Why is the nginx container not working correctly?

Question

Nginx

Hello. I have a docker-compose.yml with the following content:

version: '3'

services:
  rabbit:
    hostname: rabbit
    image: rabbitmq:3.6.1-management
    environment:
      RABBITMQ_DEFAULT_USER: admin
      RABBITMQ_DEFAULT_PASS: admin
    ports:
      - "5672:5672"
      - "15672:15672"
    healthcheck:
      test: [ "CMD", "pwd" ]
      timeout: 3s
      retries: 20
    networks:
      - internal
  php:
    build:
      dockerfile: Dockerfile
      context: ./
    volumes:
      - ./:/var/www/html
      - ./docker/conf/php/custom.ini:/usr/local/etc/php/conf.d/custom.ini
    depends_on:
      db:
        condition: service_healthy
      rabbit:
        condition: service_healthy
    environment:
      XDEBUG_CONFIG: client_host=host.docker.internal
      PHP_IDE_CONFIG: "serverName=Docker"
    networks:
      - internal
  db:
    image: mysql:latest
    environment:
      MYSQL_DATABASE: mailing
      MYSQL_ROOT_PASSWORD: root
      MYSQL_USER: user
      MYSQL_PASSWORD: user
    healthcheck:
      test: [ "CMD", "mysqladmin" ,"ping", "-h", "localhost" ]
      timeout: 3s
      retries: 20
    ports:
      - 3306:3306
    volumes:
      - ./database:/var/lib/mysql
    networks:
      - internal
  nginx:
    image: nginx:1.19.2-alpine
    ports:
      - 8000:80
    volumes:
      - ./:/var/www/html
      - ./docker/conf/nginx:/etc/nginx/conf.d
      - ./docker/nginx/logs:/var/log/nginx/
    links:
      - php
    networks:
      - internal
    depends_on:
      db:
        condition: service_healthy
networks:
  internal:
    driver: bridge
    ipam:
      driver: default

If I raise this whole thing, then when I access localhost: 8000 I see an error

502 Bad Gateway
connect() failed (111: Connection refused) while connecting to upstream, client: 172.23.0.1, server: , request: "GET / HTTP/1.1", upstream: "fastcgi://172.23.0.4:9000", host: "localhost:8000"

Moreover, static files such as image files, style files, etc. nginx returns correctly. It looks like it's in php.

But if I remove the depends_on section for the php container, then everything works correctly.
Tell me, please, how to solve this problem?
Thanks in advance to all who respond.

Answer 1

But if I remove the depends_on section for the php container, then everything works correctly.

I think something is wrong with the healthchecks. Maybe write something in the log?