORWARD_MAILHOG_PORT:-1025}:1025'
            - '${FORWARD_MAILHOG_DASHBOARD_PORT:-8025}:8025'
        networks:
            - my-network
networks:
    my-network:
        name: my-network
        driver: bridge
volumes:
    sailpgsql:
        driver: local
    sailredis:
        driver: local

.env

# add this line, it should be the same as your service name in docker-compose.yml
APP_SERVICE=api.local

Client:

docker-compose.yml

# For more information: https://laravel.com/docs/sail
version: '3'
services:
    client.local:
        build:
            context: ./vendor/laravel/sail/runtimes/8.1
            dockerfile: Dockerfile
            args:
                WWWGROUP: '${WWWGROUP}'
        image: sail-8.1/app
        extra_hosts:
            - 'host.docker.internal:host-gateway'
        ports:
            - '${APP_PORT:-80}:80'
        environment:
            WWWUSER: '${WWWUSER}'
            LARAVEL_SAIL: 1
            XDEBUG_MODE: '${SAIL_XDEBUG_MODE:-off}'
            XDEBUG_CONFIG: '${SAIL_XDEBUG_CONFIG:-client_host=host.docker.internal}'
        volumes:
            - '.:/var/www/html'
        networks:
            - proxy
networks:
    proxy:
        external:
            name: my-network

.env

# add this line, it should be the same as your service name in docker-compose.yml
APP_SERVICE=client.local

And now the most important tip. You can't use http://localhost:3000 inside containers, because I assume that port 3000 is exposed outside containers. If you want to access API endpoint from client app you should call services by their names, e.g.

In client app

Route::get('/formulas', function() {
    $endpoint = 'api.local' . '/api/formulas/all'; // api.local is going to be translated to appropriate URL by Docker, it's the same as service name in docker-compose.yml in API
    return Http::withOptions([
        'debug' => false,
    ])->get($endpoint);
});

With our Docker environment, to communicate with the machines in the internal network, we reference them by their name. For example, in our env file, our mysql host is mysql as that's the name of the machine in docker. Maybe as they are communicating internally, you need to make a request to:

http://formulas/api/formulas/all

Also, worth noting, although we have port forwards, so we can connect to our contains from our windows machines, the machines communicate internally on their internal ports. For example, we have Two MYSQL containers, one binds externally to 3307 and the other to 3306, but both bind interally to 3306, but when we use them in the network, we access them on their internal port, so both 3306.

Hope that helps!