How to redirect different subdomains to applications running on different ports with nginx - ssl

Question

I have 2 nodejs applications running in my EC2 instance at PORT 3000 and 1337. What I want to achieve is
admin.mydomain.com
should be redirected to the application running on PORT 1337 and
mydomain.com www.mydomain.com
should be redirected to the application running on PORT 3000.
With my current nginx configuration I am getting a 502
map $subdomain $subdomain_port {
default 3000;
www 3000;
admin 1337;
}
server {
listen 80;
listen [::]:80;
server_name _;
return 301 https://$server_name$request_uri;
}
server {
listen 443 ssl http2 default_server;
listen [::]:443 ssl http2 default_server;
server_name ~^(?P<subdomain>.+?)\.historydiaries\.com$;
location / {
proxy_pass http://localhost:$subdomain_port;
proxy_redirect off;
}
ssl_certificate /etc/letsencrypt/live/historydiaries.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/historydiaries.com/privkey.pem;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_ciphers EECDH+CHACHA20:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5;
ssl_session_cache shared:SSL:5m;
ssl_session_timeout 1h;
add_header Strict-Transport-Security “max-age=15768000” always;
}

Answer 1

You can achieve this using two different nginx conf

Answer 2

I will go with separate Nginx vhost configuration.
One for www.mydomain.com and another one for admin.mydomain.com
server {
listen 80;
server_name www.mydomain.com;
access_log /var/log/nginx/mydomain_access.log;
location / {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_pass http://localhost:3000/;
proxy_redirect off;
}
}
and
server {
listen 80;
server_name admin.mydomain.com;
access_log /var/log/nginx/admin.mydomain_access.log;
location / {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_pass http://localhost:1337/;
proxy_redirect off;
}
}
This just simple vhost configuration. You can add Let's Encrypt later when you need.