Docker is always loading the wrong PHP version that I have setup in Dockerfile

I am currently learning Docker for a project and got a configuration to start on my PHP website that I intend to change. The problem is that even when I set up different versions in Dockerfile I get the same PHP version.

This is the output when I do the docker-compose up command. It keeps using the PHP version 7.0.33. That’s the version that it shows in the browser as well.

This is my docker-compose.yml file:

# tell docker what version of the docker-compose.yml were using
version: '3'
# define the network
networks:
  web-network:

# start the services section
services:
  # define the name of our service
  # corresponds to the "--name" parameter
  docker-php-cli:
    # define the directory where the build should happened,
    # i.e. where the Dockerfile of the service is located
    # all paths are relative to the location of docker-compose.yml
    build: 
      context: ./php-apache
    # reserve a tty - otherwise the container shuts down immediately
    # corresponds to the "-i" flag
    tty: true
    # mount the app directory of the host to /var/www in the container
    # corresponds to the "-v" option
    volumes:
      - ./app:/var/www
    # connect to the network
    # corresponds to the "--network" option
    networks:
      - web-network

  docker-nginx:
    build: 
      context: ./nginx
    # defines the port mapping
    # corresponds to the "-p" flag
    ports:
      - "8080:80"
    tty: true
    volumes:
      - ./app:/var/www
      - ./nginx/conf.d:/etc/nginx/conf.d
    networks:
      - web-network

  docker-php-fpm:
    build: 
      context: ./php-fpm
    tty: true
    volumes:
      - ./app:/var/www
    networks:
      - web-network

These are the Docker files: php-apache folder

FROM php:5.6-apache
RUN pecl install xdebug-2.6.0 
    && docker-php-ext-enable xdebug

php-fpm folder

FROM php:5.6-fpm
RUN pecl install xdebug-2.6.0 
    && docker-php-ext-enable xdebug

I would like to change it for PHP 5.6 but I couldn’t, then I tested with many other versions and it didn’t work.

I did try removing the RUN part from each Dockerfile.

Can someone help me with that?

Thank you!

Answer

You are using docker-compose up what that command does is, it’s start containers from previously build images(to see images on you local use docker image ls)

after changing Dockerfile what you need to do is run docker-compose down and up again with –build flag. docker-compose up --build

Relevant document https://docs.docker.com/compose/reference/up/