Connect two wordpress containers with same NGINX docker - docker

Question

I use nginx in a docker to connect my two wordpress websites, which are dockerized too.
I can set up one website with the following settings:
In docker-compose.yml
nginx:
image: nginx:alpine
volumes:
- ./web_ndnb_prod/src:/var/www/html
- ./nginx/conf.d:/etc/nginx/conf.d:ro
depends_on:
- web_ndnb_test
- web_ndnb_prod
In my NGINX conf file located in /nginx/conf.d
server {
[...]
root /var/www/html/;
[...]
}
However to add a 2nd website, I try to change the root and the websites return a 404
In docker-compose.yml
nginx:
image: nginx:alpine
volumes:
- ./web_ndnb_prod/src:/var/www/web_ndnb_prod
- ./web_ndnb_test/src:/var/www/web_ndnb_test
- ./nginx/conf.d:/etc/nginx/conf.d:ro
depends_on:
- web_ndnb_test
- web_ndnb_prod
In one of the 2 NGINX conf files
server {
[...]
root /var/www/web_ndnb_prod/;
[...]
}
If I execute
sudo docker exec -ti nginx ls /var/www/web_ndnb_prod
It outputs the wordpress files correctly
Why does Nginx not find them?
Edit 1
The main nginx.conf file is
worker_processes auto;
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;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
#tcp_nopush on;
keepalive_timeout 65;
#gzip on;
include /etc/nginx/conf.d/*.conf;
}