Styjun

I have 2 containers up and running.

i am logged in into one container say container A, I want to execute command x in container B from container A.

To elaborate,

My application has php, mysql and other tools in another container. When user clicks specific link on my php app, a specific command should run on the 3rd container.

My first Container's Dockerfile:

FROM php:7.1.2-apache
RUN docker-php-ext-install mysqli

RUN a2enmod rewrite
RUN /etc/init.d/apache2 restart

ADD . /var/www/html

My second container's Dockerfile:

FROM ubuntu:bionic
RUN apt-get update && apt-get upgrade -y
EXPOSE 5000

My docker-compose.yml file is

version: "2"

services:
 www:
 build: .
 container_name: Web
 ports:
 - "80:80"
 restart: always
 command: tail -f /dev/null
 volumes:
 - .:/var/www/html
 - /var/run/docker.sock:/var/run/docker.sock
 networks:
 internal:
 shared:
 ipv4_address: 172.55.0.5

 ubuntu:
 build:
 context: ./dockerFiles/ubuntu
 container_name: Radius
 ports:
 - "5000:5000"
 volumes:
 - ./dockerFiles/radius/ubuntu:/ubuntu
 restart: always
 networks:
 internal:
 shared:
 ipv4_address: 172.55.0.4

volumes:
 persistent:

networks:
 internal:
 driver_opts:
 internal: "true"
 driver: bridge
 shared:
 driver_opts:
 enable_ipv6: "true"
 driver: bridge
 ipam:
 config:
 - subnet: 172.55.0.0/16
 gateway: 172.55.0.1

Is this possible? If yes, can this be eloberated?

Many Thanks in Advance

I have tried docker-in-docker command, this doesn't seems stable and secure.

Expecting to run a command in another container which is linked to this and should be run through php if possible.

the most understandable and secure way to do this is by using the client- server pattern.

expose a port in your 3rd container Dockerfile, and set it to execute some script on request. this container is acting as the server in this episode.

from your php container, curl to that server every time you want the script to get executed:

$handle = curl_init();
curl_setopt($handle, CURLOPT_URL, $url);
$data = curl_exec($handle);
curl_close($handle);

the curl should point to the 3rd container name.

i would like to help in setting up the server-side listening on the 3rd container, just show the Dockerfile or docker-compose file it is built from.