3

First of all, please forgive me if any information is missing or if my question does not meet the standards required by the site. I have very basic knowledge of docker, linux and networking and I am lost.

I use Ubuntu version 20.2 and I have docker version 20.10.10.

I have a system (CakePHP) running in a docker container, and an API (LARAVEL) running on my machine's local host (outside of the docker container), and I need to consume that API on the system from inside the docker container.

This is the content of docker-compose.yml

version: '2'
services:
  server-c10-php56:
    build:
      context: .
      dockerfile: Dockerfile
    image: php-c10-56
    volumes:
      - /srv/:/srv/
      - /var/www/html/:/var/www/html/
    ports:
      - "9056:80"
      - "9443:443"
    networks:
      - net30
    container_name: "docker-php56"
networks:
  sdnet:
    driver: "bridge"
  net30:
    ipam:
      driver: default
      config:
        - subnet: 172.30.0.0/16

As I understand it, the system (CakePHP) is running inside this 172.30.0.0/16 subnet. And the system (CakePHP) to connect to PostgreSQL, connects through IP 172.30.0.1 (I think it's the gateway to access the local host of my machine).

The API I can consume normally by Postman. Here is a screenshot of a test. inserir a descrição da imagem aqui

And on the system (CakePHP) from inside the docker container, I'm trying to consume like this (just testing for now). inserir a descrição da imagem aqui

It takes a while trying to connect, but without success. This is the return obtained ( sorry for the array format).

Array
(
    [response] => 
    [info] => Array
        (
            [url] => http://172.30.0.1:8000/api/queue/integracaoEcommerce
            [content_type] => 
            [http_code] => 0
            [header_size] => 0
            [request_size] => 0
            [filetime] => -1
            [ssl_verify_result] => 0
            [redirect_count] => 0
            [total_time] => 130.124754
            [namelookup_time] => 1.8E-5
            [connect_time] => 0
            [pretransfer_time] => 0
            [size_upload] => 0
            [size_download] => 0
            [speed_download] => 0
            [speed_upload] => 0
            [download_content_length] => -1
            [upload_content_length] => -1
            [starttransfer_time] => 0
            [redirect_time] => 0
            [redirect_url] => 
            [primary_ip] => 172.30.0.1
            [certinfo] => Array
                (
                )

            [primary_port] => 8000
            [local_ip] => 
            [local_port] => 0
        )
)

Here is the method used to consume the API (in case that information is important).

private function callAPI($options){
        extract($options);

        $ch = curl_init();

        $header = array(
            "Content-Type: application/json",
            "Authentication: bearer {$integrador['token']}"
        );

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_HEADER, FALSE);

        if(!empty($data) OR $verb == 'POST'){
            curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
            curl_setopt($ch, CURLOPT_POST, TRUE);    
        }

        if($verb)
            curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $verb);

        curl_setopt($ch, CURLOPT_HTTPHEADER, $header);

        $response = curl_exec($ch);
        $info = curl_getinfo($ch);
        curl_close($ch);

        return array('response' => $response, 'info' => $info);
    }

1 Answer 1

2

I'm not sure I can help you, but this might :

https://stackoverflow.com/questions/24319662/from-inside-of-a-docker-container-how-do-i-connect-to-the-localhost-of-the-mach

tldr (bridge mode):

to get the ip of the container (in container CLI) : ip addr show eth0

to get the ip of the host's docker interface (host CLI) : sudo ip addr show docker0

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