Nginx config and ubuntu systemd services for hosting multiple game instances on ports 8001 through 8005, proxied from urls like wss://subdomain.domain.io/1 through wss://subdomain.domain.io/5; can also remove the ssl and listen on port 80 instead. The service file is an example, but creating 5 called instance1.service through instance5.service a…

default.conf

map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

server {
    listen 443 ssl;

    ssl_certificate /srv/certs/fullchain.pem;
    ssl_certificate_key /srv/certs/privkey.pem;

    location = /1 {
        proxy_pass http://127.0.0.1:8001;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
    }

    location = /2 {
        proxy_pass http://127.0.0.1:8002;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
    }

    location = /3 {
        proxy_pass http://127.0.0.1:8003;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
    }

    location = /4 {
        proxy_pass http://127.0.0.1:8004;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
    }

    location = /5 {
        proxy_pass http://127.0.0.1:8005;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
    }
    # etc if needed
}

instance1.service

[Unit]
Description=instance 1
After=network-online.target

[Service]
Environment=NODE_ENV=production
Type=simple
User=root
WorkingDirectory=/srv
ExecStart=/usr/bin/node ./srv/something.js --port 8001 --url 1
Restart=on-failure

[Install]
WantedBy=multi-user.target