[LINUX] NGINX WEBSOCKET LOADBALANCER - fourslickz/notes GitHub Wiki

upstream websocket_backend {
    least_conn;
    server 172.17.0.2:3000;
    server 172.17.0.3:3000;
    server 172.17.0.4:3000;
}

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

server {
    listen 80;
    server_name _;

    location / {
        proxy_pass http://websocket_backend;

        # WebSocket headers
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;

        # Pass real client info
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_read_timeout 3600s;
        proxy_send_timeout 3600s;
    }
}