502 Bad Gateway Docker Symfony Nginx - php

Question

I have a problem with my docker configuration, my home page on localhost return always 502 Bad Gateway.
Here you can see the architecture of the projet :
https://i.stack.imgur.com/Bfc24.png
the four container running :
https://ibb.co/XpQvnXj
I can access to phpmyadmin :
https://ibb.co/FXLqg8B
But when I go to the nginx port I have this issue :
https://ibb.co/2vs72jF
And this is the contents of the files.
docker-compose.yml :
version: '3'
services:
php:
build:
context: ./php
ports:
- "9000:9000"
volumes:
- ../symfony:/var/www
nginx:
container_name: "nginx"
build:
context: ./nginx
volumes:
- ../symfony:/var/www
- ./nginx/nginx.conf:/etc/nginx/nginx.conf
- ./logs:/var/log
depends_on:
- php
ports:
- "8081:80"
db:
image: mysql:5.6
restart: always
environment:
MYSQL_ALLOW_EMPTY_PASSWORD: 'yes'
phpmyadmin:
image: phpmyadmin
restart: always
ports:
- 8080:80
environment:
PMA_HOST: db
depends_on:
- db
php/Dockerfile :
FROM php:8.0.3-fpm
RUN apt-get update \
&& apt-get install -y --no-install-recommends locales apt-utils git libicu-dev g++ libpng-dev libxml2-dev libzip-dev libonig-dev libxslt-dev;
RUN curl -LsS https://symfony.com/installer -o /usr/local/bin/symfony
RUN curl -sSk https://getcomposer.org/installer | php -- && \
mv composer.phar /usr/local/bin/composer
RUN docker-php-ext-configure intl
RUN docker-php-ext-install mysqli
RUN docker-php-ext-install pdo pdo_mysql gd opcache intl zip calendar dom mbstring zip gd xsl
RUN pecl install apcu && docker-php-ext-enable apcu
WORKDIR /var/www
CMD composer install ; php-fpm
EXPOSE 9000
nginx/Dockerfile :
FROM nginx:alpine
WORKDIR /var/www
CMD ["nginx"]
EXPOSE 80
nginx/nginx.conf :
user nginx;
worker_processes 4;
daemon off;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
access_log /var/log/nginx/access.log;
sendfile on;
keepalive_timeout 65;
upstream phpserver {
server php:9000;
}
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name localhost;
root /var/www/public;
index index.php index.html index.htm;
location / {
try_files $uri $uri/ /index.php$is_args$args;
}
location ~ \.php$ {
try_files $uri /index.php =404;
fastcgi_pass phpserver;
fastcgi_index index.php;
fastcgi_buffer_size 128k;
fastcgi_buffers 4 256k;
fastcgi_busy_buffers_size 256k;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_read_timeout 600;
include fastcgi_params;
}
location ~ /\.ht {
proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
deny all;
}
}
}
error.log :
2021/10/13 13:53:04 [error] 25#25: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.16.1, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://192.168.16.3:9000", host: "localhost:8081"
2021/10/13 13:53:04 [error] 25#25: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.16.1, server: localhost, request: "GET /favicon.ico HTTP/1.1", upstream: "fastcgi://192.168.16.3:9000", host: "localhost:8081", referrer: "http://localhost:8081/"
I'm new to Docker so the problem is probably obvious