Docker fake localhost access for any LAN device - docker

Question

After many failed attemps I am asking here. Not a programming question per say but I believe relevant to the community.
I have been trying to access my docker-compose dev website from my phone on LAN like this https://lan_server_ip:8000 (for CSS checking) but I am running into all sorts of issues and would like to know if there is a simple proxy type solution that would allow me to access my development server from LAN.
main issue is that my symfony app only recognizes a single trusted ip 127.0.0.1 set within the app itself.
I need a solution without having to modify the symfony app since adding ips for devices is unpractical; especially with dynamic ip.
The idea would be to have an interface to connect to instead of main nginx that would make the website believe that all requests are coming from the host machine 127.0.0.1.
Or modify my nginx configuration with a new server or location ? I tried rewriting headers but no success so far.
At the moment using responsive design on browsers but it is far from accurate and up to date. My only real solution is to find issues from the production website.
I believe adding a new container to take care of this but how ?
my docker-compose.yaml
version: "3"
services:
nginx:
container_name: nginx
image: "${NGINX_IMAGE}"
build: build/nginx
restart: always
env_file: .env
ports:
- "8000:443"
volumes:
- "${APP_HOST_NGINX_CONF}:${APP_CONTAINER_NGINX_CONF}:ro"
- "${APP_HOST_CERTS}:${APP_CONTAINER_CERTS}"
- "${APP_HOST_DIR}/public:${APP_CONTAINER_DIR}/public:ro"
- "/etc/localtime:/etc/localtime:ro"
networks:
app_network:
depends_on:
- app
app:
container_name: app
image: "${APP_IMAGE}"
restart: always
build: build/app
env_file: .env
networks:
app_network:
volumes:
- type: bind
source: ${APP_HOST_DIR}
target: ${APP_CONTAINER_DIR}
- type: bind
source: ${PHP_INI}
target: /usr/local/etc/php/php.ini
- type: bind
source: /etc/localtime
target: /etc/localtime:ro
depends_on:
- database
database:
container_name: mariadb
image: "mariadb:${MARIADB_VERSION}"
restart: always
env_file: .env
volumes:
- "${SQL_INIT}:/docker-entrypoint-initdb.d"
- type: bind
source: ${MARIADB_DATA_DIR}
target: /var/lib/mysql
- type: bind
source: ${MARIADB_LOG_DIR}
target: /var/logs/mysql
- type: bind
source: ${MARIADB_CERTS_DIR}
target: /etc/certs/
- type: bind
source: /etc/localtime
target: /etc/localtime:ro
ports:
- "3306:3306"
networks:
app_network:
command: [
"mysqld",
"--character-set-server=utf8mb4",
"--collation-server=utf8mb4_general_ci",
"--require_secure_transport=OFF",
"--bind-address=0.0.0.0",
"--ssl-key=/etc/certs/server-key.pem",
"--ssl-cert=/etc/certs/server-cert.pem",
"--ssl-ca=/etc/certs/ca-cert.pem",
]
networks:
app_network:
nginx.conf
#./images/nginx/build/default.conf
server {
listen 80 default_server;
server_name _;
return 301 https://$host$request_uri;
}
server {
listen 443 ssl;
server_name 127.0.0.1;
ssl_certificate /etc/nginx/certs/dev.crt;
ssl_certificate_key /etc/nginx/certs/dev.key;
index index.php index.html;
root /var/www/app/public;
client_max_body_size 128M;
location / {
try_files $uri $uri/ /index.php?$query_string;
}
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass app:9000;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_path_info;
}
error_log /var/log/nginx/app.error.log;
access_log /var/log/nginx/app.access.log;
}

Answer 1

I am not an expert in Symphony and the trusted hosts mechanism you described
in your question comments but, if the actual problem is simulating that your requests are coming from 127.0.0.1, you could try configuring nginx to provide that value in the Host header when proxying your application.
Using FastCGI you could obtain the desired result including the following line within the location ~ \.php$ block in your nginx configuration:
fastcgi_param HTTP_HOST 127.0.0.1;
For example:
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass app:9000;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param HTTP_HOST 127.0.0.1;
}
Please, take my words with caution: as I said, I don't fully understand Symphony and I don't want to cause you any kind of problem.