PHP socket connect socket_connect(): unable to connect [111 - php

Question

I have created below docker-composer yml file to create environment for connect php to socket server.
services:
websocket-server:
build: .
command: php -S 127.0.0.1:1000 -t /var/www/html/websocket
volumes:
- ./src:/var/www/html
ports:
- 1000:1000
php-tutorial:
build: .
volumes:
- ./src:/var/www/html
ports:
- 7000:80
My Dockerfile looks like
FROM php:8.0-apache
WORKDIR /var/www/html
RUN apt-get update -y && apt-get install -y telnet libmariadb-dev
RUN docker-php-ext-install mysqli sockets
After buid docker container, both container running well , in websocket-server I'm getting below log
[Fri Feb 3 05:12:43 2023] PHP 8.0.27 Development Server (http://127.0.0.1:1000) started
Now I have written a php code to connect socket
<?php
$socket = socket_create(AF_INET, SOCK_STREAM, 0);
if (socket_connect($socket, '127.0.0.1', 1000) === false) {
echo "Unable to connect to server\n";
exit;
}
socket_write($socket, "Hello, server!");
$response = socket_read($socket, 1024);
echo "Response from server: $response\n";
socket_close($socket);
After run in browser , I'm getting below Warning
Warning: socket_connect(): unable to connect [111]: Connection refused in /var/www/html/index.php on line 4
Unable to connect to server
I am unable to find the solution.

Answer 1

You need to connect two containers to same network, forward port is just connect container port your host machine, it won't help you connect each containers, so your php container can touch socket container.
Read document: https://docs.docker.com/network/
I'm not sure if this example work, but you can try it:
services:
websocket-server:
build: .
command: php -S 127.0.0.1:1000 -t /var/www/html/websocket
volumes:
- ./src:/var/www/html
ports:
- 1000:1000
networks:
- dev
php-tutorial:
build: .
volumes:
- ./src:/var/www/html
ports:
- 7000:80
networks:
- dev
networks:
dev:
driver: bridge
And even if you connect to same network, you still need to change your code:
if (socket_connect($socket, '127.0.0.1', 1000) === false)
// change to below
if (socket_connect($socket, 'websocket-server', 1000) === false)