Docker. Communication between Laravel containers - laravel

Question

I have a project that I am trying to develop with a microservices approach. I prepared the APIs on two separate microservices and completed their tests. When I send a request from container A to container B, I get the error cURL error 7: Could not connect to localhost port 8100: Connection refused. After my research, I couldn't find a solution.
Request Architecture:
I'm trying to make a request from 127.0.0.1:8000 to an api address running at 127.0.0.1:8100.
What should I do to fix this problem? My question may be wrong, so I apologize in advance.
thanks
My Compose File First Container
# For more information: https://laravel.com/docs/sail
version: '3'
services:
laravel.test:
build:
context: ./docker/8.0
dockerfile: Dockerfile
args:
WWWGROUP: '${WWWGROUP}'
image: sail-8.0/app
container_name: MP-Main-Service-Laravel
extra_hosts:
- 'host.docker.internal:host-gateway'
ports:
- 8000:8000
environment:
WWWUSER: '${WWWUSER}'
LARAVEL_SAIL: 2
XDEBUG_MODE: '${SAIL_XDEBUG_MODE:-off}'
XDEBUG_CONFIG: '${SAIL_XDEBUG_CONFIG:-client_host=host.docker.internal}'
volumes:
- '.:/var/www/html'
networks:
- sail
depends_on:
- mysql
- redis
mysql:
image: 'mysql:8.0'
container_name: MP-Main-Service-MySql
ports:
- '${FORWARD_DB_PORT:-3306}:3306'
environment:
MYSQL_ROOT_USER: '${DB_USERNAME}'
MYSQL_ROOT_PASSWORD: '${DB_PASSWORD}'
MYSQL_DATABASE: '${DB_DATABASE}'
MYSQL_USER: '${DB_USERNAME}'
MYSQL_PASSWORD: '${DB_PASSWORD}'
MYSQL_ALLOW_EMPTY_PASSWORD: 'yes'
volumes:
- "/var/lib/mysql"
networks:
- sail
phpmyadmin:
image: 'phpmyadmin:latest'
container_name: MP-Main-Service-PhpMyAdmin
ports:
- 8081:80
environment:
PMA_HOST: mysql
MYSQL_ROOT_USER: '${DB_USERNAME}'
MYSQL_ROOT_PASSWORD: '${DB_PASSWORD}'
MYSQL_DATABASE: '${DB_DATABASE}'
depends_on:
- mysql
networks:
- sail
redis:
image: 'redis:alpine'
container_name: MP-Main-Service-Redis
ports:
- '${FORWARD_REDIS_PORT:-6379}:6379'
volumes:
- 'sailredis:/data'
networks:
- sail
healthcheck:
test: ["CMD", "redis-cli", "ping"]
retries: 3
timeout: 5s
networks:
sail:
driver: bridge
volumes:
sailmysql:
driver: local
sailredis:
driver: local
My Compose File Second Container
# For more information: https://laravel.com/docs/sail
version: '3'
services:
laravel.test:
build:
context: ./docker/8.0
dockerfile: Dockerfile
args:
WWWGROUP: '${WWWGROUP}'
image: sail-8.0/app
container_name: MP-Communication-Service-Laravel
extra_hosts:
- 'host.docker.internal:host-gateway'
ports:
- 8100:8000
environment:
WWWUSER: '${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:
- sail
depends_on:
- mysql
- redis
mysql:
image: 'mysql:8.0'
container_name: MP-Communication-Service-MySql
ports:
- '${FORWARD_DB_PORT:-33061}:33061'
environment:
MYSQL_ROOT_USER: '${DB_USERNAME}'
MYSQL_ROOT_PASSWORD: '${DB_PASSWORD}'
MYSQL_DATABASE: '${DB_DATABASE}'
MYSQL_USER: '${DB_USERNAME}'
MYSQL_PASSWORD: '${DB_PASSWORD}'
MYSQL_ALLOW_EMPTY_PASSWORD: 'yes'
volumes:
- "/var/lib/mysql"
networks:
- sail
phpmyadmin:
image: 'phpmyadmin:latest'
container_name: MP-Communication-Service-PhpMyAdmin
ports:
- 8082:80
environment:
PMA_HOST: mysql
MYSQL_ROOT_USER: '${DB_USERNAME}'
MYSQL_ROOT_PASSWORD: '${DB_PASSWORD}'
MYSQL_DATABASE: '${DB_DATABASE}'
depends_on:
- mysql
networks:
- sail
redis:
image: 'redis:alpine'
container_name: MP-Communication-Service-Redis
ports:
- '${FORWARD_REDIS_PORT:-63791}:6379'
volumes:
- 'sailredis:/data'
networks:
- sail
healthcheck:
test: ["CMD", "redis-cli", "ping"]
retries: 3
timeout: 5s
networks:
sail:
driver: bridge
volumes:
sailmysql:
driver: local
sailredis:
driver: local

Answer 1

Notice: this solution is raw and for development time:
First get container gateway ip:
❯ docker inspect {container id} | grep -i Gateway
Second Suppose it gives you 172.25.0.1
Your url pattern will look like this:
http://{containerIp}:{port}/...
or:
http://172.25.0.1:8585/...
The port is the same as the one you put in your docker-compose.yaml file.