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In this tutorial, we will learn how to install Composer inside a Docker container for your Laravel project. Composer is an important tool for PHP that helps to manage dependencies and packages easily.

We will go step by step and set up Docker with Laravel, Composer, and other required configurations. This will help you to run Laravel inside Docker without any manual setup.

Step 1: Create Laravel Project

laravel new my-app

Step 2: Create Dockerfile

Dockerfile

FROM php:8.3-fpm

WORKDIR /var/www/html

RUN apt-get update & apt-get install -y \
    libzip-dev \
    unzip \
    & docker-php-ext-install zip pdo_mysql

# Composer Install
COPY --from=composer:latest /usr/bin/composer /usr/bin/composer 

COPY . /var/www/html

# Composer Install for Laravel Project
RUN composer install

RUN chown -R www-data:www-data /var/www/html
RUN chown -R www-data:www-data /var/www/html/storage /var/www/html/bootstrap/cache /var/www/html/vendor
RUN chmod -R 775 /var/www/html/storage /var/www/html/bootstrap/cache /var/www/html/vendor

Step 3: Create NGINX Config File

.docker/apache/default.conf

server {
    listen 80;
    index index.php index.html;
    root /var/www/html/public;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location ~ \.php$ {
        include fastcgi_params;
        fastcgi_pass web:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_buffers 16 16k;
        fastcgi_buffer_size 32k;
    }

    location ~ /\.ht {
        deny all;
    }
}

Step 4: Create docker-compose.yml

docker-compose.yml

services:
  web:
    build:
      context: .
      dockerfile: Dockerfile
    image: my-laravel-app
    volumes:
      - .:/var/www/html
      - /var/www/html/storage
      - /var/www/html/bootstrap/cache
      - /var/www/html/vendor
    working_dir: /var/www/html
    user: "www-data"
    depends_on:
      - db

  nginx:
    image: nginx:latest
    ports:
      - "8080:80"
    volumes:  
      - .:/var/www/html
      - ./.docker/nginx/default.conf:/etc/nginx/conf.d/default.conf
    depends_on:
      - web
  
  db:
    image: mysql:8.0
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: laravel
      MYSQL_USER: laravel
      MYSQL_PASSWORD: secret
    ports:
      - "3307:3306"
    volumes:
      - dbdata:/var/lib/mysql

volumes:
  dbdata:

Run Laravel App:

All the required steps have been done, now you have to type the given below command and hit enter to run the Laravel app:

php artisan serve

Now, Go to your web browser, type the given URL and view the app output:

http://localhost:8080

Now you can use.