我用nginx和mysql编写了一个docker-compose.yml，用dockerfile编写了一个应用程序laravel。
我的docker-compose：

version: "3.7"
services:
  app_back:
    build:
  
      context: .
      dockerfile: Dockerfile
    image: dreamy_back   
    container_name: dreamy-back-app
    restart: unless-stopped
    working_dir: /var/www/
    volumes:
      - .:/var/www
    networks:
      - dreamy
  db:
    image: mysql
    container_name: dreamy-db
    restart: unless-stopped
    depends_on:
      - app_back
    environment:
      MYSQL_DATABASE: ${DB_DATABASE}
      MYSQL_ROOT_PASSWORD: 4ztgeU%
      MYSQL_PASSWORD: ${DB_PASSWORD}
      MYSQL_USER: ${DB_USERNAME}
    networks:
      - dreamy
  nginx:
    image: nginx:1.17-alpine
    container_name: dreamy-back-nginx
    restart: unless-stopped
    ports:
      - 8000:80
    volumes:
      - ./:/var/www
      - ./docker-compose/vhosts:/etc/nginx/conf.d
    networks:
      - dreamy
networks:
  dreamy:
    driver: bridge

我的一个laravel应用程序的dockerfile：
我在容器内执行composer安装。

FROM php:8.1-fpm
# Install system dependencies
RUN apt-get update && apt-get install -y \
    git \
    curl \
    libpng-dev \
    libonig-dev \
    libxml2-dev \
    zip \
    unzip

# Clear cache
RUN apt-get clean && rm -rf /var/lib/apt/lists/*

# Install PHP extensions
RUN docker-php-ext-install pdo_mysql mbstring exif pcntl bcmath gd

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

# Set working directory

WORKDIR /var/www

我的nginx配置文件：

server {
    listen 80;
    index index.php index.html;
    error_log  /var/log/nginx/error.log;
    access_log /var/log/nginx/access.log;
    root /var/www/public;
    location ~ \.php$ {
        try_files $uri =404;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass app_back:9000;
        fastcgi_index index.php;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param PATH_INFO $fastcgi_path_info;
    }
    location / {
        try_files $uri $uri/ /index.php?$query_string;
        gzip_static on;
    }
}

在我的笔记本电脑上，它的工作，但在我的vps服务器上，我得到一个错误500。
我的码头应该可以访问端口8000
My nginx logs